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[popis] => The solution of stress intensity factorsat the front of cracks emanating from the notchesis a standard fracture mechanics problem. Values of stress intensity factors are greatly affected by anotch geometry. A special effort was engagedin determination ofthe dependence of the stress intensity factor on the crack length and the critical crack length corresponding to a vanishing influence of the notch in stress intensity factors calculations.The aim of this article is to verify the Lefort’s formula for the critical crack by another wayand to plot results in clear illustrative graphs.The Ansys finite element codewas used for various combination of both the total length of the notch/crack configuration and the notch radius of U-notchesto draw the attention to the effects of non-linear transformation of data during the data processing.
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[url] => http://ijamce.iraj.in//paper_detail.php?paper_id=17014&nameInfluence_of_Nonlinear_Transformation_of_Data_on_Verification_Lefort%27s_Formula_for_the_Critical_Crack_Length
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[citace_text] => HORNÍKOVÁ, J.; ŠANDERA, P. Influence of Nonlinear Transformation of Data on Verification Lefort’s Formula for the Critical Crack Length. International Journal of Advances in Mechanical and Civil Engineering, 2020, vol. 7, no. 2, p. 6-11. ISSN: 2394-2827.
[citace_html] => HORNÍKOVÁ, J.; ŠANDERA, P. Influence of Nonlinear Transformation of Data on Verification Lefort’s Formula for the Critical Crack Length. International Journal of Advances in Mechanical and Civil Engineering, 2020, vol. 7, no. 2, p. 6-11. ISSN: 2394-2827.
[citace_rtf] =>
[citace_bibtex] => @article{BUT164491,
author="Jana {Horníková} and Pavel {Šandera}",
title="Influence of Nonlinear Transformation of Data on Verification Lefort’s Formula for the Critical Crack Length",
journal="International Journal of Advances in Mechanical and Civil Engineering",
year="2020",
volume="7",
number="2",
pages="6--11",
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url="http://ijamce.iraj.in//paper_detail.php?paper_id=17014&nameInfluence_of_Nonlinear_Transformation_of_Data_on_Verification_Lefort%27s_Formula_for_the_Critical_Crack_Length"
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[popis_en] => The solution of stress intensity factorsat the front of cracks emanating from the notchesis a standard fracture mechanics problem. Values of stress intensity factors are greatly affected by anotch geometry. A special effort was engagedin determination ofthe dependence of the stress intensity factor on the crack length and the critical crack length corresponding to a vanishing influence of the notch in stress intensity factors calculations.The aim of this article is to verify the Lefort’s formula for the critical crack by another wayand to plot results in clear illustrative graphs.The Ansys finite element codewas used for various combination of both the total length of the notch/crack configuration and the notch radius of U-notchesto draw the attention to the effects of non-linear transformation of data during the data processing.
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[klicova_slova] => residual stress; hole-drilling method; plasticity effect; finite element method; computational simulation
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[citace_rtf] =>
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author="Tomáš {Návrat} and Dávid {Halabuk} and Petr {Vosynek}",
title="Efficiency of Plasticity Correction in the Hole-Drilling Residual Stress Measurement",
journal="Materials",
year="2020",
volume="13",
number="15",
pages="1--15",
doi="10.3390/ma13153396",
url="https://www.mdpi.com/1996-1944/13/15/3396"
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[nazev_orig] => Samočinně rozvinutelný habitat pro extrémní prostředí s lehkou přetlakovatelnou konstrukcí
[duvernost_udaju_id] => C
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Výzkumné mise, kdy se jedná o výzkumnou stanici, v opuštěné oblasti bez přístupu k veřejným sítím elektrického napětí apod.
Základna pro budování budoucí infrastruktury v odlehlých oblastech.
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Výzkumné mise, kdy se jedná o výzkumnou stanici, v opuštěné oblasti bez přístupu k veřejným sítím elektrického napětí apod.
Základna pro budování budoucí infrastruktury v odlehlých oblastech.
[klicova_slova] => Habitat, extremní prostředí, přetlakovatelná konstrukce
[klicova_slova_orig] => Habitat, extremní prostředí, přetlakovatelná konstrukce
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[citace_text] => NÁVRAT, T.; KATOLICKÝ, J.; HEJČÍK, J.: Samočinně rozvinutelný habitat pro extrémní prostředí s lehkou přetlakovatelnou konstrukcí. (Prototyp)
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[citace_rtf] =>
[citace_bibtex] => @misc{BUT164650,
author="Jaroslav {Katolický} and Tomáš {Návrat} and Jiří {Hejčík}",
title="Samočinně rozvinutelný habitat pro extrémní prostředí s lehkou přetlakovatelnou konstrukcí",
year="2020",
note="Prototype"
}
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[poznamka_metriky] =>
[nazev_en] => Self-expanding Habitat for Extreme Environments with Lightweight Overpressure Construction
[popis_en] => Rescue missions, where it is necessary to quickly build the necessary facilities for the management of operations, or storage of materials in situations such as floods, earthquakes, etc. This use is mainly intended for rescue services, the military or non-profit humanitarian organizations where public networks may be damaged and connection to them.
Research missions, in the case of a research station, in a deserted area without access to public electricity networks, etc .
Base for building future infrastructure in remote areas.
[klicova_slova_en] => Habitat, extreme environment, overpressure construction
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[popis] => The article focuses on a modeling and subsequent optimization of a novel layered architecture of the vibration piezoceramic energy harvester composed of ZrO2/Al2O3/BaTiO(3)layers and containing thermal residual stresses. The developed analytical/numerical model allows to determine the complete electromechanical response and the apparent fracture toughness of the multilayer vibration energy harvester, upon consideration of thermal residual stresses and time-harmonic kinematic excitation. The derived model uses the Euler-Bernoulli beam theory, Hamilton's variational principle, and a classical laminate theory to determine the first natural frequency, steady-state electromechanical response of the beam upon harmonic vibrations, and also the mechanical stresses within particular layers of the harvester. The laminate apparent fracture toughness is computed by means of the weight function approach. A crucial point is the further optimization of the layered architecture from both the electromechanical response and the fracture resistance point of view. Maximal allowable excitation acceleration of the harvester upon which the piezoelectric layer will not fail is determined. It makes possible to better use the harvester's capabilities in a given application and simultaneously guarantee its safe operation. Outputs of the derived analytical model were validated with finite element method simulations and available experimental results, and a good agreement between all approaches was obtained.
