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[nazev] => Development and experimental validation of self-powered wireless vibration sensor node using vibration energy harvester
[nazev_orig] => Development and experimental validation of self-powered wireless vibration sensor node using vibration energy harvester
[duvernost_udaju_id] => S
[popis] => This paper deals with development of a self-powered solution for wireless vibration sens -ing. An autonomous operation of the proposed vibration sensor node is based on an elec-tromagnetic energy harvesting device which converts kinetic energy of ambient mechanical vibration. Moreover, mechanical vibrations are monitored via electric signal from a piezoelectric patch and the measured signal is transmitted to the monitoring unit. The electromagnetic energy harvester is designed to provide enough power for a signal processing unit and a communication module, enabling the system to operate as a self-powered wireless vibration sensor node. Operation of this system was experimentally val-idated in laboratory environment and examples of vibration monitoring are presented. There is a significant restriction in terms of operation in resonance regime, where the gen-erated power of the kinetic energy harvester is maximal and sufficient for limitless opera-tion of the node. Main aim of this paper is to present a complex system which could be used in many engineering applications, such as aerospace, transportation, or civil structure monitoring. (c) 2021 Elsevier Ltd. All rights reserved.
[popis_orig] => This paper deals with development of a self-powered solution for wireless vibration sens -ing. An autonomous operation of the proposed vibration sensor node is based on an elec-tromagnetic energy harvesting device which converts kinetic energy of ambient mechanical vibration. Moreover, mechanical vibrations are monitored via electric signal from a piezoelectric patch and the measured signal is transmitted to the monitoring unit. The electromagnetic energy harvester is designed to provide enough power for a signal processing unit and a communication module, enabling the system to operate as a self-powered wireless vibration sensor node. Operation of this system was experimentally val-idated in laboratory environment and examples of vibration monitoring are presented. There is a significant restriction in terms of operation in resonance regime, where the gen-erated power of the kinetic energy harvester is maximal and sufficient for limitless opera-tion of the node. Main aim of this paper is to present a complex system which could be used in many engineering applications, such as aerospace, transportation, or civil structure monitoring. (c) 2021 Elsevier Ltd. All rights reserved.
[klicova_slova] => Vibrations; Energy harvesting; Electromagnetic; Piezoelectric; MFC; Sensing; Wireless node
[klicova_slova_orig] => Vibrations; Energy harvesting; Electromagnetic; Piezoelectric; MFC; Sensing; Wireless node
[url] => https://www.sciencedirect.com/science/article/pii/S0888327021002855?via%3Dihub
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[citace_text] => RUBEŠ, O.; CHALUPA, J.; KŠICA, F.; HADAŠ, Z. Development and experimental validation of self-powered wireless vibration sensor node using vibration energy harvester. MECHANICAL SYSTEMS AND SIGNAL PROCESSING, 2021, vol. 160, no. 107890, p. 1-15. ISSN: 0888-3270.
[citace_html] => RUBEŠ, O.; CHALUPA, J.; KŠICA, F.; HADAŠ, Z. Development and experimental validation of self-powered wireless vibration sensor node using vibration energy harvester. MECHANICAL SYSTEMS AND SIGNAL PROCESSING, 2021, vol. 160, no. 107890, p. 1-15. ISSN: 0888-3270.
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author="Ondřej {Rubeš} and Jan {Chalupa} and Filip {Kšica} and Zdeněk {Hadaš}",
title="Development and experimental validation of self-powered wireless vibration sensor node using vibration energy harvester",
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year="2021",
volume="160",
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[nazev_en] => Development and experimental validation of self-powered wireless vibration sensor node using vibration energy harvester
[popis_en] => This paper deals with development of a self-powered solution for wireless vibration sens -ing. An autonomous operation of the proposed vibration sensor node is based on an elec-tromagnetic energy harvesting device which converts kinetic energy of ambient mechanical vibration. Moreover, mechanical vibrations are monitored via electric signal from a piezoelectric patch and the measured signal is transmitted to the monitoring unit. The electromagnetic energy harvester is designed to provide enough power for a signal processing unit and a communication module, enabling the system to operate as a self-powered wireless vibration sensor node. Operation of this system was experimentally val-idated in laboratory environment and examples of vibration monitoring are presented. There is a significant restriction in terms of operation in resonance regime, where the gen-erated power of the kinetic energy harvester is maximal and sufficient for limitless opera-tion of the node. Main aim of this paper is to present a complex system which could be used in many engineering applications, such as aerospace, transportation, or civil structure monitoring. (c) 2021 Elsevier Ltd. All rights reserved.
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[nazev] => Orthotropic elastic–plastic–damage model of beech wood based on split Hopkinson pressure and tensile bar experiments
[nazev_orig] => Orthotropic elastic–plastic–damage model of beech wood based on split Hopkinson pressure and tensile bar experiments
[duvernost_udaju_id] => S
[popis] => The hardwood is a natural composite, which finds applications in many fields such as an important building material. Attention was paid to the accurate description of the European beech wood under high strain rates in order to constitute a reliable input for the finite element method. It was done on the basis of split Hopkinson tensile bar tests, taking also into consideration the previously reported pressure bar tests to capture the tensile–compressive failure asymmetry, which was incorporated through the stress triaxiality. Strains measured on the steel bars for specimens oriented in all principal loading directions were used to calibrate the fully orthotropic behaviour of elasticity, plasticity and fracture. The concept of continuum damage mechanics was applied to the damage accumulation in order to simulate the crack propagation within explicit finite elements realistically.
[popis_orig] => The hardwood is a natural composite, which finds applications in many fields such as an important building material. Attention was paid to the accurate description of the European beech wood under high strain rates in order to constitute a reliable input for the finite element method. It was done on the basis of split Hopkinson tensile bar tests, taking also into consideration the previously reported pressure bar tests to capture the tensile–compressive failure asymmetry, which was incorporated through the stress triaxiality. Strains measured on the steel bars for specimens oriented in all principal loading directions were used to calibrate the fully orthotropic behaviour of elasticity, plasticity and fracture. The concept of continuum damage mechanics was applied to the damage accumulation in order to simulate the crack propagation within explicit finite elements realistically.
[klicova_slova] => Dynamics; Elastic stress wave; Kolsky bar; Shock; Impact
[klicova_slova_orig] => Dynamics; Elastic stress wave; Kolsky bar; Shock; Impact
[url] => https://www.sciencedirect.com/science/article/pii/S0734743X21001627
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[originalni_jazyk] => en
[schvalil_id] => 107598
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[citace_text] => ŠEBEK, F.; KUBÍK, P.; TIPPNER, J.; BRABEC, M. Orthotropic elastic–plastic–damage model of beech wood based on split Hopkinson pressure and tensile bar experiments. International journal of impact engineering, 2021, vol. 157, no. 1, p. 1-13. ISSN: 0734-743X.
