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[nazev] => The Prediction of Fatigue Life of Notched Specimens
[nazev_orig] => The Prediction of Fatigue Life of Notched Specimens
[duvernost_udaju_id] => S
[popis] => The contribution presents a method for
lifetime predictions of components with notches.
The method was developed using experimental data
gained on smooth and notched samples and numerical
analysis of notched specimens. The method employs
approaches of generalized fracture mechanics and uses
a critical length parameter. Emphasis is placed on the
area of gigacycle fatigue.
[popis_orig] => The contribution presents a method for
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The method was developed using experimental data
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analysis of notched specimens. The method employs
approaches of generalized fracture mechanics and uses
a critical length parameter. Emphasis is placed on the
area of gigacycle fatigue.
[klicova_slova] => Wöhler curve; fatigue life; notches; generalized
fracture mechanics; stress distribution; gigacycle fatigue
[klicova_slova_orig] => Wöhler curve; fatigue life; notches; generalized
fracture mechanics; stress distribution; gigacycle fatigue
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author="Kamila {Kozáková} and Jan {Klusák}",
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gained on smooth and notched samples and numerical
analysis of notched specimens. The method employs
approaches of generalized fracture mechanics and uses
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fracture mechanics; stress distribution; gigacycle fatigue
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title="38th Danubia-Adria Symposium on Advances in Experimental Mechanics (DAS38)",
year="2022",
url="https://www.38danubia.org/",
note="Holding a conference"
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[nazev] => Wear Measurement of the Water-Lubricated Tilting-Pad Journal Bearing: Comparison of PEEK and CuBe materials
[nazev_orig] => Wear Measurement of the Water-Lubricated Tilting-Pad Journal Bearing: Comparison of PEEK and CuBe materials
[duvernost_udaju_id] => S
[popis] => Hydrodynamic tilting-pad journal bearings are
used in high-speed applications with vibration
resistance requirements. Tilting-pad bearings
consist of three or more pads which can be tilted.
Due to this feature, these bearings have much higher
stability in operation than other fixed geometry
hydrodynamic bearings. Increasingly, bearings
lubricated with lower viscosity fluids such as water
are becoming more popular, allowing them to be
used in clean applications without polluting the
environment with oil particles. Wear on the
bearing sliding surfaces is also an important factor
in these applications, not only in terms of bearing
life but also in terms of lubricant contamination.
Therefore, this paper is focused specifically on
bearing wear measurement.
[popis_orig] => Hydrodynamic tilting-pad journal bearings are
used in high-speed applications with vibration
resistance requirements. Tilting-pad bearings
consist of three or more pads which can be tilted.
Due to this feature, these bearings have much higher
stability in operation than other fixed geometry
hydrodynamic bearings. Increasingly, bearings
lubricated with lower viscosity fluids such as water
are becoming more popular, allowing them to be
used in clean applications without polluting the
environment with oil particles. Wear on the
bearing sliding surfaces is also an important factor
in these applications, not only in terms of bearing
life but also in terms of lubricant contamination.
Therefore, this paper is focused specifically on
bearing wear measurement.
[klicova_slova] => wear measurement; tilting-pad journal bearing; water-lubricated; CuBe; PEEK
[klicova_slova_orig] => wear measurement; tilting-pad journal bearing; water-lubricated; CuBe; PEEK
[url] =>
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[identifikator] => ISBN 978-618-86278-0-2
[identifikator_popis] => ISBN - Proceedings of 38th Danubia-Adria Symposium on Advances in Experimental Mechanics
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[citace_text] => POKORNÝ, J.; NÁVRAT, T.; VAJDÁK, M. Wear Measurement of the Water-Lubricated Tilting-Pad Journal Bearing: Comparison of PEEK and CuBe materials. In Proceedings of 38th Danubia-Adria Symposium on Advances in Experimental Mechanics. Poros: Greek Society of Experimental Mechanics of Materials, 2022. 2 p. ISBN: 978-618-86278-0-2.
