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[nazev] => Design Concept and Test Results of Electromechanical Metamaterial Structure for Sensing and Energy Harvesting Applications
[nazev_orig] => Design Concept and Test Results of Electromechanical Metamaterial Structure for Sensing and Energy Harvesting Applications
[duvernost_udaju_id] => S
[popis] => This paper deals with the design concept of metamaterial structure for sensing and energy harvesting applications. The paper offers a novel design of an auxetic structure with an integrated smart material that gives this structure additional capabilities. The proposed concept uses additive technology for manufacturing metal structures and embedded piezoceramic elements. The ability to function as a construction part, sensor, actuator, energy harvester or all is very attractive. This paper presents a mechanical design and experiments of a metamaterial structure that is utilized for energy harvesting, sensing, and active damping applications. Its ability to generate usable electric power and sense vibrations within the structure presents an opportunity for further research, especially in terms of scalability and feasibility study for specific applications.
[popis_orig] => This paper deals with the design concept of metamaterial structure for sensing and energy harvesting applications. The paper offers a novel design of an auxetic structure with an integrated smart material that gives this structure additional capabilities. The proposed concept uses additive technology for manufacturing metal structures and embedded piezoceramic elements. The ability to function as a construction part, sensor, actuator, energy harvester or all is very attractive. This paper presents a mechanical design and experiments of a metamaterial structure that is utilized for energy harvesting, sensing, and active damping applications. Its ability to generate usable electric power and sense vibrations within the structure presents an opportunity for further research, especially in terms of scalability and feasibility study for specific applications.
[klicova_slova] => energy harvesting, additive manufacturing, auxetic structure, PZT, vibration
[klicova_slova_orig] => energy harvesting, additive manufacturing, auxetic structure, PZT, vibration
[url] => https://ieeexplore.ieee.org/document/9983153
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[citace_text] => HADAŠ, Z.; SLABÝ, V.; BAJER, J.; FILKOVÁ, A.; KŠICA, F.; MARCIÁN, P. Design Concept and Test Results of Electromechanical Metamaterial Structure for Sensing and Energy Harvesting Applications. In Proceedings of the 2022 20th International Conference on Mechatronics - Mechatronika (ME). Pilsen: IEEE, 2022. 6 p. ISBN: 978-1-6654-1040-3.
[citace_html] => HADAŠ, Z.; SLABÝ, V.; BAJER, J.; FILKOVÁ, A.; KŠICA, F.; MARCIÁN, P. Design Concept and Test Results of Electromechanical Metamaterial Structure for Sensing and Energy Harvesting Applications. In Proceedings of the 2022 20th International Conference on Mechatronics - Mechatronika (ME). Pilsen: IEEE, 2022. 6 p. ISBN: 978-1-6654-1040-3.
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author="Zdeněk {Hadaš} and Vojtěch {Slabý} and Jan {Bajer} and Alena {Filková} and Filip {Kšica} and Petr {Marcián}",
title="Design Concept and Test Results of Electromechanical Metamaterial Structure for Sensing and Energy Harvesting Applications",
booktitle="Proceedings of the 2022 20th International Conference on Mechatronics - Mechatronika (ME)",
year="2022",
pages="6",
publisher="IEEE",
address="Pilsen",
doi="10.1109/ME54704.2022.9983153",
isbn="978-1-6654-1040-3",
url="https://ieeexplore.ieee.org/document/9983153"
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[nazev_en] => Design Concept and Test Results of Electromechanical Metamaterial Structure for Sensing and Energy Harvesting Applications
[popis_en] => This paper deals with the design concept of metamaterial structure for sensing and energy harvesting applications. The paper offers a novel design of an auxetic structure with an integrated smart material that gives this structure additional capabilities. The proposed concept uses additive technology for manufacturing metal structures and embedded piezoceramic elements. The ability to function as a construction part, sensor, actuator, energy harvester or all is very attractive. This paper presents a mechanical design and experiments of a metamaterial structure that is utilized for energy harvesting, sensing, and active damping applications. Its ability to generate usable electric power and sense vibrations within the structure presents an opportunity for further research, especially in terms of scalability and feasibility study for specific applications.