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title="Orthotropic elastic–plastic–damage model of beech wood based on split Hopkinson pressure and tensile bar experiments",
journal="International journal of impact engineering",
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url="https://www.sciencedirect.com/science/article/pii/S0734743X21001627"
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[nazev_en] => Orthotropic elastic–plastic–damage model of beech wood based on split Hopkinson pressure and tensile bar experiments
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[nazev] => Beneficial osseointegration effect of hydroxyapatite coating on cranial implant - FEM investigation
[nazev_orig] => Beneficial osseointegration effect of hydroxyapatite coating on cranial implant - FEM investigation
[duvernost_udaju_id] => S
[popis] => A firm connection of the bone-implant-fixation system is of utmost importance for patients with cranial defects. In order to improve the connection reliability, the current research focuses on finding the optimal fixation method, as well as selection of the implant manufacturing methods and the used materials. For the latter, implementation of bioactive materials such as hydroxyapatite or other calcium phosphates has also been considered in the literature. The aim of this study was to investigate the effect of gradual osseointegration on the biomechanical performance of cranial Ti6Al4V implants with a deposited HA coating as the osseointegration agent. This effect was assessed by two different computational approaches using finite element method (FEM) modeling. The values of key input parameters necessary for FEM were obtained from experimental plasma spray deposition of HA layers onto Ti6Al4V samples. Immediately upon implantation, the HA layer at the bone-implant contact area brought only a slight decrease in the values of von Mises stress in the implant and the micro-screws when compared to a non-coated counterpart; importantly, this was without any negative trade-off in other important characteristics. The major benefit of the HA coatings was manifested upon the modeled osseointegration: the results of both approaches confirmed a significant reduction of investigated parameters such as the total implant displacements (reduced from 0.050 mm to 0.012 mm and 0.002 mm while using Approach I and II, respectively) and stresses (reduced from 52 MPa to 10 MPa and 1 MPa) in the implanted components in comparison to non-coated variant. This is a very promising result for potential use of thermally sprayed HA coatings for cranial implants.
[popis_orig] => A firm connection of the bone-implant-fixation system is of utmost importance for patients with cranial defects. In order to improve the connection reliability, the current research focuses on finding the optimal fixation method, as well as selection of the implant manufacturing methods and the used materials. For the latter, implementation of bioactive materials such as hydroxyapatite or other calcium phosphates has also been considered in the literature. The aim of this study was to investigate the effect of gradual osseointegration on the biomechanical performance of cranial Ti6Al4V implants with a deposited HA coating as the osseointegration agent. This effect was assessed by two different computational approaches using finite element method (FEM) modeling. The values of key input parameters necessary for FEM were obtained from experimental plasma spray deposition of HA layers onto Ti6Al4V samples. Immediately upon implantation, the HA layer at the bone-implant contact area brought only a slight decrease in the values of von Mises stress in the implant and the micro-screws when compared to a non-coated counterpart; importantly, this was without any negative trade-off in other important characteristics. The major benefit of the HA coatings was manifested upon the modeled osseointegration: the results of both approaches confirmed a significant reduction of investigated parameters such as the total implant displacements (reduced from 0.050 mm to 0.012 mm and 0.002 mm while using Approach I and II, respectively) and stresses (reduced from 52 MPa to 10 MPa and 1 MPa) in the implanted components in comparison to non-coated variant. This is a very promising result for potential use of thermally sprayed HA coatings for cranial implants.
[klicova_slova] => Mechanical properties; Heat treatment
[klicova_slova_orig] => Mechanical properties; Heat treatment
[url] => https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0254837
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[citace_text] => CHAMRAD, J.; MARCIÁN, P.; ČÍŽEK, J. Beneficial osseointegration effect of hydroxyapatite coating on cranial implant - FEM investigation. PLoS One, 2021, vol. 16, no. 7, p. e0254837 (e0254837 p.)ISSN: 1932-6203.
[citace_html] => CHAMRAD, J.; MARCIÁN, P.; ČÍŽEK, J. Beneficial osseointegration effect of hydroxyapatite coating on cranial implant - FEM investigation. PLoS One, 2021, vol. 16, no. 7, p. e0254837 (e0254837 p.)ISSN: 1932-6203.
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[nazev_en] => Beneficial osseointegration effect of hydroxyapatite coating on cranial implant - FEM investigation
[popis_en] => A firm connection of the bone-implant-fixation system is of utmost importance for patients with cranial defects. In order to improve the connection reliability, the current research focuses on finding the optimal fixation method, as well as selection of the implant manufacturing methods and the used materials. For the latter, implementation of bioactive materials such as hydroxyapatite or other calcium phosphates has also been considered in the literature. The aim of this study was to investigate the effect of gradual osseointegration on the biomechanical performance of cranial Ti6Al4V implants with a deposited HA coating as the osseointegration agent. This effect was assessed by two different computational approaches using finite element method (FEM) modeling. The values of key input parameters necessary for FEM were obtained from experimental plasma spray deposition of HA layers onto Ti6Al4V samples. Immediately upon implantation, the HA layer at the bone-implant contact area brought only a slight decrease in the values of von Mises stress in the implant and the micro-screws when compared to a non-coated counterpart; importantly, this was without any negative trade-off in other important characteristics. The major benefit of the HA coatings was manifested upon the modeled osseointegration: the results of both approaches confirmed a significant reduction of investigated parameters such as the total implant displacements (reduced from 0.050 mm to 0.012 mm and 0.002 mm while using Approach I and II, respectively) and stresses (reduced from 52 MPa to 10 MPa and 1 MPa) in the implanted components in comparison to non-coated variant. This is a very promising result for potential use of thermally sprayed HA coatings for cranial implants.
[klicova_slova_en] => Mechanical properties; Heat treatment
[vysledek_datum] => 2021-07-19T00:00:00+02:00
)
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(
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[nazev] => 3D assessment of surface influence on crack initiation in sharp notches under a mixed mode of loading
[nazev_orig] => 3D assessment of surface influence on crack initiation in sharp notches under a mixed mode of loading
[duvernost_udaju_id] => S
[popis] => Sharp notches occur in constructions and lead to stress concentrations. Thus they are dangerous points of constructions and must be properly evaluated. In the present study the effect of a free surface on crack initiation conditions is observed and evaluated by means of a 3D model of a specimen with a sharp notch and by means of the finite fracture mechanics of general singular stress concentrators (GSSCs). The effect of a free surface on crack propagation and the crack front shape is described in many publications (Hutar? et al., 2010; He et al., 2016; Oplt et al., 2019). Concerning GSSCs (sharp notches, bi-material notches, sharp material inclusions, etc.) crack initiation conditions can also be influenced by the presence of the free surface. In our study we suppose the case of a sharp notch in a homogeneous material with a straight notch front perpendicular to the free surface. In this case a crack can be initiated either from the central region of the notch front or at the vertex point (the point where the notch front intersects the free surface). In order to assess the crack initiation conditions in the 3D model, the critical quantity criterion is employed (Klus?ak et al., 2019). This criterion can be easily used with the knowledge of basic material parameters and with the use of results of finite element calculations of the assessed notch. It is shown that the place of crack initiation depends on the direction of external loading and thus on a mixity of normal and shear modes of loading. A comparison of results of 2D and 3D models is discussed.
[popis_orig] => Sharp notches occur in constructions and lead to stress concentrations. Thus they are dangerous points of constructions and must be properly evaluated. In the present study the effect of a free surface on crack initiation conditions is observed and evaluated by means of a 3D model of a specimen with a sharp notch and by means of the finite fracture mechanics of general singular stress concentrators (GSSCs). The effect of a free surface on crack propagation and the crack front shape is described in many publications (Hutar? et al., 2010; He et al., 2016; Oplt et al., 2019). Concerning GSSCs (sharp notches, bi-material notches, sharp material inclusions, etc.) crack initiation conditions can also be influenced by the presence of the free surface. In our study we suppose the case of a sharp notch in a homogeneous material with a straight notch front perpendicular to the free surface. In this case a crack can be initiated either from the central region of the notch front or at the vertex point (the point where the notch front intersects the free surface). In order to assess the crack initiation conditions in the 3D model, the critical quantity criterion is employed (Klus?ak et al., 2019). This criterion can be easily used with the knowledge of basic material parameters and with the use of results of finite element calculations of the assessed notch. It is shown that the place of crack initiation depends on the direction of external loading and thus on a mixity of normal and shear modes of loading. A comparison of results of 2D and 3D models is discussed.
