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[nazev] => Implant Preference and Clinical Outcomes of Patients with Staged Bilateral Total Knee Arthroplasty: All-Polyethylene and Contralateral Metal-Backed Tibial Components
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[popis] => Numerous studies have compared metal-backed components (MBTs) and all-polyethylene tibial components (APTs), but none of them specifically analysed the clinical results and the overall patient preference in patients who had undergone a staged bilateral knee replacement. The purpose of this study is to compare clinical results, perceived range of motion, and overall implant preference among patients who had undergone staged bilateral knee replacement with an APT and contralateral knee replacement with MBTs. A dataset of 62 patients from a single centre who underwent staged bilateral TKA between 2009 and 2022 was selected and retrospectively analysed. Tibial component removal was performed in three knees overall, all of which had MBTs. The mean measured Knee Score (KS) of knees with APTs was 78.37 and that of contralateral knees with MBTs was 77.4. The mean measured Function (FS) of knees with APTs was 78.22, and that of contralateral knees with MBs was 76.29. The mean flexion angle of knees with APTs was 103.8 and that for knees with MBTs was 101.04 degrees. A total of 54.8% of the patients preferred the knee that received APTs over contralateral MBTs. In our cohort, TKA with an APT in one knee and an MBT in the contralateral knee recorded similar clinical results and perceived ranges of motion. Patients in general preferred the knee that received an APT over contralateral knee with an MBT.
[popis_orig] => Numerous studies have compared metal-backed components (MBTs) and all-polyethylene tibial components (APTs), but none of them specifically analysed the clinical results and the overall patient preference in patients who had undergone a staged bilateral knee replacement. The purpose of this study is to compare clinical results, perceived range of motion, and overall implant preference among patients who had undergone staged bilateral knee replacement with an APT and contralateral knee replacement with MBTs. A dataset of 62 patients from a single centre who underwent staged bilateral TKA between 2009 and 2022 was selected and retrospectively analysed. Tibial component removal was performed in three knees overall, all of which had MBTs. The mean measured Knee Score (KS) of knees with APTs was 78.37 and that of contralateral knees with MBTs was 77.4. The mean measured Function (FS) of knees with APTs was 78.22, and that of contralateral knees with MBs was 76.29. The mean flexion angle of knees with APTs was 103.8 and that for knees with MBTs was 101.04 degrees. A total of 54.8% of the patients preferred the knee that received APTs over contralateral MBTs. In our cohort, TKA with an APT in one knee and an MBT in the contralateral knee recorded similar clinical results and perceived ranges of motion. Patients in general preferred the knee that received an APT over contralateral knee with an MBT.
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title="Implant Preference and Clinical Outcomes of Patients with Staged Bilateral Total Knee Arthroplasty: All-Polyethylene and Contralateral Metal-Backed Tibial Components",
journal="Journal of Clinical Medicine",
year="2023",
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number="23",
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[nazev_en] => Implant Preference and Clinical Outcomes of Patients with Staged Bilateral Total Knee Arthroplasty: All-Polyethylene and Contralateral Metal-Backed Tibial Components
[popis_en] => Numerous studies have compared metal-backed components (MBTs) and all-polyethylene tibial components (APTs), but none of them specifically analysed the clinical results and the overall patient preference in patients who had undergone a staged bilateral knee replacement. The purpose of this study is to compare clinical results, perceived range of motion, and overall implant preference among patients who had undergone staged bilateral knee replacement with an APT and contralateral knee replacement with MBTs. A dataset of 62 patients from a single centre who underwent staged bilateral TKA between 2009 and 2022 was selected and retrospectively analysed. Tibial component removal was performed in three knees overall, all of which had MBTs. The mean measured Knee Score (KS) of knees with APTs was 78.37 and that of contralateral knees with MBTs was 77.4. The mean measured Function (FS) of knees with APTs was 78.22, and that of contralateral knees with MBs was 76.29. The mean flexion angle of knees with APTs was 103.8 and that for knees with MBTs was 101.04 degrees. A total of 54.8% of the patients preferred the knee that received APTs over contralateral MBTs. In our cohort, TKA with an APT in one knee and an MBT in the contralateral knee recorded similar clinical results and perceived ranges of motion. Patients in general preferred the knee that received an APT over contralateral knee with an MBT.