[citace_html] => POKORNÝ, J.; NÁVRAT, T.; VAJDÁK, M. Wear Measurement of the Water-Lubricated Tilting-Pad Journal Bearing: Comparison of PEEK and CuBe materials. In Proceedings of 38th Danubia-Adria Symposium on Advances in Experimental Mechanics. Poros: Greek Society of Experimental Mechanics of Materials, 2022. 2 p. ISBN: 978-618-86278-0-2.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT179447,
author="Jan {Pokorný} and Tomáš {Návrat} and Michal {Vajdák}",
title="Wear Measurement of the Water-Lubricated Tilting-Pad Journal Bearing: Comparison of PEEK and CuBe materials",
booktitle="Proceedings of 38th Danubia-Adria Symposium on Advances in Experimental Mechanics",
year="2022",
pages="2",
publisher="Greek Society of Experimental Mechanics of Materials",
address="Poros",
isbn="978-618-86278-0-2"
}
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[nazev_en] => Wear Measurement of the Water-Lubricated Tilting-Pad Journal Bearing: Comparison of PEEK and CuBe materials
[popis_en] => Hydrodynamic tilting-pad journal bearings are
used in high-speed applications with vibration
resistance requirements. Tilting-pad bearings
consist of three or more pads which can be tilted.
Due to this feature, these bearings have much higher
stability in operation than other fixed geometry
hydrodynamic bearings. Increasingly, bearings
lubricated with lower viscosity fluids such as water
are becoming more popular, allowing them to be
used in clean applications without polluting the
environment with oil particles. Wear on the
bearing sliding surfaces is also an important factor
in these applications, not only in terms of bearing
life but also in terms of lubricant contamination.
Therefore, this paper is focused specifically on
bearing wear measurement.
[klicova_slova_en] => wear measurement; tilting-pad journal bearing; water-lubricated; CuBe; PEEK
[vysledek_datum] => 2022-09-20T00:00:00+02:00
)
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[nazev] => VALIDATION OF CRACK LENGTH MEASUREMENT METHOD WITH DIGITAL IMAGE CORRELATION FOR FATIGUE TESTS
[nazev_orig] => VALIDATION OF CRACK LENGTH MEASUREMENT METHOD WITH DIGITAL IMAGE CORRELATION FOR FATIGUE TESTS
[duvernost_udaju_id] => S
[popis] => Digital image correlation (DIC) as a nondestructive contactless technique for real-time surface deformations measurement have become a powerful tool in various applications. It still has great potential in areas such as fracture mechanics (FM), where crack length is important to evaluate fatigue properties of the material, often measured by travelling microscope. The test is frequently stopped and the microscope is manually used,
which takes a long time and the result is strongly dependent on the technician. Automated DIC measurement could help to solve these issues.
Therefore, this paper is focused on validation of the method, which would enable such automation and could be more robust and accurate than currently used DIC methods for crack length measurement.
[popis_orig] => Digital image correlation (DIC) as a nondestructive contactless technique for real-time surface deformations measurement have become a powerful tool in various applications. It still has great potential in areas such as fracture mechanics (FM), where crack length is important to evaluate fatigue properties of the material, often measured by travelling microscope. The test is frequently stopped and the microscope is manually used,
which takes a long time and the result is strongly dependent on the technician. Automated DIC measurement could help to solve these issues.
Therefore, this paper is focused on validation of the method, which would enable such automation and could be more robust and accurate than currently used DIC methods for crack length measurement.
[klicova_slova] => Digital image correlation; DIC; Crack length measurement; Crack opening displacement; COD; Inflection point
[klicova_slova_orig] => Digital image correlation; DIC; Crack length measurement; Crack opening displacement; COD; Inflection point
[url] =>
[oecd_obor_id] => 20302
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[schvalil_id] => 254501
[schvaleno] => 2023-03-01
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[vycet_osob] => ŠČERBA, B.; ADAMEC, T.; NÁVRAT, T.
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[identifikator] => ISBN 978-618-86278-0-2
[identifikator_popis] => ISBN - Proceedings of 38th Danubia-Adria Symposium on Advances in Experimental Mechanics
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[citace_text] => ŠČERBA, B.; ADAMEC, T.; NÁVRAT, T. VALIDATION OF CRACK LENGTH MEASUREMENT METHOD WITH DIGITAL IMAGE CORRELATION FOR FATIGUE TESTS. In Proceedings of 38th Danubia-Adria Symposium on Advances in Experimental Mechanics. Poros: Greek Society of Experimental Mechanics of Materials, 2022. 2 p. ISBN: 978-618-86278-0-2.