[klicova_slova] => Crack initiation; Critical quantity criterion; Finite fracture mechanics; Vertex singularity
[klicova_slova_orig] => Crack initiation; Critical quantity criterion; Finite fracture mechanics; Vertex singularity
[url] => https://www.sciencedirect.com/science/article/pii/S0167844221000288?via%3Dihub
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[citace_text] => KLUSÁK, J.; KOPP, D. 3D assessment of surface influence on crack initiation in sharp notches under a mixed mode of loading. THEORETICAL AND APPLIED FRACTURE MECHANICS, 2021, vol. 112, no. 1, p. 1-11. ISSN: 0167-8442.
[citace_html] => KLUSÁK, J.; KOPP, D. 3D assessment of surface influence on crack initiation in sharp notches under a mixed mode of loading. THEORETICAL AND APPLIED FRACTURE MECHANICS, 2021, vol. 112, no. 1, p. 1-11. ISSN: 0167-8442.
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journal="THEORETICAL AND APPLIED FRACTURE MECHANICS",
year="2021",
volume="112",
number="1",
pages="1--11",
doi="10.1016/j.tafmec.2021.102920",
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[nazev_en] => 3D assessment of surface influence on crack initiation in sharp notches under a mixed mode of loading
[popis_en] => Sharp notches occur in constructions and lead to stress concentrations. Thus they are dangerous points of constructions and must be properly evaluated. In the present study the effect of a free surface on crack initiation conditions is observed and evaluated by means of a 3D model of a specimen with a sharp notch and by means of the finite fracture mechanics of general singular stress concentrators (GSSCs). The effect of a free surface on crack propagation and the crack front shape is described in many publications (Hutar? et al., 2010; He et al., 2016; Oplt et al., 2019). Concerning GSSCs (sharp notches, bi-material notches, sharp material inclusions, etc.) crack initiation conditions can also be influenced by the presence of the free surface. In our study we suppose the case of a sharp notch in a homogeneous material with a straight notch front perpendicular to the free surface. In this case a crack can be initiated either from the central region of the notch front or at the vertex point (the point where the notch front intersects the free surface). In order to assess the crack initiation conditions in the 3D model, the critical quantity criterion is employed (Klus?ak et al., 2019). This criterion can be easily used with the knowledge of basic material parameters and with the use of results of finite element calculations of the assessed notch. It is shown that the place of crack initiation depends on the direction of external loading and thus on a mixity of normal and shear modes of loading. A comparison of results of 2D and 3D models is discussed.
[klicova_slova_en] => Crack initiation; Critical quantity criterion; Finite fracture mechanics; Vertex singularity
[vysledek_datum] => 2021-04-01T00:00:00+02:00
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[4] => Array
(
[vysledek_id] => 172355
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[nazev] => The role of the surface in crack initiation in sharp and bi-material notches
[nazev_orig] => The role of the surface in crack initiation in sharp and bi-material notches
[duvernost_udaju_id] => S
[popis] => Sharp and bi-material notches occur in engineering components. Sharp notches are induced by requirements on a shape of components and structures. Bi-material notches are often related with components for electrical equipment (wire-insulator connection), or in civil engineering (steel-concrete junction). In the contribution, stress state is studied in vicinity of the notch tip. The stress is monitored along the notch front in order to describe the influence of free surface. Based on the stress distribution, crack initiation conditions can be estimated. Particularly, by means of 3D mod-els, we have studied whether a crack initiates in the middle of the specimen or near the free sur-face. Figure 1 shows geometry of sharp and bi-material notch. In the case of homogeneous notch, materials 1 and 2 are considered to be equal.
[popis_orig] => Sharp and bi-material notches occur in engineering components. Sharp notches are induced by requirements on a shape of components and structures. Bi-material notches are often related with components for electrical equipment (wire-insulator connection), or in civil engineering (steel-concrete junction). In the contribution, stress state is studied in vicinity of the notch tip. The stress is monitored along the notch front in order to describe the influence of free surface. Based on the stress distribution, crack initiation conditions can be estimated. Particularly, by means of 3D mod-els, we have studied whether a crack initiates in the middle of the specimen or near the free sur-face. Figure 1 shows geometry of sharp and bi-material notch. In the case of homogeneous notch, materials 1 and 2 are considered to be equal.
[klicova_slova] => Crack initiation, Stability of notches, The surface influence, Generalized fracture mechanics
[klicova_slova_orig] => Crack initiation, Stability of notches, The surface influence, Generalized fracture mechanics
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[citace_text] => KLUSÁK, J.; KOPP, D. The role of the surface in crack initiation in sharp and bi-material notches. 2021.
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author="Jan {Klusák} and Dalibor {Kopp}",
title="The role of the surface in crack initiation in sharp and bi-material notches",
year="2021",
note="Abstract"
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[nazev_en] => The role of the surface in crack initiation in sharp and bi-material notches
[popis_en] => Sharp and bi-material notches occur in engineering components. Sharp notches are induced by requirements on a shape of components and structures. Bi-material notches are often related with components for electrical equipment (wire-insulator connection), or in civil engineering (steel-concrete junction). In the contribution, stress state is studied in vicinity of the notch tip. The stress is monitored along the notch front in order to describe the influence of free surface. Based on the stress distribution, crack initiation conditions can be estimated. Particularly, by means of 3D mod-els, we have studied whether a crack initiates in the middle of the specimen or near the free sur-face. Figure 1 shows geometry of sharp and bi-material notch. In the case of homogeneous notch, materials 1 and 2 are considered to be equal.
[klicova_slova_en] => Crack initiation, Stability of notches, The surface influence, Generalized fracture mechanics
[vysledek_datum] => 2021-08-31T00:00:00+02:00
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(
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[nazev] => Influence of Turbulence in Aorta-like Tube: Computational and Experimental Study
[nazev_orig] => Influence of Turbulence in Aorta-like Tube: Computational and Experimental Study
[duvernost_udaju_id] => S
[popis] => The presented paper aims at comparison of modelling approaches to a pulsatile fluid flow in aorta-like tube; it investigates their influence on the shape of the velocity profiles and waveforms, and consequently on wall shear stress. Comparisons of computational results between rigid and compliant tubes with laminar and low Re turbulent models of fluid are presented. The results were validated with PIV experimental data through the velocity profile in the half-length section of the tube for both cases (rigid and compliant) and the overall agreement was very good, almost perfect for the rigid case. Frequency of the pulse pump in the experimental circuit was 1Hz, the diameter of the tube similar to 20 mm, and maximum deformation of the compliant tube during a period was 12%. The turbulent model improved the agreement with the experimental data by flattening the velocity profiles in both cases, but the effect was much more pronounced for the compliant tube, especially during the deceleration phase. This work confirms the hypothesis stated by Brindise and Vlachos (2018) that a longer deceleration phase triggers transition to turbulence. We put foundations for extension of this hypothesis to compliant tubes where this conclusion was confirmed for physiological Reynolds and Womersley numbers. The main outputs of this study are: (i) the length of deceleration phase should be considered (in addition to the geometry or severity of stenosis) in decision whether fluid simulations should be performed with or without laminar flow assumption; (ii) for fluid simulations of blood vessels considering their compliance, a special care should be devoted to time synchronization between BCs to prevent unphysiological waveforms.