[klicova_slova_en] => bilateral knee replacement; total knee arthroplasty; all-polyethylene tibia; metal-backed
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[popis_en] => Most frequently used structure-based constitutive models of arterial wall apply assumptions on two symmetric helical (and dispersed) fibre families which, however, are not well supported with histological findings where two collagen fibre families are seldom found. Moreover, bimodal distributions of fibre directions may originate also from their waviness combined with ignoring differences between local and global fibre orientations. In contrast, if the model parameters are identified without histological information on collagen fibre directions, the resulting mean angles of both fibre families are close to +/- 45 degrees, which contradicts nearly all histologic findings. The presented study exploited automated polarized light microscopy for detection of collagen fibre directions in porcine aorta under different biaxial extensions and approximated the resulting histograms with unimodal and bimodal von Mises distributions. Their comparison showed dominantly circumferential orientation of collagen fibres. Their concentration parameter for unimodal distributions increased with circumferential load, no matter if acting uniaxially or equibiaxially. For bimodal distributions, the angle between both dominant fibre directions (chosen as measure of fibre alignment) decreased similarly for both uniaxial and equibiaxial loads. These results indicate the existence of a single family of wavy circumferential collagen fibres in all layers of the aortic wall. Bimodal distributions of fibre directions presented sometimes in literature may come rather from waviness of circumferentially arranged fibres than from two symmetric families of helical fibres. To obtain a final evidence, the fibre orientation should be analysed together with their waviness.
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[klicova_slova] => Arterial wall mechanics; Constitutive models; Transverse deformation; Poisson's ratio; Model calibration; Hyperfit software
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[citace_text] => SKÁCEL, P.; BURŠA, J. Need for transverse strain data for fitting constitutive models of arterial tissue to uniaxial tests. Journal of the Mechanical Behavior of Biomedical Materials, 2024, vol. 150, no. 150, p. 106194-1 (106194-14 p.)ISSN: 1751-6161.
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[nazev_en] => Need for transverse strain data for fitting constitutive models of arterial tissue to uniaxial tests
[popis_en] => The study deals with the process of estimation of material parameters from uniaxial test data of arterial tissue and focuses on the role of transverse strains. Two fitting strategies are analyzed and their impact on the predictive and descriptive capabilities of the resulting model is evaluated. The standard fitting procedure (strategy A) based on longitudinal stress-strain curves is compared with the enhanced approach (strategy B) taking also the transverse strain test data into account. The study is performed on a large set of material data adopted from literature and for a variety of constitutive models developed for fibrous soft tissues. The standard procedure (A) ignoring the transverse strain test data is found rather hazardous, leading often to unrealistic predictions of the model exhibiting auxetic behaviour. In contrast, the alternative fitting method (B) ensures a realistic strain response of the model and is proved to be superior since it does not require any significant demands of computational effort or additional testing. The results presented in this paper show that even the artificial transverse strain data (i.e., not measured during testing but generated ex post, based on assumed Poisson’s ratio) are much less hazardous than total disregard of the transverse strain response.
[klicova_slova_en] => Arterial wall mechanics; Constitutive models; Transverse deformation; Poisson's ratio; Model calibration; Hyperfit software
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[poznamka_metriky] =>
[nazev_en] => Analytical software for evaluation and visualization of process data of the entire production line.
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[nazev] => Novel approach for mass sensing using non-linear micromechanical resonators
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[duvernost_udaju_id] => S
[popis] => The contribution deals with a numerical modelling and analysis of micro/nano-mechanical resonators operating in the non-linear regime which is intended to be utilized for an enhancement of the resonator sensing range eventually its sensitivity. In this work we aim to present an alternative/novel way for solution of such a problem.