[popis_orig] => The article focuses on a modeling and subsequent optimization of a novel layered architecture of the vibration piezoceramic energy harvester composed of ZrO2/Al2O3/BaTiO(3)layers and containing thermal residual stresses. The developed analytical/numerical model allows to determine the complete electromechanical response and the apparent fracture toughness of the multilayer vibration energy harvester, upon consideration of thermal residual stresses and time-harmonic kinematic excitation. The derived model uses the Euler-Bernoulli beam theory, Hamilton's variational principle, and a classical laminate theory to determine the first natural frequency, steady-state electromechanical response of the beam upon harmonic vibrations, and also the mechanical stresses within particular layers of the harvester. The laminate apparent fracture toughness is computed by means of the weight function approach. A crucial point is the further optimization of the layered architecture from both the electromechanical response and the fracture resistance point of view. Maximal allowable excitation acceleration of the harvester upon which the piezoelectric layer will not fail is determined. It makes possible to better use the harvester's capabilities in a given application and simultaneously guarantee its safe operation. Outputs of the derived analytical model were validated with finite element method simulations and available experimental results, and a good agreement between all approaches was obtained.
[klicova_slova] => ceramic laminate; piezoelectricity; finite element model; classical laminate theory; vibrations; energy harvesting; optimization; fracture resistance
[klicova_slova_orig] => ceramic laminate; piezoelectricity; finite element model; classical laminate theory; vibrations; energy harvesting; optimization; fracture resistance
[url] => https://journals.sagepub.com/doi/full/10.1177/1045389X20942832
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[citace_text] => MACHŮ, Z.; ŠEVEČEK, O.; HADAŠ, Z.; KOTOUL, M. Modeling of electromechanical response and fracture resistance of multilayer piezoelectric energy harvester with residual stresses. JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES, 2020, vol. 31, no. 19, p. 2261-2287. ISSN: 1530-8138.
[citace_html] => MACHŮ, Z.; ŠEVEČEK, O.; HADAŠ, Z.; KOTOUL, M. Modeling of electromechanical response and fracture resistance of multilayer piezoelectric energy harvester with residual stresses. JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES, 2020, vol. 31, no. 19, p. 2261-2287. ISSN: 1530-8138.
[citace_rtf] =>
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author="Zdeněk {Machů} and Oldřich {Ševeček} and Zdeněk {Hadaš} and Michal {Kotoul}",
title="Modeling of electromechanical response and fracture resistance of multilayer piezoelectric energy harvester with residual stresses",
journal="JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES",
year="2020",
volume="31",
number="19",
pages="2261--2287",
doi="10.1177/1045389X20942832",
issn="1045-389X",
url="https://journals.sagepub.com/doi/full/10.1177/1045389X20942832"
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[nazev_en] => Modeling of electromechanical response and fracture resistance of multilayer piezoelectric energy harvester with residual stresses
[popis_en] => The article focuses on a modeling and subsequent optimization of a novel layered architecture of the vibration piezoceramic energy harvester composed of ZrO2/Al2O3/BaTiO(3)layers and containing thermal residual stresses. The developed analytical/numerical model allows to determine the complete electromechanical response and the apparent fracture toughness of the multilayer vibration energy harvester, upon consideration of thermal residual stresses and time-harmonic kinematic excitation. The derived model uses the Euler-Bernoulli beam theory, Hamilton's variational principle, and a classical laminate theory to determine the first natural frequency, steady-state electromechanical response of the beam upon harmonic vibrations, and also the mechanical stresses within particular layers of the harvester. The laminate apparent fracture toughness is computed by means of the weight function approach. A crucial point is the further optimization of the layered architecture from both the electromechanical response and the fracture resistance point of view. Maximal allowable excitation acceleration of the harvester upon which the piezoelectric layer will not fail is determined. It makes possible to better use the harvester's capabilities in a given application and simultaneously guarantee its safe operation. Outputs of the derived analytical model were validated with finite element method simulations and available experimental results, and a good agreement between all approaches was obtained.
[klicova_slova_en] => ceramic laminate; piezoelectricity; finite element model; classical laminate theory; vibrations; energy harvesting; optimization; fracture resistance
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[nazev] => Mass Spectrometry of Heavy Analytes and Large Biological Aggregates by Monitoring Changes in the Quality Factor of Nanomechanical Resonators in Air
[nazev_orig] => Mass Spectrometry of Heavy Analytes and Large Biological Aggregates by Monitoring Changes in the Quality Factor of Nanomechanical Resonators in Air
[duvernost_udaju_id] => S
[popis] => Nanomechanical resonators are routinely used for identification of various analytes like biological and chemical molecules, viruses or bacteria cells from the frequency response. This identification based on the multimode frequency shift measurement is limited to analyte of mass that is much lighter than the resonator mass; hence the analyte can be modeled as a point particle and, as such, its stiffness and nontrivial binding effects like surface stress can be neglected. For heavy analytes (> MDa) this identification, however, leads to incorrectly estimated masses. Here, by using a well-known frequency response of the nanomechanical resonator in air, we show that the heavy analyte can be identified without a need for highly challenging analysis of the analyte position, stiffness and/or binding effects just by monitoring changes in quality factor of a single harmonic frequency. Theory with a detailed procedure of mass extraction from quality factor is developed. In air, the quality factor depends on analyte mass and known air damping, while impact of the intrinsic dissipation is negligibly small. We find that the highest mass sensitivity (for considered resonator dimensions ~zg) can be achieved for rarely measured lateral mode, whereas the commonly detected flexural mode yields the lowest sensitivity. Validity of proposed procedure is confirmed by extracting mass of heavy analytes (GDa) made of protein and E. coli bacteria cells, and the ragweed pollen nanoparticle adsorbed on surface of the nanomechanical resonator(s) in air, of which the required changes in quality factor were previously experimentally measured, and by using numerical simulations. Our results open a doorway for rapid detection of viruses and bacteria cells using standard nanomechanical mass sensors.
[popis_orig] => Nanomechanical resonators are routinely used for identification of various analytes like biological and chemical molecules, viruses or bacteria cells from the frequency response. This identification based on the multimode frequency shift measurement is limited to analyte of mass that is much lighter than the resonator mass; hence the analyte can be modeled as a point particle and, as such, its stiffness and nontrivial binding effects like surface stress can be neglected. For heavy analytes (> MDa) this identification, however, leads to incorrectly estimated masses. Here, by using a well-known frequency response of the nanomechanical resonator in air, we show that the heavy analyte can be identified without a need for highly challenging analysis of the analyte position, stiffness and/or binding effects just by monitoring changes in quality factor of a single harmonic frequency. Theory with a detailed procedure of mass extraction from quality factor is developed. In air, the quality factor depends on analyte mass and known air damping, while impact of the intrinsic dissipation is negligibly small. We find that the highest mass sensitivity (for considered resonator dimensions ~zg) can be achieved for rarely measured lateral mode, whereas the commonly detected flexural mode yields the lowest sensitivity. Validity of proposed procedure is confirmed by extracting mass of heavy analytes (GDa) made of protein and E. coli bacteria cells, and the ragweed pollen nanoparticle adsorbed on surface of the nanomechanical resonator(s) in air, of which the required changes in quality factor were previously experimentally measured, and by using numerical simulations. Our results open a doorway for rapid detection of viruses and bacteria cells using standard nanomechanical mass sensors.