[klicova_slova_en] => energy harvesting, additive manufacturing, auxetic structure, PZT, vibration
[vysledek_datum] => 2022-12-07T00:00:00+01:00
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[nazev] => Electromagnetic Trackside Vibration Energy Harvester with Cantilever Beams Spring
[nazev_orig] => Electromagnetic Trackside Vibration Energy Harvester with Cantilever Beams Spring
[duvernost_udaju_id] => S
[popis] => Railway tracks are a great source of vibrations and need to be monitored. These vibrations could be converted to electric energy with an energy harvester, and it could be used as source of energy for autonomous trackside monitoring systems. This paper analyses acceleration data from one specific railway with different passing trains. This analysis brings requirements for a vibration energy harvester. The novel concept of an electromagnetic vibration energy harvester with cantilever beam spring is designed to achieve the set requirements. This concept is cheaper and easier for fabrication and could reach higher frequencies than the traditional concept with magnetic spring. Finally, the fabrication and experimental validation demonstrate the functionality of the designed energy harvester.
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[klicova_slova] => Energy Harvester, Electromagnetics, Cantilever, Stiffness, Power Estimation, Railways
[klicova_slova_orig] => Energy Harvester, Electromagnetics, Cantilever, Stiffness, Power Estimation, Railways
[url] => https://ieeexplore.ieee.org/document/9982908
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[citace_text] => RUBEŠ, O.; BEŇO, M.; SOSNA, P.; HADAŠ, Z. Electromagnetic Trackside Vibration Energy Harvester with Cantilever Beams Spring. In Proceedings of the 2022 20th International Conference on Mechatronics - Mechatronika (ME). Pilsen: IEEE, 2022. 5 p. ISBN: 978-1-6654-1040-3.
[citace_html] => RUBEŠ, O.; BEŇO, M.; SOSNA, P.; HADAŠ, Z. Electromagnetic Trackside Vibration Energy Harvester with Cantilever Beams Spring. In Proceedings of the 2022 20th International Conference on Mechatronics - Mechatronika (ME). Pilsen: IEEE, 2022. 5 p. ISBN: 978-1-6654-1040-3.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT181451,
author="Ondřej {Rubeš} and Martin {Beňo} and Petr {Sosna} and Zdeněk {Hadaš}",
title="Electromagnetic Trackside Vibration Energy Harvester with Cantilever Beams Spring",
booktitle="Proceedings of the 2022 20th International Conference on Mechatronics - Mechatronika (ME)",
year="2022",
pages="5",
publisher="IEEE",
address="Pilsen",
doi="10.1109/ME54704.2022.9982908",
isbn="978-1-6654-1040-3",
url="https://ieeexplore.ieee.org/document/9982908"
}
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[nazev_en] => Electromagnetic Trackside Vibration Energy Harvester with Cantilever Beams Spring
[popis_en] => Railway tracks are a great source of vibrations and need to be monitored. These vibrations could be converted to electric energy with an energy harvester, and it could be used as source of energy for autonomous trackside monitoring systems. This paper analyses acceleration data from one specific railway with different passing trains. This analysis brings requirements for a vibration energy harvester. The novel concept of an electromagnetic vibration energy harvester with cantilever beam spring is designed to achieve the set requirements. This concept is cheaper and easier for fabrication and could reach higher frequencies than the traditional concept with magnetic spring. Finally, the fabrication and experimental validation demonstrate the functionality of the designed energy harvester.