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APPLIED MECHANICS 2023
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jednosložkové materiály s vysokou viskozitou
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jednosložkové materiály s vysokou viskozitou
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[popis] => Pokročilý dávkovací stroj s nanášecí hlavou je kompletně automatizované a velmi variabilní zařízení, které pokrývá poptávku v oblasti liniového dávkování nesilikonových materiálů. Vzniklo kompletně nového zařízení po mechanické, elektrické, senzorické i softwarové stránce. Zařízení umožňuje automatizované nanášení materiálu podle požadavku zákazníka po trajektorii ve třech osách. Je přizpůsobeno nanášení materiálů s obtížnými vlastnostmi, např. obsahu abrazivní složky.
[popis_orig] => Pokročilý dávkovací stroj s nanášecí hlavou je kompletně automatizované a velmi variabilní zařízení, které pokrývá poptávku v oblasti liniového dávkování nesilikonových materiálů. Vzniklo kompletně nového zařízení po mechanické, elektrické, senzorické i softwarové stránce. Zařízení umožňuje automatizované nanášení materiálu podle požadavku zákazníka po trajektorii ve třech osách. Je přizpůsobeno nanášení materiálů s obtížnými vlastnostmi, např. obsahu abrazivní složky.
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[klicova_slova_orig] => Dávkovací stroj; Nanášecí hlava; Vysoce viskózní materiály; Dávkování materiálu
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[nazev_en] => Advanced application head and dispensing machine for
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[popis_en] => The advanced dispensing machine with dispensing head is a fully automated and highly variable device that covers the demand in the field of linear dispensing of non-silicone materials. A completely new device has been created mechanically, electrically, sensory and software-wise. The device allows automated material application according to customer requirements along a trajectory in three axes. It is adapted to coating materials with difficult properties, e.g. abrasive content.
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[popis] => Pokročilá nanášecı́ hlava a dávkovacı́ stroj pro silikonové materiály. Zařízení umožní automatizované nanášení materiálu podle požadavku zákazníka po trajektorii ve
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[popis_orig] => Pokročilá nanášecı́ hlava a dávkovacı́ stroj pro silikonové materiály. Zařízení umožní automatizované nanášení materiálu podle požadavku zákazníka po trajektorii ve
třech osách. Zařízení je přizpůsobeno nanášení silikonových
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[klicova_slova] => Nanášecí hlava; Silikonové materiály; Dávkovací stroj
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[citace_text] => GREPL, R.; ADÁMEK, R.; POSPÍŠIL, D.: Pokročilá nanášecí hlava a dávkovací stroj pro silikonové materiály. URL: https://www.amtech-dispensing.cz/produkty/. (Prototyp)
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author="Robert {Grepl} and Roman {Adámek} and Daniel {Pospíšil}",
title="Pokročilá nanášecí hlava a dávkovací stroj pro silikonové materiály",
year="2023",
url="https://www.amtech-dispensing.cz/produkty/",
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[nazev] => Analysis of effect of domain polarization switching near sharp piezoelectric bi-material notches
[nazev_orig] => Analysis of effect of domain polarization switching near sharp piezoelectric bi-material notches
[duvernost_udaju_id] => S
[popis] => The asymptotic in-plane problem of a bi-material sharp notch with various geometrical pattern and an interface crack in a generally monoclinic piezoelectric bimaterial is analysed using the expanded Lekhnitskii-Eshelby-Stroh formalism, [1]. Assuming small-scale domain switching, the size and shape of the domain switching zone is calculated adopting the energetic switching criterion and micromechanical domain switching model suggested by Hwang et al., [2] for a specified material combination, geometry and polarization orientation. Next, the boundary value problem with the prescribed spontaneous strain and polarization within the switching domain is solved and their influence on the in-plane intensity of singularity at a vertex of the interface in piezoelectric bi-material-bonded joint or at the tip of interface crack is computed. The effects of geometrical and loading parameters on the resulting variation of the intensity of singularity are discussed.