[citace_html] => ŠČERBA, B.; ADAMEC, T.; NÁVRAT, T. VALIDATION OF CRACK LENGTH MEASUREMENT METHOD WITH DIGITAL IMAGE CORRELATION FOR FATIGUE TESTS. In Proceedings of 38th Danubia-Adria Symposium on Advances in Experimental Mechanics. Poros: Greek Society of Experimental Mechanics of Materials, 2022. 2 p. ISBN: 978-618-86278-0-2.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT179466,
author="Bořek {Ščerba} and Tomáš {Adamec} and Tomáš {Návrat}",
title="VALIDATION OF CRACK LENGTH MEASUREMENT METHOD WITH DIGITAL IMAGE CORRELATION FOR FATIGUE TESTS",
booktitle="Proceedings of 38th Danubia-Adria Symposium on Advances in Experimental Mechanics",
year="2022",
pages="2",
publisher="Greek Society of Experimental Mechanics of Materials",
address="Poros",
isbn="978-618-86278-0-2"
}
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[nazev_en] => VALIDATION OF CRACK LENGTH MEASUREMENT METHOD WITH DIGITAL IMAGE CORRELATION FOR FATIGUE TESTS
[popis_en] => Digital image correlation (DIC) as a nondestructive contactless technique for real-time surface deformations measurement have become a powerful tool in various applications. It still has great potential in areas such as fracture mechanics (FM), where crack length is important to evaluate fatigue properties of the material, often measured by travelling microscope. The test is frequently stopped and the microscope is manually used,
which takes a long time and the result is strongly dependent on the technician. Automated DIC measurement could help to solve these issues.
Therefore, this paper is focused on validation of the method, which would enable such automation and could be more robust and accurate than currently used DIC methods for crack length measurement.
[klicova_slova_en] => Digital image correlation; DIC; Crack length measurement; Crack opening displacement; COD; Inflection point
[vysledek_datum] => 2022-09-20T00:00:00+02:00
)
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[nazev] => Achievable accuracy of resonating nanomechanical systems for mass sensing of larger analytes in GDa range
[nazev_orig] => Achievable accuracy of resonating nanomechanical systems for mass sensing of larger analytes in GDa range
[duvernost_udaju_id] => S
[popis] => Measurement of larger analytes such as many chemical and biological structures or viruses in gigadalton (GDa) range is a reminding fundamental task in analytical chemistry and life sciences, which can be possibly resolved with the resonating nanomechanical systems. Common approaches to mass sensing with these systems model the bound analyte as a point particle and assume the analyte does not change the vibrational mode shapes. However, for larger analytes their stiffness and size not only affect the resonant frequencies but also cause the significant changes in the vibrational mode shapes making their measurement highly challenging and still under-explored problem. Here, we develop a 3D model capable to accurately predict the resonant frequencies and vibrational mode shapes of the resonating nanomechanical systems with the bound analyte of arbitrary properties and size. Then, we examine in details the impact of analyte properties, size and its position of attachment on the resonant frequencies and vibrational mode shapes and, correspondingly, resolve a dispute over the achievable detection limits of the nanomechanical systems, especially for mass sensing of larger analytes. Furthermore, we identify three different sensing regimes, that is, the ultra-light, light and heavy, for which the effects of the analyte mass, stiffness, its size and the position of attachment on the accuracy of the determined mass can be separated. For the ultra-light regime (mass ratio < 10-3) the analyte stiffness and its size affect notably the resonant frequencies, the point mass approximation is inaccurate and the analyte can be identified by its mass and stiffness. For the light regime the point mass approximation is accurate, while for the heavy one (mass ratio > 2 center dot 10- 2) the mass effect dominates the frequency response and alters the vibrational mode shapes which, for the common approaches, yields the errors in the determined analyte mass. Finally, we also propose an easily accessible approach for the identification of larger analytes (in GDa range) that does not require the advanced computational tools or experimental setup, applicable to the majority of the clamped-clamped ends resonating nanomechanical systems.