[klicova_slova] => mass spectrometry; mass sensor; NEMS; nanomechanical resonator; nanomechanics
[klicova_slova_orig] => mass spectrometry; mass sensor; NEMS; nanomechanical resonator; nanomechanics
[url] => https://pubs.acs.org/doi/10.1021/acssensors.0c00756
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[citace_text] => STACHIV, I.; GAN, L.; KUO, CH.Y.; ŠITTNER, P.; ŠEVEČEK, O. Mass Spectrometry of Heavy Analytes and Large Biological Aggregates by Monitoring Changes in the Quality Factor of Nanomechanical Resonators in Air. ACS Sensors, 2020, vol. 5, no. 7, p. 2128-2135. ISSN: 2379-3694.
[citace_html] => STACHIV, I.; GAN, L.; KUO, CH.Y.; ŠITTNER, P.; ŠEVEČEK, O. Mass Spectrometry of Heavy Analytes and Large Biological Aggregates by Monitoring Changes in the Quality Factor of Nanomechanical Resonators in Air. ACS Sensors, 2020, vol. 5, no. 7, p. 2128-2135. ISSN: 2379-3694.
[citace_rtf] =>
[citace_bibtex] => @article{BUT164671,
author="STACHIV, I. and GAN, L. and KUO, CH.Y. and ŠITTNER, P. and ŠEVEČEK, O.",
title="Mass Spectrometry of Heavy Analytes and Large Biological Aggregates by Monitoring Changes in the Quality Factor of Nanomechanical Resonators in Air",
journal="ACS Sensors",
year="2020",
volume="5",
number="7",
pages="2128--2135",
doi="10.1021/acssensors.0c00756",
url="https://pubs.acs.org/doi/10.1021/acssensors.0c00756"
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[nazev_en] => Mass Spectrometry of Heavy Analytes and Large Biological Aggregates by Monitoring Changes in the Quality Factor of Nanomechanical Resonators in Air
[popis_en] => Nanomechanical resonators are routinely used for identification of various analytes like biological and chemical molecules, viruses or bacteria cells from the frequency response. This identification based on the multimode frequency shift measurement is limited to analyte of mass that is much lighter than the resonator mass; hence the analyte can be modeled as a point particle and, as such, its stiffness and nontrivial binding effects like surface stress can be neglected. For heavy analytes (> MDa) this identification, however, leads to incorrectly estimated masses. Here, by using a well-known frequency response of the nanomechanical resonator in air, we show that the heavy analyte can be identified without a need for highly challenging analysis of the analyte position, stiffness and/or binding effects just by monitoring changes in quality factor of a single harmonic frequency. Theory with a detailed procedure of mass extraction from quality factor is developed. In air, the quality factor depends on analyte mass and known air damping, while impact of the intrinsic dissipation is negligibly small. We find that the highest mass sensitivity (for considered resonator dimensions ~zg) can be achieved for rarely measured lateral mode, whereas the commonly detected flexural mode yields the lowest sensitivity. Validity of proposed procedure is confirmed by extracting mass of heavy analytes (GDa) made of protein and E. coli bacteria cells, and the ragweed pollen nanoparticle adsorbed on surface of the nanomechanical resonator(s) in air, of which the required changes in quality factor were previously experimentally measured, and by using numerical simulations. Our results open a doorway for rapid detection of viruses and bacteria cells using standard nanomechanical mass sensors.
[klicova_slova_en] => mass spectrometry; mass sensor; NEMS; nanomechanical resonator; nanomechanics
[vysledek_datum] => 2020-06-19T00:00:00+02:00
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[nazev] => An efficient method for establishing the static equilibrium position of the hydrodynamic tilting-pad journal bearings
[nazev_orig] => An efficient method for establishing the static equilibrium position of the hydrodynamic tilting-pad journal bearings
[duvernost_udaju_id] => S
[popis] => Establishing the static equilibrium position of the tilting-pad journal bearing is key to determining the bearing performance. Methods for establishing the equilibrium were divided into three groups and compared. The fastest convergence was achieved using the quasi-Newton methods, namely the Anderson mixing scheme and Broyden’s methods. Root-finding boundaries and the Armijo rule were implemented into these methods to obtain the globally convergent efficient methods. To test the methods, the two-dimensional computational model of the tilting-pad journal bearing based on the thermo-elasto-hydrodynamic lubrication theory was proposed. The results of the equilibrium for two bearings operating in laminar and transition flow regimes under different loads and speeds were shown. These results were validated with two sets of published experimental data.
[popis_orig] => Establishing the static equilibrium position of the tilting-pad journal bearing is key to determining the bearing performance. Methods for establishing the equilibrium were divided into three groups and compared. The fastest convergence was achieved using the quasi-Newton methods, namely the Anderson mixing scheme and Broyden’s methods. Root-finding boundaries and the Armijo rule were implemented into these methods to obtain the globally convergent efficient methods. To test the methods, the two-dimensional computational model of the tilting-pad journal bearing based on the thermo-elasto-hydrodynamic lubrication theory was proposed. The results of the equilibrium for two bearings operating in laminar and transition flow regimes under different loads and speeds were shown. These results were validated with two sets of published experimental data.
[klicova_slova] => Hydrodynamic; Tilting pad journal bearing; Numerical analysis; Steadily loaded
[klicova_slova_orig] => Hydrodynamic; Tilting pad journal bearing; Numerical analysis; Steadily loaded
[url] => https://doi.org/10.1016/j.triboint.2020.106641
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[citace_text] => POKORNÝ, J. An efficient method for establishing the static equilibrium position of the hydrodynamic tilting-pad journal bearings. Tribology International, 2021, vol. 153, no. 1, p. 1-14. ISSN: 1879-2464.
[citace_html] => POKORNÝ, J. An efficient method for establishing the static equilibrium position of the hydrodynamic tilting-pad journal bearings. Tribology International, 2021, vol. 153, no. 1, p. 1-14. ISSN: 1879-2464.