[popis_orig] => The presented paper aims at comparison of modelling approaches to a pulsatile fluid flow in aorta-like tube; it investigates their influence on the shape of the velocity profiles and waveforms, and consequently on wall shear stress. Comparisons of computational results between rigid and compliant tubes with laminar and low Re turbulent models of fluid are presented. The results were validated with PIV experimental data through the velocity profile in the half-length section of the tube for both cases (rigid and compliant) and the overall agreement was very good, almost perfect for the rigid case. Frequency of the pulse pump in the experimental circuit was 1Hz, the diameter of the tube similar to 20 mm, and maximum deformation of the compliant tube during a period was 12%. The turbulent model improved the agreement with the experimental data by flattening the velocity profiles in both cases, but the effect was much more pronounced for the compliant tube, especially during the deceleration phase. This work confirms the hypothesis stated by Brindise and Vlachos (2018) that a longer deceleration phase triggers transition to turbulence. We put foundations for extension of this hypothesis to compliant tubes where this conclusion was confirmed for physiological Reynolds and Womersley numbers. The main outputs of this study are: (i) the length of deceleration phase should be considered (in addition to the geometry or severity of stenosis) in decision whether fluid simulations should be performed with or without laminar flow assumption; (ii) for fluid simulations of blood vessels considering their compliance, a special care should be devoted to time synchronization between BCs to prevent unphysiological waveforms.
[klicova_slova] => Pulsatile flow; Pulse wave velocity; Compliant tube; Low Re turbulent model; Boundary condition
[klicova_slova_orig] => Pulsatile flow; Pulse wave velocity; Compliant tube; Low Re turbulent model; Boundary condition
[url] => https://jafmonline.net/JournalArchive/download?file_ID=56401&issue_ID=1014
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[vycet_osob] => JAGOŠ, J.; KOHÚT, J.; KOTEK, M.; SKÁCEL, P.; BURŠA, J.
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[citace_text] => JAGOŠ, J.; KOHÚT, J.; KOTEK, M.; SKÁCEL, P.; BURŠA, J. Influence of Turbulence in Aorta-like Tube: Computational and Experimental Study. Journal of Applied Fluid Mechanics, 2021, vol. 14, no. 5, p. 1411-1420. ISSN: 1735-3645.
[citace_html] => JAGOŠ, J.; KOHÚT, J.; KOTEK, M.; SKÁCEL, P.; BURŠA, J. Influence of Turbulence in Aorta-like Tube: Computational and Experimental Study. Journal of Applied Fluid Mechanics, 2021, vol. 14, no. 5, p. 1411-1420. ISSN: 1735-3645.
[citace_rtf] =>
[citace_bibtex] => @article{BUT172470,
author="Jiří {Jagoš} and Jiří {Kohút} and Michal {Kotek} and Pavel {Skácel} and Jiří {Burša}",
title="Influence of Turbulence in Aorta-like Tube: Computational and Experimental Study",
journal="Journal of Applied Fluid Mechanics",
year="2021",
volume="14",
number="5",
pages="1411--1420",
doi="10.47176/jafm.14.05.32291",
issn="1735-3572",
url="https://jafmonline.net/JournalArchive/download?file_ID=56401&issue_ID=1014"
}
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[oecd_tree_podobor_id] => 20302
[oecd_tree_podobor_nazev] => Applied mechanics
[poznamka_metriky] =>
[nazev_en] => Influence of Turbulence in Aorta-like Tube: Computational and Experimental Study
[popis_en] => The presented paper aims at comparison of modelling approaches to a pulsatile fluid flow in aorta-like tube; it investigates their influence on the shape of the velocity profiles and waveforms, and consequently on wall shear stress. Comparisons of computational results between rigid and compliant tubes with laminar and low Re turbulent models of fluid are presented. The results were validated with PIV experimental data through the velocity profile in the half-length section of the tube for both cases (rigid and compliant) and the overall agreement was very good, almost perfect for the rigid case. Frequency of the pulse pump in the experimental circuit was 1Hz, the diameter of the tube similar to 20 mm, and maximum deformation of the compliant tube during a period was 12%. The turbulent model improved the agreement with the experimental data by flattening the velocity profiles in both cases, but the effect was much more pronounced for the compliant tube, especially during the deceleration phase. This work confirms the hypothesis stated by Brindise and Vlachos (2018) that a longer deceleration phase triggers transition to turbulence. We put foundations for extension of this hypothesis to compliant tubes where this conclusion was confirmed for physiological Reynolds and Womersley numbers. The main outputs of this study are: (i) the length of deceleration phase should be considered (in addition to the geometry or severity of stenosis) in decision whether fluid simulations should be performed with or without laminar flow assumption; (ii) for fluid simulations of blood vessels considering their compliance, a special care should be devoted to time synchronization between BCs to prevent unphysiological waveforms.
[klicova_slova_en] => Pulsatile flow; Pulse wave velocity; Compliant tube; Low Re turbulent model; Boundary condition
[vysledek_datum] => 2021-09-01T00:00:00+02:00
)
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(
[vysledek_id] => 172474
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[nazev] => Determination of Residual Stresses in Cylindrical Components by the Hole-drilling Method
[nazev_orig] => Determination of Residual Stresses in Cylindrical Components by the Hole-drilling Method
[duvernost_udaju_id] => S
[popis] => Background The hole-drilling method is a widely used technique for the determination of residual stresses, but the application of the method requires a planar surface of the measured component. Objective Since many components have a cylindrical surface in industrial practice, this study focuses on the determination of residual stresses in cylindrical components. Methods Several cylindrical bodies with various residual stress states were simulated and the method described in ASTM E837 standard was used for the evaluation process. In order to properly simulate the required residual stress states in cylindrical bodies, a new approach for the application of load into the finite element models of hole-drilling experiment is presented. Furthermore, a new procedure with four sets of calibration coefficients is proposed to determine the uniform residual stresses in cylindrical bodies. Results Based on the obtained results, the factors affecting the evaluation are identified and the errors of residual stresses evaluated by ASTM E837 standard are quantified for several cylindrical bodies. Moreover, the testing of the procedure with four sets of calibration coefficients shows a negligible relative error of the evaluated residual stresses even for cylindrical bodies with a small radius. Conclusions It can be stated that the proposed procedure significantly improves the evaluation of the uniform residual stresses in cylindrical bodies. The results of this study can also be used to estimate an error in practical measurements or to determine the radius of a cylindrical body, which is still acceptable when the residual stresses are evaluated by ASTM E837 standard.
[popis_orig] => Background The hole-drilling method is a widely used technique for the determination of residual stresses, but the application of the method requires a planar surface of the measured component. Objective Since many components have a cylindrical surface in industrial practice, this study focuses on the determination of residual stresses in cylindrical components. Methods Several cylindrical bodies with various residual stress states were simulated and the method described in ASTM E837 standard was used for the evaluation process. In order to properly simulate the required residual stress states in cylindrical bodies, a new approach for the application of load into the finite element models of hole-drilling experiment is presented. Furthermore, a new procedure with four sets of calibration coefficients is proposed to determine the uniform residual stresses in cylindrical bodies. Results Based on the obtained results, the factors affecting the evaluation are identified and the errors of residual stresses evaluated by ASTM E837 standard are quantified for several cylindrical bodies. Moreover, the testing of the procedure with four sets of calibration coefficients shows a negligible relative error of the evaluated residual stresses even for cylindrical bodies with a small radius. Conclusions It can be stated that the proposed procedure significantly improves the evaluation of the uniform residual stresses in cylindrical bodies. The results of this study can also be used to estimate an error in practical measurements or to determine the radius of a cylindrical body, which is still acceptable when the residual stresses are evaluated by ASTM E837 standard.
[klicova_slova] => Hole-drilling method; Residual stress; Cylindrical component; Finite element simulation
[klicova_slova_orig] => Hole-drilling method; Residual stress; Cylindrical component; Finite element simulation
[url] => https://link.springer.com/article/10.1007/s11340-021-00765-y
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[nadrazena_soucast_zkratka] => FSI
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[originalni_jazyk] => en
[schvalil_id] => 145038
[schvaleno] => 2022-01-06
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[vycet_osob] => HALABUK, D.; NÁVRAT, T.