[klicova_slova_en] => Energy Harvester, Electromagnetics, Cantilever, Stiffness, Power Estimation, Railways
[vysledek_datum] => 2022-12-07T00:00:00+01:00
)
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[nazev] => Passing Train as Source of Energy for Autonomous LoRa Monitoring System
[nazev_orig] => Passing Train as Source of Energy for Autonomous LoRa Monitoring System
[duvernost_udaju_id] => S
[popis] => This paper deals with a concept of an autonomous railway monitoring system with
energy harvesting source of electric energy. There are several ambient sources of
energy on trackside which could be converted into useful electricity for autonomous
sensors and electronics. A waste energy of passing train is occurred in form of a rail
and sleeper mechanical vibrations. The kinetic energy of mechanical vibration could
be transformed into useful electricity in time of passing trains. The presented kinetic
energy harvesting device could provide autonomous source of energy for sensing and
communication modules. The lab test of energy harvesting device and the autonomous
operation of sensing system with communication is presented. The presented system
was successfully tested with LoRa module, which could operate for a distance of a
few kilometres, and it could transfer information about track condition or dynamic
load, e.g. axle counting or vibration monitoring.
[popis_orig] => This paper deals with a concept of an autonomous railway monitoring system with
energy harvesting source of electric energy. There are several ambient sources of
energy on trackside which could be converted into useful electricity for autonomous
sensors and electronics. A waste energy of passing train is occurred in form of a rail
and sleeper mechanical vibrations. The kinetic energy of mechanical vibration could
be transformed into useful electricity in time of passing trains. The presented kinetic
energy harvesting device could provide autonomous source of energy for sensing and
communication modules. The lab test of energy harvesting device and the autonomous
operation of sensing system with communication is presented. The presented system
was successfully tested with LoRa module, which could operate for a distance of a
few kilometres, and it could transfer information about track condition or dynamic
load, e.g. axle counting or vibration monitoring.
[klicova_slova] => Trackside, Vibration, Sensing, Energy Harvesting, Communication.
[klicova_slova_orig] => Trackside, Vibration, Sensing, Energy Harvesting, Communication.
[url] =>
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[schvalil_id] => 11599
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[vycet_osob] => HADAŠ, Z.; RUBEŠ, O.; KŠICA, F.; MAJER, Z.; MONCMAN, M.; CHALUPA, J.
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[citace_text] => HADAŠ, Z.; RUBEŠ, O.; KŠICA, F.; MAJER, Z.; MONCMAN, M.; CHALUPA, J. Passing Train as Source of Energy for Autonomous LoRa Monitoring System. In Montpellier: Elsevier, 2022. 8 p.
[citace_html] => HADAŠ, Z.; RUBEŠ, O.; KŠICA, F.; MAJER, Z.; MONCMAN, M.; CHALUPA, J. Passing Train as Source of Energy for Autonomous LoRa Monitoring System. In Montpellier: Elsevier, 2022. 8 p.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT181485,
author="Zdeněk {Hadaš} and Ondřej {Rubeš} and Filip {Kšica} and Zdeněk {Majer} and Marek {Moncman} and Jan {Chalupa}",
title="Passing Train as Source of Energy for Autonomous LoRa Monitoring System",
year="2022",
pages="8",
publisher="Elsevier",
address="Montpellier"
}
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[nazev_en] => Passing Train as Source of Energy for Autonomous LoRa Monitoring System
[popis_en] => This paper deals with a concept of an autonomous railway monitoring system with
energy harvesting source of electric energy. There are several ambient sources of
energy on trackside which could be converted into useful electricity for autonomous
sensors and electronics. A waste energy of passing train is occurred in form of a rail
and sleeper mechanical vibrations. The kinetic energy of mechanical vibration could
be transformed into useful electricity in time of passing trains. The presented kinetic
energy harvesting device could provide autonomous source of energy for sensing and
communication modules. The lab test of energy harvesting device and the autonomous
operation of sensing system with communication is presented. The presented system
was successfully tested with LoRa module, which could operate for a distance of a
few kilometres, and it could transfer information about track condition or dynamic
load, e.g. axle counting or vibration monitoring.