[citace_rtf] =>
[citace_bibtex] => @article{BUT165353,
author="Jan {Pokorný}",
title="An efficient method for establishing the static equilibrium position of the hydrodynamic tilting-pad journal bearings",
journal="Tribology International",
year="2021",
volume="153",
number="1",
pages="1--14",
doi="10.1016/j.triboint.2020.106641",
issn="0301-679X",
url="https://doi.org/10.1016/j.triboint.2020.106641"
}
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[oecd_tree_podobor_nazev] => Mechanical engineering
[poznamka_metriky] =>
[nazev_en] => An efficient method for establishing the static equilibrium position of the hydrodynamic tilting-pad journal bearings
[popis_en] => Establishing the static equilibrium position of the tilting-pad journal bearing is key to determining the bearing performance. Methods for establishing the equilibrium were divided into three groups and compared. The fastest convergence was achieved using the quasi-Newton methods, namely the Anderson mixing scheme and Broyden’s methods. Root-finding boundaries and the Armijo rule were implemented into these methods to obtain the globally convergent efficient methods. To test the methods, the two-dimensional computational model of the tilting-pad journal bearing based on the thermo-elasto-hydrodynamic lubrication theory was proposed. The results of the equilibrium for two bearings operating in laminar and transition flow regimes under different loads and speeds were shown. These results were validated with two sets of published experimental data.
[klicova_slova_en] => Hydrodynamic; Tilting pad journal bearing; Numerical analysis; Steadily loaded
[vysledek_datum] => 2021-01-01T00:00:00+01:00
)
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(
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[nazev] => Crack Protective Layered Architecture of Lead-Free Piezoelectric Energy Harvester in Bistable Configuration
[nazev_orig] => Crack Protective Layered Architecture of Lead-Free Piezoelectric Energy Harvester in Bistable Configuration
[duvernost_udaju_id] => S
[popis] => Kinetic piezoelectric energy harvesters are used to power up ultra-low power devices without batteries as an alternative and eco-friendly source of energy. This paper deals with a novel design of a lead-free multilayer energy harvester based on BaTiO3 ceramics. This material is very brittle and might be cracked in small amplitudes of oscillations. However, the main aim of our development is the design of a crack protective layered architecture that protects an energy harvesting device in very high amplitudes of oscillations. This architecture is described and optimized for chosen geometry and the resulted one degree of freedom coupled electromechanical model is derived. This model could be used in bistable configuration and the model is extended about the nonlinear stiffness produced by auxiliary magnets. The complex bistable vibration energy harvester is simulated to predict operation in a wide range of frequency excitation. It should demonstrate typical operation of designed beam and a stress intensity factor was calculated for layers. The whole system, without presence of cracks, was simulated with an excitation acceleration of amplitude up to 1g. The maximal obtained power was around 2 mW at the frequency around 40 Hz with a maximal tip displacement 7.5 mm. The maximal operating amplitude of this novel design was calculated around 10 mm which is 10-times higher than without protective layers.
[popis_orig] => Kinetic piezoelectric energy harvesters are used to power up ultra-low power devices without batteries as an alternative and eco-friendly source of energy. This paper deals with a novel design of a lead-free multilayer energy harvester based on BaTiO3 ceramics. This material is very brittle and might be cracked in small amplitudes of oscillations. However, the main aim of our development is the design of a crack protective layered architecture that protects an energy harvesting device in very high amplitudes of oscillations. This architecture is described and optimized for chosen geometry and the resulted one degree of freedom coupled electromechanical model is derived. This model could be used in bistable configuration and the model is extended about the nonlinear stiffness produced by auxiliary magnets. The complex bistable vibration energy harvester is simulated to predict operation in a wide range of frequency excitation. It should demonstrate typical operation of designed beam and a stress intensity factor was calculated for layers. The whole system, without presence of cracks, was simulated with an excitation acceleration of amplitude up to 1g. The maximal obtained power was around 2 mW at the frequency around 40 Hz with a maximal tip displacement 7.5 mm. The maximal operating amplitude of this novel design was calculated around 10 mm which is 10-times higher than without protective layers.
[klicova_slova] => energy harvesting; piezoelectrics; bimorph; lead free ceramic; bistable energy harvester; nonlinear resonators
[klicova_slova_orig] => energy harvesting; piezoelectrics; bimorph; lead free ceramic; bistable energy harvester; nonlinear resonators
[url] => https://www.mdpi.com/1424-8220/20/20/5808
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[vycet_osob] => RUBEŠ, O.; MACHŮ, Z.; ŠEVEČEK, O.; HADAŠ, Z.
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[kod_doi] => 10.3390/s20205808
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[citace_text] => RUBEŠ, O.; MACHŮ, Z.; ŠEVEČEK, O.; HADAŠ, Z. Crack Protective Layered Architecture of Lead-Free Piezoelectric Energy Harvester in Bistable Configuration. SENSORS, 2020, vol. 20, no. 20, p. 1-18. ISSN: 1424-8220.
[citace_html] => RUBEŠ, O.; MACHŮ, Z.; ŠEVEČEK, O.; HADAŠ, Z. Crack Protective Layered Architecture of Lead-Free Piezoelectric Energy Harvester in Bistable Configuration. SENSORS, 2020, vol. 20, no. 20, p. 1-18. ISSN: 1424-8220.
[citace_rtf] =>
[citace_bibtex] => @article{BUT165594,
author="Ondřej {Rubeš} and Zdeněk {Machů} and Oldřich {Ševeček} and Zdeněk {Hadaš}",
title="Crack Protective Layered Architecture of Lead-Free Piezoelectric Energy Harvester in Bistable Configuration",
journal="SENSORS",
year="2020",
volume="20",
number="20",
pages="1--18",
doi="10.3390/s20205808",
url="https://www.mdpi.com/1424-8220/20/20/5808"
}
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[nazev_en] => Crack Protective Layered Architecture of Lead-Free Piezoelectric Energy Harvester in Bistable Configuration
[popis_en] => Kinetic piezoelectric energy harvesters are used to power up ultra-low power devices without batteries as an alternative and eco-friendly source of energy. This paper deals with a novel design of a lead-free multilayer energy harvester based on BaTiO3 ceramics. This material is very brittle and might be cracked in small amplitudes of oscillations. However, the main aim of our development is the design of a crack protective layered architecture that protects an energy harvesting device in very high amplitudes of oscillations. This architecture is described and optimized for chosen geometry and the resulted one degree of freedom coupled electromechanical model is derived. This model could be used in bistable configuration and the model is extended about the nonlinear stiffness produced by auxiliary magnets. The complex bistable vibration energy harvester is simulated to predict operation in a wide range of frequency excitation. It should demonstrate typical operation of designed beam and a stress intensity factor was calculated for layers. The whole system, without presence of cracks, was simulated with an excitation acceleration of amplitude up to 1g. The maximal obtained power was around 2 mW at the frequency around 40 Hz with a maximal tip displacement 7.5 mm. The maximal operating amplitude of this novel design was calculated around 10 mm which is 10-times higher than without protective layers.