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[kategorie_nazev] => Publikační výsledky
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[stav] => Schválený
[vysledek_kategorie_id] => PV
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[vlozil] => Informační systém Automat
[upravil] => Informační systém Automat
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[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[identifikator] => ISSN 0014-4851
[identifikator_popis] => ISSN - Experimental Mechanics (US)
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[riv_dodavka_oznaceni] => RIV22-MSM-26210___
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[citace_text] => HALABUK, D.; NÁVRAT, T. Determination of Residual Stresses in Cylindrical Components by the Hole-drilling Method. Experimental Mechanics, 2022, vol. 62, no. 1, p. 87-99. ISSN: 0014-4851.
[citace_html] => HALABUK, D.; NÁVRAT, T. Determination of Residual Stresses in Cylindrical Components by the Hole-drilling Method. Experimental Mechanics, 2022, vol. 62, no. 1, p. 87-99. ISSN: 0014-4851.
[citace_rtf] =>
[citace_bibtex] => @article{BUT172474,
author="Dávid {Halabuk} and Tomáš {Návrat}",
title="Determination of Residual Stresses in Cylindrical Components by the Hole-drilling Method",
journal="Experimental Mechanics",
year="2022",
volume="62",
number="1",
pages="87--99",
doi="10.1007/s11340-021-00765-y",
issn="0014-4851",
url="https://link.springer.com/article/10.1007/s11340-021-00765-y"
}
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[poznamka_metriky] =>
[nazev_en] => Determination of Residual Stresses in Cylindrical Components by the Hole-drilling Method
[popis_en] => Background The hole-drilling method is a widely used technique for the determination of residual stresses, but the application of the method requires a planar surface of the measured component. Objective Since many components have a cylindrical surface in industrial practice, this study focuses on the determination of residual stresses in cylindrical components. Methods Several cylindrical bodies with various residual stress states were simulated and the method described in ASTM E837 standard was used for the evaluation process. In order to properly simulate the required residual stress states in cylindrical bodies, a new approach for the application of load into the finite element models of hole-drilling experiment is presented. Furthermore, a new procedure with four sets of calibration coefficients is proposed to determine the uniform residual stresses in cylindrical bodies. Results Based on the obtained results, the factors affecting the evaluation are identified and the errors of residual stresses evaluated by ASTM E837 standard are quantified for several cylindrical bodies. Moreover, the testing of the procedure with four sets of calibration coefficients shows a negligible relative error of the evaluated residual stresses even for cylindrical bodies with a small radius. Conclusions It can be stated that the proposed procedure significantly improves the evaluation of the uniform residual stresses in cylindrical bodies. The results of this study can also be used to estimate an error in practical measurements or to determine the radius of a cylindrical body, which is still acceptable when the residual stresses are evaluated by ASTM E837 standard.
[klicova_slova_en] => Hole-drilling method; Residual stress; Cylindrical component; Finite element simulation
[vysledek_datum] => 2022-01-05T00:00:00+01:00
)
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(
[vysledek_id] => 172484
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[nazev] => Interpretation of Experimental Data is Substantial for Constitutive Characterization of Arterial Tissue
[nazev_orig] => Interpretation of Experimental Data is Substantial for Constitutive Characterization of Arterial Tissue
[duvernost_udaju_id] => S
[popis] => The paper aims at evaluation of mechanical tests of soft tissues and creation of their representative stress-strain responses and respective constitutive models. Interpretation of sets of experimental results depends highly on the approach to the data analysis. Their common representation through mean and standard deviation may be misleading and give nonrealistic results. In the paper, raw data of seven studies consisting of 11 experimental data sets (concerning carotid wall and atheroma tissues) are re-analyzed to show the importance of their rigorous analysis. The sets of individual uniaxial stress-stretch curves are evaluated using three different protocols: stress-based, stretch-based, and constant-based, and the population-representative response is created by their mean or median values. Except for nearly linear responses, there are substantial differences between the resulting curves, being mostly the highest for constant-based evaluation. But also the stretch-based evaluation may change the character of the response significantly. Finally, medians of the stress-based responses are recommended as the most rigorous approach for arterial and other soft tissues with significant strain stiffening.
[popis_orig] => The paper aims at evaluation of mechanical tests of soft tissues and creation of their representative stress-strain responses and respective constitutive models. Interpretation of sets of experimental results depends highly on the approach to the data analysis. Their common representation through mean and standard deviation may be misleading and give nonrealistic results. In the paper, raw data of seven studies consisting of 11 experimental data sets (concerning carotid wall and atheroma tissues) are re-analyzed to show the importance of their rigorous analysis. The sets of individual uniaxial stress-stretch curves are evaluated using three different protocols: stress-based, stretch-based, and constant-based, and the population-representative response is created by their mean or median values. Except for nearly linear responses, there are substantial differences between the resulting curves, being mostly the highest for constant-based evaluation. But also the stretch-based evaluation may change the character of the response significantly. Finally, medians of the stress-based responses are recommended as the most rigorous approach for arterial and other soft tissues with significant strain stiffening.
[klicova_slova] => carotid artery; constitutive modeling; data analysis; mechanical testing; soft tissue
[klicova_slova_orig] => carotid artery; constitutive modeling; data analysis; mechanical testing; soft tissue
[url] => https://asmedigitalcollection.asme.org/biomechanical/article/143/10/104501/1109033/Interpretation-of-Experimental-Data-is-Substantial
[oecd_obor_id] => 10610
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[originalni_jazyk] => en
[schvalil_id] => 182495
[schvaleno] => 2021-12-13
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[vycet_osob] => LISICKÝ, O.; HRUBANOVÁ, A.; BURŠA, J.
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[citace_text] => LISICKÝ, O.; HRUBANOVÁ, A.; BURŠA, J. Interpretation of Experimental Data is Substantial for Constitutive Characterization of Arterial Tissue. JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME, 2021, vol. 143, no. 10, p. 104501-1 (104501-6 p.)ISSN: 0148-0731.
[citace_html] => LISICKÝ, O.; HRUBANOVÁ, A.; BURŠA, J. Interpretation of Experimental Data is Substantial for Constitutive Characterization of Arterial Tissue. JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME, 2021, vol. 143, no. 10, p. 104501-1 (104501-6 p.)ISSN: 0148-0731.
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[nazev_en] => Interpretation of Experimental Data is Substantial for Constitutive Characterization of Arterial Tissue
[popis_en] => The paper aims at evaluation of mechanical tests of soft tissues and creation of their representative stress-strain responses and respective constitutive models. Interpretation of sets of experimental results depends highly on the approach to the data analysis. Their common representation through mean and standard deviation may be misleading and give nonrealistic results. In the paper, raw data of seven studies consisting of 11 experimental data sets (concerning carotid wall and atheroma tissues) are re-analyzed to show the importance of their rigorous analysis. The sets of individual uniaxial stress-stretch curves are evaluated using three different protocols: stress-based, stretch-based, and constant-based, and the population-representative response is created by their mean or median values. Except for nearly linear responses, there are substantial differences between the resulting curves, being mostly the highest for constant-based evaluation. But also the stretch-based evaluation may change the character of the response significantly. Finally, medians of the stress-based responses are recommended as the most rigorous approach for arterial and other soft tissues with significant strain stiffening.