[klicova_slova_en] => Trackside, Vibration, Sensing, Energy Harvesting, Communication.
[vysledek_datum] => 2022-08-22T00:00:00+02:00
)
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[nazev] => Determination Of Critical Length Parameter For Fatigue Lifetime Predictions Of Notched Specimens
[nazev_orig] => Determination Of Critical Length Parameter For Fatigue Lifetime Predictions Of Notched Specimens
[duvernost_udaju_id] => S
[popis] => The paper reviews the research results to date on critical length parameters of notched aluminum specimens with various notch radii. The Theory of Critical Distances (TCD) was applied in form of the Line Method for the determination of the critical length parameter. This parameter can be used for lifetime predictions of notched components. The output is a comparison of critical length parameters of specimens with various notch radii. Numerical calculations as well as experimentally obtained data were employed in the analysis. Fatigue experiments were performed at fatigue loading device working at ultrasonic frequency of 20 kHz. Thus we were able to reach very high number of cycles to failure.
[popis_orig] => The paper reviews the research results to date on critical length parameters of notched aluminum specimens with various notch radii. The Theory of Critical Distances (TCD) was applied in form of the Line Method for the determination of the critical length parameter. This parameter can be used for lifetime predictions of notched components. The output is a comparison of critical length parameters of specimens with various notch radii. Numerical calculations as well as experimentally obtained data were employed in the analysis. Fatigue experiments were performed at fatigue loading device working at ultrasonic frequency of 20 kHz. Thus we were able to reach very high number of cycles to failure.
[klicova_slova] => Critical length parameter, Wöhler curve, notches, Theory of Critical Distances, Line Method, lifetime predictions, fatigue, very high cycle fatigue.
[klicova_slova_orig] => Critical length parameter, Wöhler curve, notches, Theory of Critical Distances, Line Method, lifetime predictions, fatigue, very high cycle fatigue.
[url] => https://dspace.vsb.cz/handle/10084/149272
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[druh_popis] => Ostatní články v odborných recenzovaných periodicích splňující definici druhu výsledku
[stav] => Schválený
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[identifikator] => ISSN 1213-1962
[identifikator_popis] => ISSN - Sborník vědeckých prací Vysoké školy báňské – Technické univerzity Ostrava (CZ)
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[citace_text] => KOZÁKOVÁ K., KLUSÁK J. Determination Of Critical Length Parameter For Fatigue Lifetime Predictions Of Notched Specimens. Sborník vědeckých prací Vysoké školy báňské – Technické univerzity Ostrava, 2022, vol. 22, no. 2, p. 16-21. ISSN: 1213-1962.
[citace_html] => KOZÁKOVÁ K., KLUSÁK J. Determination Of Critical Length Parameter For Fatigue Lifetime Predictions Of Notched Specimens. Sborník vědeckých prací Vysoké školy báňské – Technické univerzity Ostrava, 2022, vol. 22, no. 2, p. 16-21. ISSN: 1213-1962.
[citace_rtf] =>
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author="Kamila {Kozáková} and Jan {Klusák}",
title="Determination Of Critical Length Parameter For Fatigue Lifetime Predictions Of Notched Specimens",
journal="Sborník vědeckých prací Vysoké školy báňské – Technické univerzity Ostrava",
year="2022",
volume="22",
number="2",
pages="16--21",
doi="10.35181/tces-2022-0009",
issn="1213-1962",
url="https://dspace.vsb.cz/handle/10084/149272"
}
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[nazev_en] => Determination Of Critical Length Parameter For Fatigue Lifetime Predictions Of Notched Specimens
[popis_en] => The paper reviews the research results to date on critical length parameters of notched aluminum specimens with various notch radii. The Theory of Critical Distances (TCD) was applied in form of the Line Method for the determination of the critical length parameter. This parameter can be used for lifetime predictions of notched components. The output is a comparison of critical length parameters of specimens with various notch radii. Numerical calculations as well as experimentally obtained data were employed in the analysis. Fatigue experiments were performed at fatigue loading device working at ultrasonic frequency of 20 kHz. Thus we were able to reach very high number of cycles to failure.