[popis_orig] => The asymptotic in-plane problem of a bi-material sharp notch with various geometrical pattern and an interface crack in a generally monoclinic piezoelectric bimaterial is analysed using the expanded Lekhnitskii-Eshelby-Stroh formalism, [1]. Assuming small-scale domain switching, the size and shape of the domain switching zone is calculated adopting the energetic switching criterion and micromechanical domain switching model suggested by Hwang et al., [2] for a specified material combination, geometry and polarization orientation. Next, the boundary value problem with the prescribed spontaneous strain and polarization within the switching domain is solved and their influence on the in-plane intensity of singularity at a vertex of the interface in piezoelectric bi-material-bonded joint or at the tip of interface crack is computed. The effects of geometrical and loading parameters on the resulting variation of the intensity of singularity are discussed.
[klicova_slova] => Polarization switching, Piezoelectricity, Bi-material notch, Asymptotic solution, Mixed FEM
[klicova_slova_orig] => Polarization switching, Piezoelectricity, Bi-material notch, Asymptotic solution, Mixed FEM
[url] => https://pubs.aip.org/aip/acp/article/2848/1/020004/2895667/Analysis-of-effect-of-domain-polarization
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[vycet_osob] => HRSTKA, M.; KOTOUL, M.; PROFANT, T.
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[identifikator] => ISBN 9780735445482 ISSN 0094-243X
[identifikator_popis] => ISBN - 20th International Conference on Fracture and Damage Mechanics, DM 2022 ISSN - AIP conference proceedings (US)
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[citace_text] => HRSTKA, M.; KOTOUL, M.; PROFANT, T. Analysis of effect of domain polarization switching near sharp piezoelectric bi-material notches. In 20th International Conference on Fracture and Damage Mechanics, DM 2022. AIP conference proceedings. AIP Conference Proceedings. Melville, NY, USA: American Institute of Physics Inc., 2023. p. 020004-1 (020004-17 p.)ISBN: 9780735445482. ISSN: 0094-243X.
[citace_html] => HRSTKA, M.; KOTOUL, M.; PROFANT, T. Analysis of effect of domain polarization switching near sharp piezoelectric bi-material notches. In 20th International Conference on Fracture and Damage Mechanics, DM 2022. AIP conference proceedings. AIP Conference Proceedings. Melville, NY, USA: American Institute of Physics Inc., 2023. p. 020004-1 (020004-17 p.)ISBN: 9780735445482. ISSN: 0094-243X.
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[nazev_en] => Analysis of effect of domain polarization switching near sharp piezoelectric bi-material notches
[popis_en] => The asymptotic in-plane problem of a bi-material sharp notch with various geometrical pattern and an interface crack in a generally monoclinic piezoelectric bimaterial is analysed using the expanded Lekhnitskii-Eshelby-Stroh formalism, [1]. Assuming small-scale domain switching, the size and shape of the domain switching zone is calculated adopting the energetic switching criterion and micromechanical domain switching model suggested by Hwang et al., [2] for a specified material combination, geometry and polarization orientation. Next, the boundary value problem with the prescribed spontaneous strain and polarization within the switching domain is solved and their influence on the in-plane intensity of singularity at a vertex of the interface in piezoelectric bi-material-bonded joint or at the tip of interface crack is computed. The effects of geometrical and loading parameters on the resulting variation of the intensity of singularity are discussed.
[klicova_slova_en] => Polarization switching, Piezoelectricity, Bi-material notch, Asymptotic solution, Mixed FEM
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[nazev] => Influence of flexoelectricity on an interface crack between two dissimilar dielectric materials
[nazev_orig] => Influence of flexoelectricity on an interface crack between two dissimilar dielectric materials
[duvernost_udaju_id] => S
[popis] => In the present paper, the interface crack between two dissimilar dielectric materials under a mechanical load is investigated with including flexoelectricity effects. Flexoelectricity is a size dependent electro-mechanical coupling phenomenon, where the electric polarization is induced by a strain gradient in dielectrics. The strain gradients may potentially break the inversion symmetry in centrosymmetric crystals and polarization is observed even in all dielectric materials. The polarization is proportional to the strain gradients in the direct flexoelectricity. Layered composite structures are frequently utilized in microelectronics. Due to a poor adhesion of protection layer and basic material, the interface crack can be created there and for the prediction of failure of these structures it becomes essential to investigate distribution of the interfacial stress and strain fields. Governing equations in the gradient theory contain higher-order derivatives than in the standard continuum mechanics. Therefore, a reliable computational tool is required to solve these boundary-value problems. The mixed finite element method (FEM) is developed, where the standard C0 continuous finite elements are utilized for independent approximations of displacements and strains. The constraints between the strain gradients and displacements are satisfied by collocation at Gaussian integration points inside elements. In numerical examples, a parametric study is performed with respect to flexoelectric and elastic coefficients for both material regions. The influence of these parameters on the crack opening displacement is discussed.