[klicova_slova_en] => carotid artery; constitutive modeling; data analysis; mechanical testing; soft tissue
[vysledek_datum] => 2021-10-01T00:00:00+02:00
)
[8] => Array
(
[vysledek_id] => 172502
[vysledek_druh_id] => ARTWOS
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[nazev] => Lapidus arthrodesis in combination with arthrodesis of the first metatarsophalangeal joint-biomechanical cadaver study comparing two methods of fixation
[nazev_orig] => Lapidus arthrodesis in combination with arthrodesis of the first metatarsophalangeal joint-biomechanical cadaver study comparing two methods of fixation
[duvernost_udaju_id] => S
[popis] => Aims: To assess the results of a biomechanical test of cadaveric specimens, comparing 2 methods of fixation of modified Lapidus arthrodesis in combination with arthrodesis of the first metatarsophalangeal joint. Methods: A total of 12 cadaveric specimens were used in the test. Arthrodesis of the first MTP joint was in all patients fixed with a Variable Angle LCP 1st MTP Fusion Plate 2.4/2.7. Two methods of fixation of the Lapidus arthrodesis were compared, i.e. fixation with two screws in the PS (plate-screw) version versus fixation with X-Locking Plate 2.4/2.7 in the PP (plate-plate) version. Measurements were obtained with the use of a testing machine ZWICK Z 020-TND with an optical device Mercury RT for measuring deformities. Each specimen was subjected to 3 loading options, a. displacement 5 mm, the support is placed under the proximal phalanx, b. displacement 5 mm, the support is placed under the first metatarsal head and c. load to failure, the support is placed under the first metatarsal head. Results: In all specimens the PS construct showed a statistically considerably higher stiffness than the PP construct. In all specimens treated with the PP construct the load to failure was lower than in the PS construct. For loading mode a., at a significance level of 0.05 (P<0.05), the P-value was 0.036, for mode b. the P-value was 0.007 and for loading mode c. the P-value was 0.006. In addition, age-related decrease in stiffness of the specimen was proved at a significance level of 5% (P=0.004).
[popis_orig] => Aims: To assess the results of a biomechanical test of cadaveric specimens, comparing 2 methods of fixation of modified Lapidus arthrodesis in combination with arthrodesis of the first metatarsophalangeal joint. Methods: A total of 12 cadaveric specimens were used in the test. Arthrodesis of the first MTP joint was in all patients fixed with a Variable Angle LCP 1st MTP Fusion Plate 2.4/2.7. Two methods of fixation of the Lapidus arthrodesis were compared, i.e. fixation with two screws in the PS (plate-screw) version versus fixation with X-Locking Plate 2.4/2.7 in the PP (plate-plate) version. Measurements were obtained with the use of a testing machine ZWICK Z 020-TND with an optical device Mercury RT for measuring deformities. Each specimen was subjected to 3 loading options, a. displacement 5 mm, the support is placed under the proximal phalanx, b. displacement 5 mm, the support is placed under the first metatarsal head and c. load to failure, the support is placed under the first metatarsal head. Results: In all specimens the PS construct showed a statistically considerably higher stiffness than the PP construct. In all specimens treated with the PP construct the load to failure was lower than in the PS construct. For loading mode a., at a significance level of 0.05 (P<0.05), the P-value was 0.036, for mode b. the P-value was 0.007 and for loading mode c. the P-value was 0.006. In addition, age-related decrease in stiffness of the specimen was proved at a significance level of 5% (P=0.004).
[klicova_slova] => arthrodesis, metatarsophalangeal joint, Lapidus, cadaver, biomechanical study
[klicova_slova_orig] => arthrodesis, metatarsophalangeal joint, Lapidus, cadaver, biomechanical study
[url] => https://biomed.papers.upol.cz/corproof.php?tartkey=bio-000000-2814
[oecd_obor_id] => 30211
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[odpovedny_utvar_nazev] => Ústav mechaniky těles, mechatroniky a biomechaniky
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[nadrazena_soucast_nazev] => Fakulta strojního inženýrství
[originalni_jazyk] => en
[schvalil_id] => 254501
[schvaleno] => 2023-03-01
[vykazovat_riv] => 1
[vykazovat_riv_zmeny] => 1
[slozka_id] => 118324
[posledni_diagnostika] =>
[vycet_osob] => KUNOVSKÝ, R.; NÁVRAT, T.; KOČIŠ, J.; VOSYNEK, P.; PINK, T.; JOUKAL, M.; ČIŽMÁŘ, I.
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[citace_text] => KUNOVSKÝ, R.; NÁVRAT, T.; KOČIŠ, J.; VOSYNEK, P.; PINK, T.; JOUKAL, M.; ČIŽMÁŘ, I. Lapidus arthrodesis in combination with arthrodesis of the first metatarsophalangeal joint-biomechanical cadaver study comparing two methods of fixation. BIOMEDICAL PAPERS-OLOMOUC, 2021, vol. 165, no. X, p. 1-9. ISSN: 1213-8118.
[citace_html] => KUNOVSKÝ, R.; NÁVRAT, T.; KOČIŠ, J.; VOSYNEK, P.; PINK, T.; JOUKAL, M.; ČIŽMÁŘ, I. Lapidus arthrodesis in combination with arthrodesis of the first metatarsophalangeal joint-biomechanical cadaver study comparing two methods of fixation. BIOMEDICAL PAPERS-OLOMOUC, 2021, vol. 165, no. X, p. 1-9. ISSN: 1213-8118.
[citace_rtf] =>
[citace_bibtex] => @article{BUT172502,
author="Radek {Kunovský} and Ján {Kočiš} and Tomáš {Návrat} and Petr {Vosynek} and Tomáš {Pink} and Marek {Joukal} and Igor {Čižmář}",
title="Lapidus arthrodesis in combination with arthrodesis of the first metatarsophalangeal joint-biomechanical cadaver study comparing two methods of fixation",
journal="BIOMEDICAL PAPERS-OLOMOUC",
year="2021",
volume="165",
number="X",
pages="1--9",
doi="10.5507/bp.2021.025",
issn="1213-8118",
url="https://biomed.papers.upol.cz/corproof.php?tartkey=bio-000000-2814"
}
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[nazev_en] => Lapidus arthrodesis in combination with arthrodesis of the first metatarsophalangeal joint-biomechanical cadaver study comparing two methods of fixation
[popis_en] => Aims: To assess the results of a biomechanical test of cadaveric specimens, comparing 2 methods of fixation of modified Lapidus arthrodesis in combination with arthrodesis of the first metatarsophalangeal joint. Methods: A total of 12 cadaveric specimens were used in the test. Arthrodesis of the first MTP joint was in all patients fixed with a Variable Angle LCP 1st MTP Fusion Plate 2.4/2.7. Two methods of fixation of the Lapidus arthrodesis were compared, i.e. fixation with two screws in the PS (plate-screw) version versus fixation with X-Locking Plate 2.4/2.7 in the PP (plate-plate) version. Measurements were obtained with the use of a testing machine ZWICK Z 020-TND with an optical device Mercury RT for measuring deformities. Each specimen was subjected to 3 loading options, a. displacement 5 mm, the support is placed under the proximal phalanx, b. displacement 5 mm, the support is placed under the first metatarsal head and c. load to failure, the support is placed under the first metatarsal head. Results: In all specimens the PS construct showed a statistically considerably higher stiffness than the PP construct. In all specimens treated with the PP construct the load to failure was lower than in the PS construct. For loading mode a., at a significance level of 0.05 (P<0.05), the P-value was 0.036, for mode b. the P-value was 0.007 and for loading mode c. the P-value was 0.006. In addition, age-related decrease in stiffness of the specimen was proved at a significance level of 5% (P=0.004).