[klicova_slova_en] => Critical length parameter, Wöhler curve, notches, Theory of Critical Distances, Line Method, lifetime predictions, fatigue, very high cycle fatigue.
[vysledek_datum] => 2022-12-31T00:00:00+01:00
)
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[nazev] => Prediction of the fatigue life of notched specimens: The influence of the surface quality produced by machining
[nazev_orig] => Prediction of the fatigue life of notched specimens: The influence of the surface quality produced by machining
[duvernost_udaju_id] => S
[popis] => The article introduces a method for fatigue lifetime predictions of notched specimens. The method uses fracture stresses of smooth and notched specimens with notch radius r = 0.2 mm. These two sets of experimental data are evaluated with the knowledge of axial stress distributions of the notched specimens using average stress over a length parameter l. This parameter l is considered to be a material characteristic (depending on the number of cycles to failure) and can be used for lifetime predictions of notched specimens with various notch radii. The predictions are compared to experimental data and analyzed. There is a strong influence of the process of machining of notches, which can lead to fatigue failure earlier than predicted. The data are evaluated in the area of high cycle fatigue and gigacycle fatigue.
[popis_orig] => The article introduces a method for fatigue lifetime predictions of notched specimens. The method uses fracture stresses of smooth and notched specimens with notch radius r = 0.2 mm. These two sets of experimental data are evaluated with the knowledge of axial stress distributions of the notched specimens using average stress over a length parameter l. This parameter l is considered to be a material characteristic (depending on the number of cycles to failure) and can be used for lifetime predictions of notched specimens with various notch radii. The predictions are compared to experimental data and analyzed. There is a strong influence of the process of machining of notches, which can lead to fatigue failure earlier than predicted. The data are evaluated in the area of high cycle fatigue and gigacycle fatigue.
[klicova_slova] => notches; fatigue; lifetime predictions; length parameter; high cycle fatigue; gigacycle fatigue
[klicova_slova_orig] => notches; fatigue; lifetime predictions; length parameter; high cycle fatigue; gigacycle fatigue
[url] => https://www.sciencedirect.com/science/article/pii/S2452321622008186
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[citace_text] => KOZÁKOVÁ, K.; KLUSÁK, J. Prediction of the fatigue life of notched specimens: The influence of the surface quality produced by machining. In Materials Structure & Micromechanics of Fracture. Procedia Structural Integrity. Elsevier, 2023. no. 1, p. 178-183. ISSN: 2452-3216.
[citace_html] => KOZÁKOVÁ, K.; KLUSÁK, J. Prediction of the fatigue life of notched specimens: The influence of the surface quality produced by machining. In Materials Structure & Micromechanics of Fracture. Procedia Structural Integrity. Elsevier, 2023. no. 1, p. 178-183. ISSN: 2452-3216.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT182123,
author="Kamila {Kozáková} and Jan {Klusák}",
title="Prediction of the fatigue life of notched specimens: The influence of the surface quality produced by machining",
booktitle="Materials Structure & Micromechanics of Fracture",
year="2023",
journal="Procedia Structural Integrity",
volume="43",
number="1",
pages="178--183",
publisher="Elsevier",
doi="10.1016/j.prostr.2022.12.255",
url="https://www.sciencedirect.com/science/article/pii/S2452321622008186"
}
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[nazev_en] => Prediction of the fatigue life of notched specimens: The influence of the surface quality produced by machining
[popis_en] => The article introduces a method for fatigue lifetime predictions of notched specimens. The method uses fracture stresses of smooth and notched specimens with notch radius r = 0.2 mm. These two sets of experimental data are evaluated with the knowledge of axial stress distributions of the notched specimens using average stress over a length parameter l. This parameter l is considered to be a material characteristic (depending on the number of cycles to failure) and can be used for lifetime predictions of notched specimens with various notch radii. The predictions are compared to experimental data and analyzed. There is a strong influence of the process of machining of notches, which can lead to fatigue failure earlier than predicted. The data are evaluated in the area of high cycle fatigue and gigacycle fatigue.