[popis_orig] => In the present paper, the interface crack between two dissimilar dielectric materials under a mechanical load is investigated with including flexoelectricity effects. Flexoelectricity is a size dependent electro-mechanical coupling phenomenon, where the electric polarization is induced by a strain gradient in dielectrics. The strain gradients may potentially break the inversion symmetry in centrosymmetric crystals and polarization is observed even in all dielectric materials. The polarization is proportional to the strain gradients in the direct flexoelectricity. Layered composite structures are frequently utilized in microelectronics. Due to a poor adhesion of protection layer and basic material, the interface crack can be created there and for the prediction of failure of these structures it becomes essential to investigate distribution of the interfacial stress and strain fields. Governing equations in the gradient theory contain higher-order derivatives than in the standard continuum mechanics. Therefore, a reliable computational tool is required to solve these boundary-value problems. The mixed finite element method (FEM) is developed, where the standard C0 continuous finite elements are utilized for independent approximations of displacements and strains. The constraints between the strain gradients and displacements are satisfied by collocation at Gaussian integration points inside elements. In numerical examples, a parametric study is performed with respect to flexoelectric and elastic coefficients for both material regions. The influence of these parameters on the crack opening displacement is discussed.
[klicova_slova] => Direct flexoelectricitygradient theory, pure mechanical loadinduced electric potential
[klicova_slova_orig] => Direct flexoelectricitygradient theory, pure mechanical loadinduced electric potential
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[citace_text] => SLÁDEK, J.; SLÁDEK, V.; HRYTSYNA, M.; PROFANT, T. Influence of flexoelectricity on an interface crack between two dissimilar dielectric materials. In 23rd European Conference on Fracture, ECF 2022. Procedia Structural Integrity. Procedia Structural Integrity. Elsevier B.V., 2023. p. 1584-1590. ISBN: 9781713870302. ISSN: 2452-3216.
[citace_html] => SLÁDEK, J.; SLÁDEK, V.; HRYTSYNA, M.; PROFANT, T. Influence of flexoelectricity on an interface crack between two dissimilar dielectric materials. In 23rd European Conference on Fracture, ECF 2022. Procedia Structural Integrity. Procedia Structural Integrity. Elsevier B.V., 2023. p. 1584-1590. ISBN: 9781713870302. ISSN: 2452-3216.
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author="Ján {Sládek} and Vladimír {Sládek} and Maryan {Hrytsyna} and Tomáš {Profant}",
title="Influence of flexoelectricity on an interface crack between two dissimilar dielectric materials",
booktitle="23rd European Conference on Fracture, ECF 2022",
year="2023",
series="Procedia Structural Integrity",
journal="Procedia Structural Integrity",
volume="42",
number="42",
pages="1584--1590",
publisher="Elsevier B.V.",
doi="10.1016/j.prostr.2022.12.200",
isbn="9781713870302",
url="https://www.sciencedirect.com/science/article/pii/S2452321622007570?pes=vor"
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[nazev_en] => Influence of flexoelectricity on an interface crack between two dissimilar dielectric materials
[popis_en] => In the present paper, the interface crack between two dissimilar dielectric materials under a mechanical load is investigated with including flexoelectricity effects. Flexoelectricity is a size dependent electro-mechanical coupling phenomenon, where the electric polarization is induced by a strain gradient in dielectrics. The strain gradients may potentially break the inversion symmetry in centrosymmetric crystals and polarization is observed even in all dielectric materials. The polarization is proportional to the strain gradients in the direct flexoelectricity. Layered composite structures are frequently utilized in microelectronics. Due to a poor adhesion of protection layer and basic material, the interface crack can be created there and for the prediction of failure of these structures it becomes essential to investigate distribution of the interfacial stress and strain fields. Governing equations in the gradient theory contain higher-order derivatives than in the standard continuum mechanics. Therefore, a reliable computational tool is required to solve these boundary-value problems. The mixed finite element method (FEM) is developed, where the standard C0 continuous finite elements are utilized for independent approximations of displacements and strains. The constraints between the strain gradients and displacements are satisfied by collocation at Gaussian integration points inside elements. In numerical examples, a parametric study is performed with respect to flexoelectric and elastic coefficients for both material regions. The influence of these parameters on the crack opening displacement is discussed.