[klicova_slova_en] => arthrodesis, metatarsophalangeal joint, Lapidus, cadaver, biomechanical study
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[nazev] => Temperature Dependence of Fracture Characteristics ofVariously Heat-Treated Grades of Ultra-High-Strength Steel:Experimental and Modelling
[nazev_orig] => Temperature Dependence of Fracture Characteristics ofVariously Heat-Treated Grades of Ultra-High-Strength Steel:Experimental and Modelling
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[popis] => The temperature dependence of tensile characteristics and fracture toughness of the standardly heat-treated low-alloyed steel OCHN3MFA along with three additionally heat-treated grades was experimentally studied. In the temperature range of ⟨−196; 22⟩ °C, all the additional heat treatments transferred the standard steel from a high- to ultra-high strength levels even with improved tensile ductility characteristics. This could be explained by a reduction of the inclusion content, refinement of the martensitic blocks, ductile retained austenite content, and homogenization of the shape ratio of martensitic laths as revealed by metallographic, X-Ray, and EBSD techniques. On the other hand, the values of the fracture toughness of all grades were found to be comparable in the whole temperature range as the cause of a high stress triaxiality in the pre-cracked Charpy V-notch samples. The values of the fracture toughness of the standard steel grade could be predicted well using the fracture model proposed by Pokluda et al. based on the tensile characteristics. Such a prediction failed in the case of additionally heat-treated grades due to the different temperature dependence of the fracture mechanisms occurring in the tensile and fracture-toughness tests. While the tensile samples fractured in a ductile-dimple mode at all temperatures, the fracture-toughness specimens exhibited a transition from the ductile to quasi-brittle fracture mode with decreasing temperature. This transition could be interpreted in terms of a transfer from the model proposed by Rice and Johnson to the model of Tvergaard and Hutchinson.
[popis_orig] => The temperature dependence of tensile characteristics and fracture toughness of the standardly heat-treated low-alloyed steel OCHN3MFA along with three additionally heat-treated grades was experimentally studied. In the temperature range of ⟨−196; 22⟩ °C, all the additional heat treatments transferred the standard steel from a high- to ultra-high strength levels even with improved tensile ductility characteristics. This could be explained by a reduction of the inclusion content, refinement of the martensitic blocks, ductile retained austenite content, and homogenization of the shape ratio of martensitic laths as revealed by metallographic, X-Ray, and EBSD techniques. On the other hand, the values of the fracture toughness of all grades were found to be comparable in the whole temperature range as the cause of a high stress triaxiality in the pre-cracked Charpy V-notch samples. The values of the fracture toughness of the standard steel grade could be predicted well using the fracture model proposed by Pokluda et al. based on the tensile characteristics. Such a prediction failed in the case of additionally heat-treated grades due to the different temperature dependence of the fracture mechanisms occurring in the tensile and fracture-toughness tests. While the tensile samples fractured in a ductile-dimple mode at all temperatures, the fracture-toughness specimens exhibited a transition from the ductile to quasi-brittle fracture mode with decreasing temperature. This transition could be interpreted in terms of a transfer from the model proposed by Rice and Johnson to the model of Tvergaard and Hutchinson.
[klicova_slova] => ultra-high steel grades; tensile characteristics; fracture toughness; temperature dependence; modelling fracture
[klicova_slova_orig] => ultra-high steel grades; tensile characteristics; fracture toughness; temperature dependence; modelling fracture
[url] => https://www.mdpi.com/1996-1944/14/19/5875
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[vycet_osob] => POKLUDA, J.; DLOUHÝ, I.; KIANICOVÁ, M.; ČUPERA, J.; HORNÍKOVÁ, J.; ŠANDERA, P.
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[citace_text] => POKLUDA, J.; DLOUHÝ, I.; KIANICOVÁ, M.; ČUPERA, J.; HORNÍKOVÁ, J.; ŠANDERA, P. Temperature Dependence of Fracture Characteristics ofVariously Heat-Treated Grades of Ultra-High-Strength Steel:Experimental and Modelling. Materials, 2021, vol. 14, no. 19, p. 1-28. ISSN: 1996-1944.
[citace_html] => POKLUDA, J.; DLOUHÝ, I.; KIANICOVÁ, M.; ČUPERA, J.; HORNÍKOVÁ, J.; ŠANDERA, P. Temperature Dependence of Fracture Characteristics ofVariously Heat-Treated Grades of Ultra-High-Strength Steel:Experimental and Modelling. Materials, 2021, vol. 14, no. 19, p. 1-28. ISSN: 1996-1944.
[citace_rtf] =>
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author="Jaroslav {Pokluda} and Ivo {Dlouhý} and Marta {Kianicová} and Jan {Čupera} and Jana {Horníková} and Pavel {Šandera}",
title="Temperature Dependence of Fracture Characteristics ofVariously Heat-Treated Grades of Ultra-High-Strength Steel:Experimental and Modelling",
journal="Materials",
year="2021",
volume="14",
number="19",
pages="1--28",
doi="10.3390/ma14195875",
url="https://www.mdpi.com/1996-1944/14/19/5875"
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[nazev_en] => Temperature Dependence of Fracture Characteristics ofVariously Heat-Treated Grades of Ultra-High-Strength Steel:Experimental and Modelling
[popis_en] => The temperature dependence of tensile characteristics and fracture toughness of the standardly heat-treated low-alloyed steel OCHN3MFA along with three additionally heat-treated grades was experimentally studied. In the temperature range of ⟨−196; 22⟩ °C, all the additional heat treatments transferred the standard steel from a high- to ultra-high strength levels even with improved tensile ductility characteristics. This could be explained by a reduction of the inclusion content, refinement of the martensitic blocks, ductile retained austenite content, and homogenization of the shape ratio of martensitic laths as revealed by metallographic, X-Ray, and EBSD techniques. On the other hand, the values of the fracture toughness of all grades were found to be comparable in the whole temperature range as the cause of a high stress triaxiality in the pre-cracked Charpy V-notch samples. The values of the fracture toughness of the standard steel grade could be predicted well using the fracture model proposed by Pokluda et al. based on the tensile characteristics. Such a prediction failed in the case of additionally heat-treated grades due to the different temperature dependence of the fracture mechanisms occurring in the tensile and fracture-toughness tests. While the tensile samples fractured in a ductile-dimple mode at all temperatures, the fracture-toughness specimens exhibited a transition from the ductile to quasi-brittle fracture mode with decreasing temperature. This transition could be interpreted in terms of a transfer from the model proposed by Rice and Johnson to the model of Tvergaard and Hutchinson.
[klicova_slova_en] => ultra-high steel grades; tensile characteristics; fracture toughness; temperature dependence; modelling fracture
[vysledek_datum] => 2021-10-07T00:00:00+02:00
)
[10] => Array
(
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[nazev] => Experimentally Verified Analytical Models of Piezoelectric Cantilevers in Different Design Configurations
[nazev_orig] => Experimentally Verified Analytical Models of Piezoelectric Cantilevers in Different Design Configurations
[duvernost_udaju_id] => S
[popis] => This paper deals with analytical modelling of piezoelectric energy harvesting systems for generating useful electricity from ambient vibrations and comparing the usefulness of materials commonly used in designing such harvesters for energy harvesting applications. The kinetic energy harvesters have the potential to be used as an autonomous source of energy for wireless applications. Here in this paper, the considered energy harvesting device is designed as a piezoelectric cantilever beam with different piezoelectric materials in both bimorph and unimorph configurations. For both these configurations a single degree-of-freedom model of a kinematically excited cantilever with a full and partial electrode length respecting the dimensions of added tip mass is derived. The analytical model is based on Euler-Bernoulli beam theory and its output is successfully verified with available experimental results of piezoelectric energy harvesters in three different configurations. The electrical output of the derived model for the three different materials (PZT-5A, PZZN-PLZT and PVDF) and design configurations is in accordance with lab measurements which are presented in the paper. Therefore, this model can be used for predicting the amount of harvested power in a particular vibratory environment. Finally, the derived analytical model was used to compare the energy harvesting effectiveness of the three considered materials for both simple harmonic excitation and random vibrations of the corresponding harvesters. The comparison revealed that both PZT-5A and PZZN-PLZT are an excellent choice for energy harvesting purposes thanks to high electrical power output, whereas PVDF should be used only for sensing applications due to low harvested electrical power output.