[klicova_slova_en] => notches; fatigue; lifetime predictions; length parameter; high cycle fatigue; gigacycle fatigue
[vysledek_datum] => 2023-01-13T00:00:00+01:00
)
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(
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[nazev] => Fatigue behavior of DIN 1.4307 and DIN 1.4306 stainless steels under high frequency loading
[nazev_orig] => Fatigue behavior of DIN 1.4307 and DIN 1.4306 stainless steels under high frequency loading
[duvernost_udaju_id] => S
[popis] => Two stainless steels DIN 1.4307 and DIN 1.4306 were tested by an ultrasonic fatigue loading device under push-pull mode (stress ratio R = -1). Life-time curves were determined in the high and very high cycle fatigue regions. The time dependence of frequency was monitored and evaluated. At the beginning of the tests (up to 1 × 107 cycles), an increase of the frequency was observed, followed by a slow frequency decrease. It relates to changes of microstructure. No failure occurred in the region between 1 × 109 and 1 × 1010 cycles. The steel 1.4306 exhibits a higher fatigue life-time than the steel 1.4307. This is caused by the difference in the chemical composition of the two steels, namely by the higher nickel content in the 1.4306 steel.
[popis_orig] => Two stainless steels DIN 1.4307 and DIN 1.4306 were tested by an ultrasonic fatigue loading device under push-pull mode (stress ratio R = -1). Life-time curves were determined in the high and very high cycle fatigue regions. The time dependence of frequency was monitored and evaluated. At the beginning of the tests (up to 1 × 107 cycles), an increase of the frequency was observed, followed by a slow frequency decrease. It relates to changes of microstructure. No failure occurred in the region between 1 × 109 and 1 × 1010 cycles. The steel 1.4306 exhibits a higher fatigue life-time than the steel 1.4307. This is caused by the difference in the chemical composition of the two steels, namely by the higher nickel content in the 1.4306 steel.
[klicova_slova] => very high cyle fatigue; stainless steels; frequency changes; plastic deformation
[klicova_slova_orig] => very high cyle fatigue; stainless steels; frequency changes; plastic deformation
[url] => https://www.sciencedirect.com/science/article/pii/S2452321622008125
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[citace_text] => KLUSÁK, J.; KOZÁKOVÁ, K.; JAMBOR, M.; SEITL, S. Fatigue behavior of DIN 1.4307 and DIN 1.4306 stainless steels under high frequency loading. In Materials Structure & Micromechanics of Fracture. Procedia Structural Integrity. Elsevier, 2023. no. 1, p. 142-147. ISSN: 2452-3216.