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[popis] => The contribution brings results of high-frequency fatigue tests of the 1.4306 and 1.4307 steels. The S304L austenitic stainless steels are the most versatile and widely used stainless steels. They are used in food processing, chemical industry, petrochemicals, but also in mechanical and civil engineering. The 1.4306 steel is more highly alloyed and more corrosion resistant than 1.4307. A new trend in bridge structures is the use of stainless steels for their corrosion resistance and mechanical properties. The bridge structures are loaded cyclically and are designed for decades of operation. Thus, long-term fatigue properties are an important issue. The results of experimental studies serve as inputs for a reliable assessment of the service life of cyclically loaded structures. Measurements of both steel types were performed on ultrasonic fatigue testing systems. Cyclic loading was performed in fully reversed push-pull mode with the stress ratio R = - 1. Experimental results plotted in the S-N curves are shown. From the results, it can be concluded that 1.4306 steel shows a slightly higher fatigue resistance than 1.4307 steel. The failure in the gigacycle region (around 108 and 109 cycles) only occurs in the case of 1.4306 steel. Fracture surfaces were analyzed and only surface crack initiation was observed.
[popis_orig] => The contribution brings results of high-frequency fatigue tests of the 1.4306 and 1.4307 steels. The S304L austenitic stainless steels are the most versatile and widely used stainless steels. They are used in food processing, chemical industry, petrochemicals, but also in mechanical and civil engineering. The 1.4306 steel is more highly alloyed and more corrosion resistant than 1.4307. A new trend in bridge structures is the use of stainless steels for their corrosion resistance and mechanical properties. The bridge structures are loaded cyclically and are designed for decades of operation. Thus, long-term fatigue properties are an important issue. The results of experimental studies serve as inputs for a reliable assessment of the service life of cyclically loaded structures. Measurements of both steel types were performed on ultrasonic fatigue testing systems. Cyclic loading was performed in fully reversed push-pull mode with the stress ratio R = - 1. Experimental results plotted in the S-N curves are shown. From the results, it can be concluded that 1.4306 steel shows a slightly higher fatigue resistance than 1.4307 steel. The failure in the gigacycle region (around 108 and 109 cycles) only occurs in the case of 1.4306 steel. Fracture surfaces were analyzed and only surface crack initiation was observed.
[klicova_slova] => austenitic stainless steels; fatigue failure; Very high cyle fatigue
[klicova_slova_orig] => austenitic stainless steels; fatigue failure; Very high cyle fatigue
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[citace_text] => KLUSÁK, J.; KOZÁKOVÁ, K.; FINTOVÁ, S.; SEITL, S. Fatigue lifetimes of 1.4306 and 1.4307 stainless steels subjected to ultrasonic loading. Procedia Structural Integrity, 2023, vol. 2022, no. 42, p. 1369-1375. ISSN: 2452-3216.
[citace_html] => KLUSÁK, J.; KOZÁKOVÁ, K.; FINTOVÁ, S.; SEITL, S. Fatigue lifetimes of 1.4306 and 1.4307 stainless steels subjected to ultrasonic loading. Procedia Structural Integrity, 2023, vol. 2022, no. 42, p. 1369-1375. ISSN: 2452-3216.