[popis_orig] => This paper deals with analytical modelling of piezoelectric energy harvesting systems for generating useful electricity from ambient vibrations and comparing the usefulness of materials commonly used in designing such harvesters for energy harvesting applications. The kinetic energy harvesters have the potential to be used as an autonomous source of energy for wireless applications. Here in this paper, the considered energy harvesting device is designed as a piezoelectric cantilever beam with different piezoelectric materials in both bimorph and unimorph configurations. For both these configurations a single degree-of-freedom model of a kinematically excited cantilever with a full and partial electrode length respecting the dimensions of added tip mass is derived. The analytical model is based on Euler-Bernoulli beam theory and its output is successfully verified with available experimental results of piezoelectric energy harvesters in three different configurations. The electrical output of the derived model for the three different materials (PZT-5A, PZZN-PLZT and PVDF) and design configurations is in accordance with lab measurements which are presented in the paper. Therefore, this model can be used for predicting the amount of harvested power in a particular vibratory environment. Finally, the derived analytical model was used to compare the energy harvesting effectiveness of the three considered materials for both simple harmonic excitation and random vibrations of the corresponding harvesters. The comparison revealed that both PZT-5A and PZZN-PLZT are an excellent choice for energy harvesting purposes thanks to high electrical power output, whereas PVDF should be used only for sensing applications due to low harvested electrical power output.
[klicova_slova] => energy harvesting; vibrations; piezoelectric; analytical model; beam model; equivalent model; power prediction
[klicova_slova_orig] => energy harvesting; vibrations; piezoelectric; analytical model; beam model; equivalent model; power prediction
[url] => https://www.mdpi.com/1424-8220/21/20/6759
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[citace_text] => MACHŮ, Z.; RUBEŠ, O.; ŠEVEČEK, O.; HADAŠ, Z. Experimentally Verified Analytical Models of Piezoelectric Cantilevers in Different Design Configurations. SENSORS, 2021, vol. 21, no. 20, p. 6759-6759. ISSN: 1424-8220.
[citace_html] => MACHŮ, Z.; RUBEŠ, O.; ŠEVEČEK, O.; HADAŠ, Z. Experimentally Verified Analytical Models of Piezoelectric Cantilevers in Different Design Configurations. SENSORS, 2021, vol. 21, no. 20, p. 6759-6759. ISSN: 1424-8220.
[citace_rtf] =>
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title="Experimentally Verified Analytical Models of Piezoelectric Cantilevers in Different Design Configurations",
journal="SENSORS",
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volume="21",
number="20",
pages="6759--6759",
doi="10.3390/s21206759",
url="https://www.mdpi.com/1424-8220/21/20/6759"
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[nazev_en] => Experimentally Verified Analytical Models of Piezoelectric Cantilevers in Different Design Configurations
[popis_en] => This paper deals with analytical modelling of piezoelectric energy harvesting systems for generating useful electricity from ambient vibrations and comparing the usefulness of materials commonly used in designing such harvesters for energy harvesting applications. The kinetic energy harvesters have the potential to be used as an autonomous source of energy for wireless applications. Here in this paper, the considered energy harvesting device is designed as a piezoelectric cantilever beam with different piezoelectric materials in both bimorph and unimorph configurations. For both these configurations a single degree-of-freedom model of a kinematically excited cantilever with a full and partial electrode length respecting the dimensions of added tip mass is derived. The analytical model is based on Euler-Bernoulli beam theory and its output is successfully verified with available experimental results of piezoelectric energy harvesters in three different configurations. The electrical output of the derived model for the three different materials (PZT-5A, PZZN-PLZT and PVDF) and design configurations is in accordance with lab measurements which are presented in the paper. Therefore, this model can be used for predicting the amount of harvested power in a particular vibratory environment. Finally, the derived analytical model was used to compare the energy harvesting effectiveness of the three considered materials for both simple harmonic excitation and random vibrations of the corresponding harvesters. The comparison revealed that both PZT-5A and PZZN-PLZT are an excellent choice for energy harvesting purposes thanks to high electrical power output, whereas PVDF should be used only for sensing applications due to low harvested electrical power output.
[klicova_slova_en] => energy harvesting; vibrations; piezoelectric; analytical model; beam model; equivalent model; power prediction
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[duvernost_udaju_id] => S
[popis] => This paper deals with a calculation of stiffness and damping coefficients of the hydrodynamic lemon-bore journal bearings of the finite length. The hydrodynamic pressure distribution is described by the dynamic Reynolds equation solved using the finite volume method. The variable temperature in the circumferential and axial directions of the bearing is considered in the calculation resulting in changes of the lubricant viscosity and density. The proposed computational model involves the mixing of the lubricant, obtaining a steady-state solution of the pressure and temperature, and establishing the equilibrium position of the journal. Based on the small dynamic displacements of the journal from the equilibrium position, the stiffness and damping coefficients are determined. The results of these dynamic characteristics are presented in dependence on speed for the selected load of the particular lemon-bore bearing.
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[citace_text] => POKORNÝ, J.; NÁVRAT, T. Calculation of stiffness and damping coefficients of hydrodynamic lemon-bore journal bearings. Proceedings of Computational mechanics 2021. Plzeň: University of West Bohemia, 2021. p. 192-195. ISBN: 978-80-261-1059-0.
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year="2021",
pages="192--195",
publisher="University of West Bohemia",
address="Plzeň",
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[title] => Determination of Residual Stresses in Cylindrical Components by the Hole-drilling Method
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[year] => 2022
[id_vav] => 172474
)
[7] => Array
(
[quotations] => LISICKÝ, O.; HRUBANOVÁ, A.; BURŠA, J.
[title] => Interpretation of Experimental Data is Substantial for Constitutive Characterization of Arterial Tissue
[typ] => PV
[year] => 2021
[id_vav] => 172484
)
[8] => Array
(
[quotations] => KUNOVSKÝ, R.; NÁVRAT, T.; KOČIŠ, J.; VOSYNEK, P.; PINK, T.; JOUKAL, M.; ČIŽMÁŘ, I.
[title] => Lapidus arthrodesis in combination with arthrodesis of the first metatarsophalangeal joint-biomechanical cadaver study comparing two methods of fixation
[typ] => PV
[year] => 2021
[id_vav] => 172502
)
[9] => Array
(
[quotations] => POKLUDA, J.; DLOUHÝ, I.; KIANICOVÁ, M.; ČUPERA, J.; HORNÍKOVÁ, J.; ŠANDERA, P.
[title] => Temperature Dependence of Fracture Characteristics ofVariously Heat-Treated Grades of Ultra-High-Strength Steel:Experimental and Modelling
[typ] => PV
[year] => 2021
[id_vav] => 172690
)
[10] => Array
(
[quotations] => MACHŮ, Z.; RUBEŠ, O.; ŠEVEČEK, O.; HADAŠ, Z.
[title] => Experimentally Verified Analytical Models of Piezoelectric Cantilevers in Different Design Configurations
[typ] => PV
[year] => 2021
[id_vav] => 172761
)
[11] => Array
(
[quotations] => POKORNÝ, J.; NÁVRAT, T.
[title] => Calculation of stiffness and damping coefficients of hydrodynamic lemon-bore journal bearings
[typ] => PV
[year] => 2021
[id_vav] => 173053
)
[12] => Array
(
[quotations] => STODOLA, M.; RAJCHL, M.; BRABLC, M.; FROLÍK, S.; KŘIVÁNEK, V.
[title] => Maxwell Points of Dynamical Control Systems Based on Vertical Rolling Disc-Numerical Solutions
[typ] => PV
[year] => 2021
[id_vav] => 173085
)
[13] => Array
(
[quotations] =>
[title] => Výpočtová mechanika 2021
[typ] => EV
[year] => 2021
[id_vav] => 173128
)
)
)