[citace_html] => KLUSÁK, J.; KOZÁKOVÁ, K.; JAMBOR, M.; SEITL, S. Fatigue behavior of DIN 1.4307 and DIN 1.4306 stainless steels under high frequency loading. In Materials Structure & Micromechanics of Fracture. Procedia Structural Integrity. Elsevier, 2023. no. 1, p. 142-147. ISSN: 2452-3216.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT182139,
author="Jan {Klusák} and Kamila {Kozáková} and Michal {Jambor} and Stanislav {Seitl}",
title="Fatigue behavior of DIN 1.4307 and DIN 1.4306 stainless steels under high frequency loading",
booktitle="Materials Structure & Micromechanics of Fracture",
year="2023",
journal="Procedia Structural Integrity",
volume="43",
number="1",
pages="142--147",
publisher="Elsevier",
doi="10.1016/j.prostr.2022.12.249",
url="https://www.sciencedirect.com/science/article/pii/S2452321622008125"
}
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[nazev_en] => Fatigue behavior of DIN 1.4307 and DIN 1.4306 stainless steels under high frequency loading
[popis_en] => Two stainless steels DIN 1.4307 and DIN 1.4306 were tested by an ultrasonic fatigue loading device under push-pull mode (stress ratio R = -1). Life-time curves were determined in the high and very high cycle fatigue regions. The time dependence of frequency was monitored and evaluated. At the beginning of the tests (up to 1 × 107 cycles), an increase of the frequency was observed, followed by a slow frequency decrease. It relates to changes of microstructure. No failure occurred in the region between 1 × 109 and 1 × 1010 cycles. The steel 1.4306 exhibits a higher fatigue life-time than the steel 1.4307. This is caused by the difference in the chemical composition of the two steels, namely by the higher nickel content in the 1.4306 steel.
[klicova_slova_en] => very high cyle fatigue; stainless steels; frequency changes; plastic deformation
[vysledek_datum] => 2023-01-13T00:00:00+01:00
)
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(
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[nazev] => Fatigue life of notches: an effect of manufacturing
[nazev_orig] => Fatigue life of notches: an effect of manufacturing
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[popis] => In this study, the influence of notches in the area of gigacycle fatigue is investigated. The presented study offers experimental fatigue results of smooth and notched specimens. Specimens were made of AW 7075 - T6511 aluminum alloy and have “v” shape notch with radii of 0.1, 0.2, 0.4, 0.8, 1.5, and 3 mm. The fatigue experiments were performed using an ultrasonic fatigue testing machine at 20 kHz test frequency. Fatigue properties of the material were studied and evaluated up to 10 billion cycles in the area of very high cycle fatigue. All fatigue tests were carried out under uniaxial symmetric tension/compression loading (R = -1) at room temperature. As-machined surface and fracture surface of smooth specimens and specimens with 6 different notch radii were observed under an SEM microscope. Results show that there is a strong influence of the manufacturing process on fatigue lifetime.
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author="Bořek {Ščerba} and Tomáš {Adamec} and Tomáš {Návrat}",
title="Crack Length Calculator",
year="2022",
url="https://drive.google.com/file/d/1Qf1ZTm01KvNw9DNR8fPi4Zvo-ZGsf41S/view?usp=share_link",
note="Software"
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title="Palivové čerpadlo pro paliva používaná v raketových nosičích nové generace",
year="2022",
note="Utility model"
}
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[nazev_en] => Fuel pump for fuels used in new generation rocket launchers
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[citace_rtf] =>
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author="Tomáš {Návrat} and Jan {Pokorný} and Petr {Váňa} and Vladimír {Axman} and Lucie {Kadlecová} and Ondřej {Pavlík} and Michal {Vajdák}",
title="Systém zapojení miniaturizované řídící a silové elektroniky měniče",
year="2022",
note="Utility model"
}
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[poznamka_metriky] =>
[nazev_en] => Connection system of a miniaturized control and power electronics of the converter
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[nazev] => Mass sensing using micromechanical resonators operating in nonlinear regime
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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. Standardly the mass spectrometry is performed using the linearly operated resonators, which have however number of limitations. One of the main is a low accuracy of mass detection when particle is too heavy or light with respect to the resonator mass. An alternative way to this approach solving the mentioned drawback is presented here. The particle mass is characterized just from the change of the first resonant frequency and from the maximal vibrational amplitude in the resonators center upon crossing the resonant frequency. Attention is paid also to an analysis of the resonatoŕs mechanical reliability upon its operation.