[klicova_slova_en] => energy harvesting; piezoelectrics; bimorph; lead free ceramic; bistable energy harvester; nonlinear resonators
[vysledek_datum] => 2020-10-14T00:00:00+02:00
)
[7] => Array
(
[vysledek_id] => 165769
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[nazev] => Consideration of stiffness of wall layers is decisive for patient-specific analysis of carotid artery with atheroma
[nazev_orig] => Consideration of stiffness of wall layers is decisive for patient-specific analysis of carotid artery with atheroma
[duvernost_udaju_id] => S
[popis] => The paper deals with the impact of chosen geometric and material factors on maximal stresses in carotid atherosclerotic plaque calculated using patient-specific finite element models. These stresses are believed to be decisive for the plaque vulnerability but all applied models suffer from inaccuracy of input data, especially when obtainedin vivoonly. One hundred computational models based onex vivoMRI are used to investigate the impact of wall thickness, MRI slice thickness, lipid core and fibrous tissue stiffness, and media anisotropy on the calculated peak plaque and peak cap stresses. The investigated factors are taken as continuous in the range based on published experimental results, only the impact of anisotropy is evaluated by comparison with a corresponding isotropic model. Design of Experiment concept is applied to assess the statistical significance of these investigated factors representing uncertainties in the input data of the model. The results show that consideration of realistic properties of arterial wall in the model is decisive for the stress evaluation; assignment of properties of fibrous tissue even to media and adventitia layers as done in some studies may induce up to eightfold overestimation of peak stress. The impact of MRI slice thickness may play a key role when local thin fibrous cap is present. Anisotropy of media layer is insignificant, and the stiffness of fibrous tissue and lipid core may become significant in some combinations.
[popis_orig] => The paper deals with the impact of chosen geometric and material factors on maximal stresses in carotid atherosclerotic plaque calculated using patient-specific finite element models. These stresses are believed to be decisive for the plaque vulnerability but all applied models suffer from inaccuracy of input data, especially when obtainedin vivoonly. One hundred computational models based onex vivoMRI are used to investigate the impact of wall thickness, MRI slice thickness, lipid core and fibrous tissue stiffness, and media anisotropy on the calculated peak plaque and peak cap stresses. The investigated factors are taken as continuous in the range based on published experimental results, only the impact of anisotropy is evaluated by comparison with a corresponding isotropic model. Design of Experiment concept is applied to assess the statistical significance of these investigated factors representing uncertainties in the input data of the model. The results show that consideration of realistic properties of arterial wall in the model is decisive for the stress evaluation; assignment of properties of fibrous tissue even to media and adventitia layers as done in some studies may induce up to eightfold overestimation of peak stress. The impact of MRI slice thickness may play a key role when local thin fibrous cap is present. Anisotropy of media layer is insignificant, and the stiffness of fibrous tissue and lipid core may become significant in some combinations.
[klicova_slova] => BIAXIAL MECHANICAL-PROPERTIES; FIBROUS CAP THICKNESS; IN-VIVO; ATHEROSCLEROTIC PLAQUES; STRESS; MODEL; MICROCALCIFICATIONS; RESOLUTION; STRAIN; INTACT
[klicova_slova_orig] => BIAXIAL MECHANICAL-PROPERTIES; FIBROUS CAP THICKNESS; IN-VIVO; ATHEROSCLEROTIC PLAQUES; STRESS; MODEL; MICROCALCIFICATIONS; RESOLUTION; STRAIN; INTACT
[url] => https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0239447
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[vycet_osob] => LISICKÝ, O.; MALÁ, A.; BEDNAŘÍK, Z.; NOVOTNÝ, T.; BURŠA, J.
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[citace_text] => LISICKÝ, O.; MALÁ, A.; BEDNAŘÍK, Z.; NOVOTNÝ, T.; BURŠA, J. Consideration of stiffness of wall layers is decisive for patient-specific analysis of carotid artery with atheroma. PLoS One, 2020, vol. 15, no. 9, p. 1-18. ISSN: 1932-6203.
[citace_html] => LISICKÝ, O.; MALÁ, A.; BEDNAŘÍK, Z.; NOVOTNÝ, T.; BURŠA, J. Consideration of stiffness of wall layers is decisive for patient-specific analysis of carotid artery with atheroma. PLoS One, 2020, vol. 15, no. 9, p. 1-18. ISSN: 1932-6203.
[citace_rtf] =>
[citace_bibtex] => @article{BUT165769,
author="Ondřej {Lisický} and Aneta {Malá} and Zdeněk {Bednařík} and Tomáš {Novotný} and Jiří {Burša}",
title="Consideration of stiffness of wall layers is decisive for patient-specific analysis of carotid artery with atheroma",
journal="PLoS One",
year="2020",
volume="15",
number="9",
pages="1--18",
doi="10.1371/journal.pone.0239447",
issn="1932-6203",
url="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0239447"
}
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[nazev_en] => Consideration of stiffness of wall layers is decisive for patient-specific analysis of carotid artery with atheroma
[popis_en] => The paper deals with the impact of chosen geometric and material factors on maximal stresses in carotid atherosclerotic plaque calculated using patient-specific finite element models. These stresses are believed to be decisive for the plaque vulnerability but all applied models suffer from inaccuracy of input data, especially when obtainedin vivoonly. One hundred computational models based onex vivoMRI are used to investigate the impact of wall thickness, MRI slice thickness, lipid core and fibrous tissue stiffness, and media anisotropy on the calculated peak plaque and peak cap stresses. The investigated factors are taken as continuous in the range based on published experimental results, only the impact of anisotropy is evaluated by comparison with a corresponding isotropic model. Design of Experiment concept is applied to assess the statistical significance of these investigated factors representing uncertainties in the input data of the model. The results show that consideration of realistic properties of arterial wall in the model is decisive for the stress evaluation; assignment of properties of fibrous tissue even to media and adventitia layers as done in some studies may induce up to eightfold overestimation of peak stress. The impact of MRI slice thickness may play a key role when local thin fibrous cap is present. Anisotropy of media layer is insignificant, and the stiffness of fibrous tissue and lipid core may become significant in some combinations.