[citace_rtf] =>
[citace_bibtex] => @article{BUT187906,
author="Kamila {Kozáková} and Jan {Klusák} and Stanislav {Seitl} and Stanislava {Fintová}",
title="Fatigue lifetimes of 1.4306 and 1.4307 stainless steels subjected to ultrasonic loading",
journal="Procedia Structural Integrity",
year="2023",
volume="2022",
number="42",
pages="1369--1375",
doi="10.1016/j.prostr.2022.12.174",
url="https://www.sciencedirect.com/science/article/pii/S2452321622007314?pes=vor"
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[nazev_en] => Fatigue lifetimes of 1.4306 and 1.4307 stainless steels subjected to ultrasonic loading
[popis_en] => The contribution brings results of high-frequency fatigue tests of the 1.4306 and 1.4307 steels. The S304L austenitic stainless steels are the most versatile and widely used stainless steels. They are used in food processing, chemical industry, petrochemicals, but also in mechanical and civil engineering. The 1.4306 steel is more highly alloyed and more corrosion resistant than 1.4307. A new trend in bridge structures is the use of stainless steels for their corrosion resistance and mechanical properties. The bridge structures are loaded cyclically and are designed for decades of operation. Thus, long-term fatigue properties are an important issue. The results of experimental studies serve as inputs for a reliable assessment of the service life of cyclically loaded structures. Measurements of both steel types were performed on ultrasonic fatigue testing systems. Cyclic loading was performed in fully reversed push-pull mode with the stress ratio R = - 1. Experimental results plotted in the S-N curves are shown. From the results, it can be concluded that 1.4306 steel shows a slightly higher fatigue resistance than 1.4307 steel. The failure in the gigacycle region (around 108 and 109 cycles) only occurs in the case of 1.4306 steel. Fracture surfaces were analyzed and only surface crack initiation was observed.
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[nazev] => Numerical modelling of fatigue crack closure and its implication on crack front curvature using ΔCTODp
[nazev_orig] => Numerical modelling of fatigue crack closure and its implication on crack front curvature using ΔCTODp
[duvernost_udaju_id] => S
[popis] => One of the widely used approaches to characterize fatigue crack propagation is the use of the effective stress intensity factor range ΔKeff, which relies on determination of crack closure value Kcl. The used models of crack closure are most frequently-two-dimensional, however, for real cracks, the 3D effects should be taken into ac-count. The paper presents 3D finite element analyses of the influences of crack front shape, inserted cycles (loading cycles between node releases) and crack closure on the crack driving force in terms of ΔKeff and ΔCTODp (plastic part of crack tip opening displacement range). Numerically obtained crack closure depended on the simulation strategy. In the case of inserted cycles, crack closure disappeared in the internal part of the specimen and remained only near the free edges. The use of ΔCTODp had the advantage of a well-defined parameter in situations where ΔKeff was problematic, namely at the corner points, which did not allow finding of equalized crack driving force along the whole crack front using ΔKeff. Equalized crack driving force in terms of ΔCTODp was found for crack front curvature with the edge angle 15.4 degrees in simulation with crack closure, which was in good agreement with the experimentally measured value of 16 degrees. Loops produced by loading and unloading branches of the force vs CTOD diagrams helped to describe the crack closure process and magnitude. Actual values of CTOD did not agree with the classical idea of 2D solutions under plane strain and plane stress. CTOD was larger in the internal part of the specimen than at the free edges, even in simulations with no crack face contact.