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[klicova_slova] => Micromechanical resonator, nonlinear vibrations, mass spectrometry, FEM
[klicova_slova_orig] => Micromechanical resonator, nonlinear vibrations, mass spectrometry, FEM
[url] => https://ieeexplore.ieee.org/document/9983052
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[citace_text] => VENSKÝ, J.; ŠEVEČEK, O.; SKALKA, P.; KOTOUL, M.; STACHIV, I. Mass sensing using micromechanical resonators operating in nonlinear regime. In 2022 20th International Conference on Mechatronics - Mechatronika (ME). Pilsen, Czech Republic: IEEE, 2022. 4 p. ISBN: 978-1-6654-1040-3.
[citace_html] => VENSKÝ, J.; ŠEVEČEK, O.; SKALKA, P.; KOTOUL, M.; STACHIV, I. Mass sensing using micromechanical resonators operating in nonlinear regime. In 2022 20th International Conference on Mechatronics - Mechatronika (ME). Pilsen, Czech Republic: IEEE, 2022. 4 p. ISBN: 978-1-6654-1040-3.
[citace_rtf] =>
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author="Jiří {Venský} and Oldřich {Ševeček} and Petr {Skalka} and Michal {Kotoul} and Ivo {Stachiv}",
title="Mass sensing using micromechanical resonators operating in nonlinear regime",
booktitle="2022 20th International Conference on Mechatronics - Mechatronika (ME)",
year="2022",
pages="4",
publisher="IEEE",
address="Pilsen, Czech Republic",
doi="10.1109/ME54704.2022.9983052",
isbn="978-1-6654-1040-3",
url="https://ieeexplore.ieee.org/document/9983052"
}
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[popis_en] => 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. Standardly the mass spectrometry is performed using the linearly operated resonators, which have however number of limitations. One of the main is a low accuracy of mass detection when particle is too heavy or light with respect to the resonator mass. An alternative way to this approach solving the mentioned drawback is presented here. The particle mass is characterized just from the change of the first resonant frequency and from the maximal vibrational amplitude in the resonators center upon crossing the resonant frequency. Attention is paid also to an analysis of the resonatoŕs mechanical reliability upon its operation.
[klicova_slova_en] => Micromechanical resonator, nonlinear vibrations, mass spectrometry, FEM
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[nazev] => Application of the gradient theory to interface crack between two dissimilar dielectric materials
[nazev_orig] => Application of the gradient theory to interface crack between two dissimilar dielectric materials
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[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 mate-rials. 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 pro-tection 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 displacement gradients and strains 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 ma-terial 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 mate-rials. 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 pro-tection 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 displacement gradients and strains 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 ma-terial regions. The influence of these parameters on the crack opening displacement is discussed.
[klicova_slova] => Direct flexoelectricity; Gradient theory; A pure mechanical load; Induced electric potential
[klicova_slova_orig] => Direct flexoelectricity; Gradient theory; A pure mechanical load; Induced electric potential
[url] => https://www.sciencedirect.com/science/article/pii/S0013794422006130#!
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[citace_text] => SLÁDEK, J.; SLÁDEK, V.; HRYTSYNA, M.; PROFANT, T. Application of the gradient theory to interface crack between two dissimilar dielectric materials. ENGINEERING FRACTURE MECHANICS, 2022, vol. 276, no. B, p. 108895-108895. ISSN: 0013-7944.
[citace_html] => SLÁDEK, J.; SLÁDEK, V.; HRYTSYNA, M.; PROFANT, T. Application of the gradient theory to interface crack between two dissimilar dielectric materials. ENGINEERING FRACTURE MECHANICS, 2022, vol. 276, no. B, p. 108895-108895. ISSN: 0013-7944.
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author="Ján {Sládek} and Vladimír {Sládek} and Maryan {Hrytsyna} and Tomáš {Profant}",
title="Application of the gradient theory to interface crack between two dissimilar dielectric materials",
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volume="276",
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[nazev_en] => Application of the gradient theory to 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 mate-rials. 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 pro-tection 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 displacement gradients and strains 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 ma-terial regions. The influence of these parameters on the crack opening displacement is discussed.
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