[klicova_slova_en] => BIAXIAL MECHANICAL-PROPERTIES; FIBROUS CAP THICKNESS; IN-VIVO; ATHEROSCLEROTIC PLAQUES; STRESS; MODEL; MICROCALCIFICATIONS; RESOLUTION; STRAIN; INTACT
[vysledek_datum] => 2020-09-29T00:00:00+02:00
)
[8] => Array
(
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[nazev] => FEM simulation of the nanoindentation test with rigid and non-rigid indenter
[nazev_orig] => FEM simulation of the nanoindentation test with rigid and non-rigid indenter
[duvernost_udaju_id] => S
[popis] => This paper focuses on the comparing of the results of the FEM simulations of fused silica nanoindentation tests. Fused silica is modelled like bilinear elasto-plastic material with the parameters estimated from the experiment. FEM simulations are made with the 2D axisymmetric conical indenter which is equivalent to the Berkovich indenter and the indentation curves are evaluated. The FEM simulations were made with the rigid and the non-rigid indenter and the difference between the indentation curves obtained with these models is assessed. The evaluated indentation curves are compared with the indentation curves obtained from the experiment.
[popis_orig] => This paper focuses on the comparing of the results of the FEM simulations of fused silica nanoindentation tests. Fused silica is modelled like bilinear elasto-plastic material with the parameters estimated from the experiment. FEM simulations are made with the 2D axisymmetric conical indenter which is equivalent to the Berkovich indenter and the indentation curves are evaluated. The FEM simulations were made with the rigid and the non-rigid indenter and the difference between the indentation curves obtained with these models is assessed. The evaluated indentation curves are compared with the indentation curves obtained from the experiment.
[klicova_slova] => Nanoindentation, Conical indenter, Silica, FEM
[klicova_slova_orig] => Nanoindentation, Conical indenter, Silica, FEM
[url] =>
[oecd_obor_id] => 20302
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[nadrazena_soucast_zkratka] => FME
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[upd_ts] => 2025-09-22
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[identifikator] => ISBN 978-80-87012-71-0 ISSN 1805-8248
[identifikator_popis] => ISBN - Engineering mechanics 2019 ISSN - Engineering Mechanics (CZ)
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[citace_text] => KOVÁŘ, J.; FUIS, V. FEM simulation of the nanoindentation test with rigid and non-rigid indenter. In Engineering mechanics 2019. Engineering Mechanics. Praha: Institute of Thermomechanics of the Czech Academy of Sciences, 2019. no. 1, p. 189-192. ISBN: 978-80-87012-71-0. ISSN: 1805-8248.
[citace_html] => KOVÁŘ, J.; FUIS, V. FEM simulation of the nanoindentation test with rigid and non-rigid indenter. In Engineering mechanics 2019. Engineering Mechanics. Praha: Institute of Thermomechanics of the Czech Academy of Sciences, 2019. no. 1, p. 189-192. ISBN: 978-80-87012-71-0. ISSN: 1805-8248.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT166314,
author="Jaroslav {Kovář} and Vladimír {Fuis}",
title="FEM simulation of the nanoindentation test with rigid and non-rigid indenter",
booktitle="Engineering mechanics 2019",
year="2019",
journal="Engineering Mechanics",
volume="1",
number="1",
pages="189--192",
publisher="Institute of Thermomechanics of the Czech Academy of Sciences",
address="Praha",
isbn="978-80-87012-71-0",
issn="1805-8248"
}
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[poznamka_metriky] =>
[nazev_en] => FEM simulation of the nanoindentation test with rigid and non-rigid indenter
[popis_en] => This paper focuses on the comparing of the results of the FEM simulations of fused silica nanoindentation tests. Fused silica is modelled like bilinear elasto-plastic material with the parameters estimated from the experiment. FEM simulations are made with the 2D axisymmetric conical indenter which is equivalent to the Berkovich indenter and the indentation curves are evaluated. The FEM simulations were made with the rigid and the non-rigid indenter and the difference between the indentation curves obtained with these models is assessed. The evaluated indentation curves are compared with the indentation curves obtained from the experiment.
[klicova_slova_en] => Nanoindentation, Conical indenter, Silica, FEM
[vysledek_datum] => 2019-05-13T00:00:00+02:00
)
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(
[vysledek_id] => 166316
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[nazev] => Comparing the Results of Probability of Ceramic Head Fracture According to Weibull's Theory with Inclusion of One or Three Principal Stresses
[nazev_orig] => Comparing the Results of Probability of Ceramic Head Fracture According to Weibull's Theory with Inclusion of One or Three Principal Stresses
[duvernost_udaju_id] => S
[popis] => This paper focuses on the assessment of probability of ceramic head hip joint endoprothesis fracture.
The Weibull's weakest link theory with inclusion of one or all three principal stresses was used for calculations of probability of failure and the results were compared. The test of head of the hip joint endoprothesis according to ISO 7206 was modelled. Three variants were considered. In the first variant, the head of hip joint endoprothesis ended up without any imperfections from ideal geometry. In other two variants, the ceramic head had shape imperfection from nominal conicity. Principal stresses needed for the calculation of probability of failure were calculated by finite element method. The results with the use of linear and quadratic solid elements were compared and better option was chosen for the next calculations. The influence of allowed penetration, density of the mesh on the results of stresses and probability of failure was assessed. The Gaussian quadrature of 13th order was used for integration over the surface of unit hemisphere in space of principal stresses which was needed for computation of probability of failure with inclusion of all principal stresses. The influence of imperfection from nominal conicity on probability of failure of the head hip joint endoprothesis was calculated and the relative difference between the results of Weibull's weakest link theory with the inclusion of one or all three principal stressed was analyzed.
[popis_orig] => This paper focuses on the assessment of probability of ceramic head hip joint endoprothesis fracture.
The Weibull's weakest link theory with inclusion of one or all three principal stresses was used for calculations of probability of failure and the results were compared. The test of head of the hip joint endoprothesis according to ISO 7206 was modelled. Three variants were considered. In the first variant, the head of hip joint endoprothesis ended up without any imperfections from ideal geometry. In other two variants, the ceramic head had shape imperfection from nominal conicity. Principal stresses needed for the calculation of probability of failure were calculated by finite element method. The results with the use of linear and quadratic solid elements were compared and better option was chosen for the next calculations. The influence of allowed penetration, density of the mesh on the results of stresses and probability of failure was assessed. The Gaussian quadrature of 13th order was used for integration over the surface of unit hemisphere in space of principal stresses which was needed for computation of probability of failure with inclusion of all principal stresses. The influence of imperfection from nominal conicity on probability of failure of the head hip joint endoprothesis was calculated and the relative difference between the results of Weibull's weakest link theory with the inclusion of one or all three principal stressed was analyzed.