[popis_orig] => One of the widely used approaches to characterize fatigue crack propagation is the use of the effective stress intensity factor range ΔKeff, which relies on determination of crack closure value Kcl. The used models of crack closure are most frequently-two-dimensional, however, for real cracks, the 3D effects should be taken into ac-count. The paper presents 3D finite element analyses of the influences of crack front shape, inserted cycles (loading cycles between node releases) and crack closure on the crack driving force in terms of ΔKeff and ΔCTODp (plastic part of crack tip opening displacement range). Numerically obtained crack closure depended on the simulation strategy. In the case of inserted cycles, crack closure disappeared in the internal part of the specimen and remained only near the free edges. The use of ΔCTODp had the advantage of a well-defined parameter in situations where ΔKeff was problematic, namely at the corner points, which did not allow finding of equalized crack driving force along the whole crack front using ΔKeff. Equalized crack driving force in terms of ΔCTODp was found for crack front curvature with the edge angle 15.4 degrees in simulation with crack closure, which was in good agreement with the experimentally measured value of 16 degrees. Loops produced by loading and unloading branches of the force vs CTOD diagrams helped to describe the crack closure process and magnitude. Actual values of CTOD did not agree with the classical idea of 2D solutions under plane strain and plane stress. CTOD was larger in the internal part of the specimen than at the free edges, even in simulations with no crack face contact.
[klicova_slova] => Crack front curvature; CTOD; Crack closure; Finite element modelling; Steel
[klicova_slova_orig] => Crack front curvature; CTOD; Crack closure; Finite element modelling; Steel
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[citace_text] => OPLT, T.; VOJTEK, T.; KUBÍČEK, R.; POKORNÝ, P.; HUTAŘ, P. Numerical modelling of fatigue crack closure and its implication on crack front curvature using ΔCTODp. International Journal of Fatigue, 2023, vol. 171, no. 107570, 13 p. ISSN: 1879-3452.
[citace_html] => OPLT, T.; VOJTEK, T.; KUBÍČEK, R.; POKORNÝ, P.; HUTAŘ, P. Numerical modelling of fatigue crack closure and its implication on crack front curvature using ΔCTODp. International Journal of Fatigue, 2023, vol. 171, no. 107570, 13 p. ISSN: 1879-3452.
[citace_rtf] =>
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author="Tomáš {Oplt} and Tomáš {Vojtek} and Radek {Kubíček} and Pavel {Pokorný} and Pavel {Hutař}",
title="Numerical modelling of fatigue crack closure and its implication on crack front curvature using ΔCTODp",
journal="International Journal of Fatigue",
year="2023",
volume="171",
number="107570",
pages="13",
doi="10.1016/j.ijfatigue.2023.107570",
issn="0142-1123",
url="https://www.sciencedirect.com/science/article/pii/S0142112323000713?via%3Dihub"
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[oecd_tree_oblast_nazev] => 2. Engineering and Technology
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[oecd_tree_obor_nazev] => 2.3 Mechanical engineering
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[nazev_en] => Numerical modelling of fatigue crack closure and its implication on crack front curvature using ΔCTODp
[popis_en] => One of the widely used approaches to characterize fatigue crack propagation is the use of the effective stress intensity factor range ΔKeff, which relies on determination of crack closure value Kcl. The used models of crack closure are most frequently-two-dimensional, however, for real cracks, the 3D effects should be taken into ac-count. The paper presents 3D finite element analyses of the influences of crack front shape, inserted cycles (loading cycles between node releases) and crack closure on the crack driving force in terms of ΔKeff and ΔCTODp (plastic part of crack tip opening displacement range). Numerically obtained crack closure depended on the simulation strategy. In the case of inserted cycles, crack closure disappeared in the internal part of the specimen and remained only near the free edges. The use of ΔCTODp had the advantage of a well-defined parameter in situations where ΔKeff was problematic, namely at the corner points, which did not allow finding of equalized crack driving force along the whole crack front using ΔKeff. Equalized crack driving force in terms of ΔCTODp was found for crack front curvature with the edge angle 15.4 degrees in simulation with crack closure, which was in good agreement with the experimentally measured value of 16 degrees. Loops produced by loading and unloading branches of the force vs CTOD diagrams helped to describe the crack closure process and magnitude. Actual values of CTOD did not agree with the classical idea of 2D solutions under plane strain and plane stress. CTOD was larger in the internal part of the specimen than at the free edges, even in simulations with no crack face contact.
[klicova_slova_en] => Crack front curvature; CTOD; Crack closure; Finite element modelling; Steel
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