[klicova_slova] => ceramic; Weibull's weakest link theory; probability of failure; Gaussian quadrature; head of hip joint
endoprothesis; sensors; measurement
[klicova_slova_orig] => ceramic; Weibull's weakest link theory; probability of failure; Gaussian quadrature; head of hip joint
endoprothesis; sensors; measurement
[url] =>
[oecd_obor_id] => 20302
[odpovedny_utvar_id] => 157
[odpovedny_utvar_nazev] => Institute of Solid Mechanics, Mechatronics and Biomechanics
[odpovedny_utvar_zkratka] => ISMMB
[nadrazena_soucast_id] => 4
[nadrazena_soucast_zkratka] => FME
[nadrazena_soucast_nazev] => Faculty of Mechanical Engineering
[originalni_jazyk] => en
[schvalil_id] => 160811
[schvaleno] => 2020-12-03
[vykazovat_riv] => 1
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[vycet_osob] => KOVÁŘ, J.; FUIS, V.
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[kategorie_nazev] => Publication results
[druh_nazev] => Paper in proceedings (conference paper)
[druh_popis] => Paper in proceedings (conference paper)
[stav] => Approved
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[upravil] => Informační systém Automat
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[upd_uid] => 999999
[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[identifikator] => ISBN 9788021455429
[identifikator_popis] => ISBN - 18th Mechatronika 2018 : proceedings of the 2018 18th International Conference on Mechatronics - Mechatronika (ME) 2018 : Brno, Czech Republic, December 5-7, 2018
[riv_dodavka_id] => 2549
[riv_dodavka_oznaceni] => RIV21-MSM-26210___
[riv_dodavka_rok] => 2021
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[citace_text] => KOVÁŘ, J.; FUIS, V. Comparing the Results of Probability of Ceramic Head Fracture According to Weibull's Theory with Inclusion of One or Three Principal Stresses. In 18th Mechatronika 2018 : proceedings of the 2018 18th International Conference on Mechatronics - Mechatronika (ME) 2018 : Brno, Czech Republic, December 5-7, 2018. Brno: 2018. p. 453-460. ISBN: 9788021455429.
[citace_html] => KOVÁŘ, J.; FUIS, V. Comparing the Results of Probability of Ceramic Head Fracture According to Weibull's Theory with Inclusion of One or Three Principal Stresses. In 18th Mechatronika 2018 : proceedings of the 2018 18th International Conference on Mechatronics - Mechatronika (ME) 2018 : Brno, Czech Republic, December 5-7, 2018. Brno: 2018. p. 453-460. ISBN: 9788021455429.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT166316,
author="Jaroslav {Kovář} and Vladimír {Fuis}",
title="Comparing the Results of Probability of Ceramic Head Fracture According to Weibull's Theory with Inclusion of One or Three Principal Stresses",
booktitle="18th Mechatronika 2018 : proceedings of the 2018 18th International Conference on Mechatronics - Mechatronika (ME) 2018 : Brno, Czech Republic, December 5-7, 2018",
year="2018",
pages="453--460",
address="Brno",
isbn="9788021455429"
}
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[nazev_en] => Comparing the Results of Probability of Ceramic Head Fracture According to Weibull's Theory with Inclusion of One or Three Principal Stresses
[popis_en] => This paper focuses on the assessment of probability of ceramic head hip joint endoprothesis fracture.
The Weibull's weakest link theory with inclusion of one or all three principal stresses was used for calculations of probability of failure and the results were compared. The test of head of the hip joint endoprothesis according to ISO 7206 was modelled. Three variants were considered. In the first variant, the head of hip joint endoprothesis ended up without any imperfections from ideal geometry. In other two variants, the ceramic head had shape imperfection from nominal conicity. Principal stresses needed for the calculation of probability of failure were calculated by finite element method. The results with the use of linear and quadratic solid elements were compared and better option was chosen for the next calculations. The influence of allowed penetration, density of the mesh on the results of stresses and probability of failure was assessed. The Gaussian quadrature of 13th order was used for integration over the surface of unit hemisphere in space of principal stresses which was needed for computation of probability of failure with inclusion of all principal stresses. The influence of imperfection from nominal conicity on probability of failure of the head hip joint endoprothesis was calculated and the relative difference between the results of Weibull's weakest link theory with the inclusion of one or all three principal stressed was analyzed.
[klicova_slova_en] => ceramic; Weibull's weakest link theory; probability of failure; Gaussian quadrature; head of hip joint
endoprothesis; sensors; measurement
[vysledek_datum] => 2018-12-05T00:00:00+01:00
)
[10] => Array
(
[vysledek_id] => 166380
[vysledek_druh_id] => ARTWOS
[ex_vysledek_id] => 138076
[vysledek_rok] => 2021
[nazev] => Failure properties of abdominal aortic aneurysm tissue are orientation dependent
[nazev_orig] => Failure properties of abdominal aortic aneurysm tissue are orientation dependent
[duvernost_udaju_id] => S
[popis] => Introduction: Biomechanical rupture risk assessment of abdominal aortic aneurysm (AAA) requires information about failure properties of aneurysmal tissue. There are large differences between reported values. Among others, studies vary in using either axially or circumferentially oriented samples. This study investigates the effect of sample orientation on failure properties.
Methods: Aneurysmal tissues from 45 patients (11 females) were harvested during open AAA repair, cut into uniaxial samples (90) and tested mechanically within 3 h. If possible, the samples were cut in both axial (49 samples) and circumferential (41 samples) directions. Wall thickness, First Piola-Kirchhoff strength P-ult and ultimate tension T-ult were recorded. Influence of sample orientation and other clinical parameters were investigated using non parametric tests.
Results: Medians of Pull (values 1100 kPa for circumferential vs. 715 kPa for axial direction, p < 10(-4)) and T-ult (17.4 N/cm in circumferential vs. 11.2 N/cm in axial direction, p < 10(-4)) were significantly higher in circumferential direction. For paired data, the median of difference was 411 kPa (p < 10(-3)) in P-ult, and 7.4 N/cm < 10(-4)) in T-ult in favor of circumferential direction.
Conclusions: In this first study of anisotropy in AAA wall failure properties using paired comparisons, the strength in circumferential orientation was found to be higher than in axial orientation.
[popis_orig] => Introduction: Biomechanical rupture risk assessment of abdominal aortic aneurysm (AAA) requires information about failure properties of aneurysmal tissue. There are large differences between reported values. Among others, studies vary in using either axially or circumferentially oriented samples. This study investigates the effect of sample orientation on failure properties.
Methods: Aneurysmal tissues from 45 patients (11 females) were harvested during open AAA repair, cut into uniaxial samples (90) and tested mechanically within 3 h. If possible, the samples were cut in both axial (49 samples) and circumferential (41 samples) directions. Wall thickness, First Piola-Kirchhoff strength P-ult and ultimate tension T-ult were recorded. Influence of sample orientation and other clinical parameters were investigated using non parametric tests.
Results: Medians of Pull (values 1100 kPa for circumferential vs. 715 kPa for axial direction, p < 10(-4)) and T-ult (17.4 N/cm in circumferential vs. 11.2 N/cm in axial direction, p < 10(-4)) were significantly higher in circumferential direction. For paired data, the median of difference was 411 kPa (p < 10(-3)) in P-ult, and 7.4 N/cm < 10(-4)) in T-ult in favor of circumferential direction.
Conclusions: In this first study of anisotropy in AAA wall failure properties using paired comparisons, the strength in circumferential orientation was found to be higher than in axial orientation.
[klicova_slova] => Abdominal aortic aneurysm, Failure properties, Mechanical testing, Sample orientation
[klicova_slova_orig] => Abdominal aortic aneurysm, Failure properties, Mechanical testing, Sample orientation
[url] => https://www-sciencedirect-com.ezproxy.lib.vutbr.cz/science/article/pii/S1751616120307232
[oecd_obor_id] => 20602
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[nadrazena_soucast_zkratka] => FME
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[originalni_jazyk] => en
[schvalil_id] => 107598
[schvaleno] => 2022-03-17
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[slozka_id] =>
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[vycet_osob] => POLZER, S.; MAN, V.; VLACHOVSKÝ, R.; KUBÍČEK, L.; KRACÍK, J.; STAFFA, R.; NOVOTNÝ, T.; BURŠA, J.; RAGHAVAN, M.
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[identifikator] => ISSN 1751-6161
[identifikator_popis] => ISSN - Journal of the Mechanical Behavior of Biomedical Materials (NL)
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[riv_dodavka_oznaceni] => RIV21-MSM-26210___
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[citace_text] => POLZER, S.; MAN, V.; VLACHOVSKÝ, R.; KUBÍČEK, L.; KRACÍK, J.; STAFFA, R.; NOVOTNÝ, T.; BURŠA, J.; RAGHAVAN, M. Failure properties of abdominal aortic aneurysm tissue are orientation dependent. Journal of the Mechanical Behavior of Biomedical Materials, 2021, vol. 114, no. 1, p. 1-7. ISSN: 1751-6161.
[citace_html] => POLZER, S.; MAN, V.; VLACHOVSKÝ, R.; KUBÍČEK, L.; KRACÍK, J.; STAFFA, R.; NOVOTNÝ, T.; BURŠA, J.; RAGHAVAN, M. Failure properties of abdominal aortic aneurysm tissue are orientation dependent. Journal of the Mechanical Behavior of Biomedical Materials, 2021, vol. 114, no. 1, p. 1-7. ISSN: 1751-6161.
[citace_rtf] =>
[citace_bibtex] => @article{BUT166380,
author="Stanislav {Polzer} and Vojtěch {Man} and Robert {Vlachovský} and Luboš {Kubíček} and Jan {Kracík} and Robert {Staffa} and Tomáš {Novotný} and Jiří {Burša} and Madhavan Lakshmi {Raghavan}",
title="Failure properties of abdominal aortic aneurysm tissue are orientation dependent",
journal="Journal of the Mechanical Behavior of Biomedical Materials",
year="2021",
volume="114",
number="1",
pages="1--7",
doi="10.1016/j.jmbbm.2020.104181",
issn="1751-6161",
url="https://www-sciencedirect-com.ezproxy.lib.vutbr.cz/science/article/pii/S1751616120307232"
}
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[nazev_en] => Failure properties of abdominal aortic aneurysm tissue are orientation dependent
[popis_en] => Introduction: Biomechanical rupture risk assessment of abdominal aortic aneurysm (AAA) requires information about failure properties of aneurysmal tissue. There are large differences between reported values. Among others, studies vary in using either axially or circumferentially oriented samples. This study investigates the effect of sample orientation on failure properties.
Methods: Aneurysmal tissues from 45 patients (11 females) were harvested during open AAA repair, cut into uniaxial samples (90) and tested mechanically within 3 h. If possible, the samples were cut in both axial (49 samples) and circumferential (41 samples) directions. Wall thickness, First Piola-Kirchhoff strength P-ult and ultimate tension T-ult were recorded. Influence of sample orientation and other clinical parameters were investigated using non parametric tests.
Results: Medians of Pull (values 1100 kPa for circumferential vs. 715 kPa for axial direction, p < 10(-4)) and T-ult (17.4 N/cm in circumferential vs. 11.2 N/cm in axial direction, p < 10(-4)) were significantly higher in circumferential direction. For paired data, the median of difference was 411 kPa (p < 10(-3)) in P-ult, and 7.4 N/cm < 10(-4)) in T-ult in favor of circumferential direction.
Conclusions: In this first study of anisotropy in AAA wall failure properties using paired comparisons, the strength in circumferential orientation was found to be higher than in axial orientation.
[klicova_slova_en] => Abdominal aortic aneurysm, Failure properties, Mechanical testing, Sample orientation
[vysledek_datum] => 2021-02-01T00:00:00+01:00
)
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[citace_text] => HOUFEK, L.; FUIS, V.: Virtuální dvojče uložení strojního celku na pohybovém šroubu. URL: http://www.umt.fme.vutbr.cz/images/projekty/TN01000071_02-V15_popis.pdf. (Funkční vzorek)
[citace_html] => HOUFEK, L.; FUIS, V.: Virtuální dvojče uložení strojního celku na pohybovém šroubu. URL: http://www.umt.fme.vutbr.cz/images/projekty/TN01000071_02-V15_popis.pdf. (Funkční vzorek)
[citace_rtf] =>
[citace_bibtex] => @misc{BUT166398,
author="Lubomír {Houfek} and Vladimír {Fuis}",
title="Virtuální dvojče uložení strojního celku na pohybovém šroubu",
year="2020",
url="http://www.umt.fme.vutbr.cz/images/projekty/TN01000071_02-V15_popis.pdf",
note="Functioning sample"
}
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[oecd_tree_podobor_nazev] => Applied mechanics
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[nazev_en] => Virtual twin bearing machine on the moving screw
[popis_en] => The virtual twin bearing of the machine unit on the moving screw serves to improve the machining process by changing the stiffness at the bezel.
[klicova_slova_en] => virtual twin
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[quotations] => HOUFEK, L.; FUIS, V.
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