[popis_orig] => Measurement of larger analytes such as many chemical and biological structures or viruses in gigadalton (GDa) range is a reminding fundamental task in analytical chemistry and life sciences, which can be possibly resolved with the resonating nanomechanical systems. Common approaches to mass sensing with these systems model the bound analyte as a point particle and assume the analyte does not change the vibrational mode shapes. However, for larger analytes their stiffness and size not only affect the resonant frequencies but also cause the significant changes in the vibrational mode shapes making their measurement highly challenging and still under-explored problem. Here, we develop a 3D model capable to accurately predict the resonant frequencies and vibrational mode shapes of the resonating nanomechanical systems with the bound analyte of arbitrary properties and size. Then, we examine in details the impact of analyte properties, size and its position of attachment on the resonant frequencies and vibrational mode shapes and, correspondingly, resolve a dispute over the achievable detection limits of the nanomechanical systems, especially for mass sensing of larger analytes. Furthermore, we identify three different sensing regimes, that is, the ultra-light, light and heavy, for which the effects of the analyte mass, stiffness, its size and the position of attachment on the accuracy of the determined mass can be separated. For the ultra-light regime (mass ratio < 10-3) the analyte stiffness and its size affect notably the resonant frequencies, the point mass approximation is inaccurate and the analyte can be identified by its mass and stiffness. For the light regime the point mass approximation is accurate, while for the heavy one (mass ratio > 2 center dot 10- 2) the mass effect dominates the frequency response and alters the vibrational mode shapes which, for the common approaches, yields the errors in the determined analyte mass. Finally, we also propose an easily accessible approach for the identification of larger analytes (in GDa range) that does not require the advanced computational tools or experimental setup, applicable to the majority of the clamped-clamped ends resonating nanomechanical systems.
[klicova_slova] => Nanomechanical resonator; Mass sensing; Heavy mass spectrometry; FEM; Resonant frequency
[klicova_slova_orig] => Nanomechanical resonator; Mass sensing; Heavy mass spectrometry; FEM; Resonant frequency
[url] => https://www.sciencedirect.com/science/article/pii/S0020740322002636?pes=vor
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[vycet_osob] => STACHIV, I.; MACHŮ, Z.; ŠEVEČEK, O.; JENG, Y.; LI, W.; KOTOUL, M.; PRÁŠEK, J.
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[citace_text] => STACHIV, I.; MACHŮ, Z.; ŠEVEČEK, O.; JENG, Y.; LI, W.; KOTOUL, M.; PRÁŠEK, J. Achievable accuracy of resonating nanomechanical systems for mass sensing of larger analytes in GDa range. International Journal of Mechanical Sciences, 2022, vol. 224, no. červen, p. 1-15. ISSN: 0020-7403.
[citace_html] => STACHIV, I.; MACHŮ, Z.; ŠEVEČEK, O.; JENG, Y.; LI, W.; KOTOUL, M.; PRÁŠEK, J. Achievable accuracy of resonating nanomechanical systems for mass sensing of larger analytes in GDa range. International Journal of Mechanical Sciences, 2022, vol. 224, no. červen, p. 1-15. ISSN: 0020-7403.
[citace_rtf] =>
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author="STACHIV, I. and MACHŮ, Z. and ŠEVEČEK, O. and JENG, Y. and LI, W. and KOTOUL, M. and PRÁŠEK, J.",
title="Achievable accuracy of resonating nanomechanical systems for mass sensing of larger analytes in GDa range",
journal="International Journal of Mechanical Sciences",
year="2022",
volume="224",
number="červen",
pages="1--15",
doi="10.1016/j.ijmecsci.2022.107353",
issn="0020-7403",
url="https://www.sciencedirect.com/science/article/pii/S0020740322002636?pes=vor"
}
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[nazev_en] => Achievable accuracy of resonating nanomechanical systems for mass sensing of larger analytes in GDa range
[popis_en] => Measurement of larger analytes such as many chemical and biological structures or viruses in gigadalton (GDa) range is a reminding fundamental task in analytical chemistry and life sciences, which can be possibly resolved with the resonating nanomechanical systems. Common approaches to mass sensing with these systems model the bound analyte as a point particle and assume the analyte does not change the vibrational mode shapes. However, for larger analytes their stiffness and size not only affect the resonant frequencies but also cause the significant changes in the vibrational mode shapes making their measurement highly challenging and still under-explored problem. Here, we develop a 3D model capable to accurately predict the resonant frequencies and vibrational mode shapes of the resonating nanomechanical systems with the bound analyte of arbitrary properties and size. Then, we examine in details the impact of analyte properties, size and its position of attachment on the resonant frequencies and vibrational mode shapes and, correspondingly, resolve a dispute over the achievable detection limits of the nanomechanical systems, especially for mass sensing of larger analytes. Furthermore, we identify three different sensing regimes, that is, the ultra-light, light and heavy, for which the effects of the analyte mass, stiffness, its size and the position of attachment on the accuracy of the determined mass can be separated. For the ultra-light regime (mass ratio < 10-3) the analyte stiffness and its size affect notably the resonant frequencies, the point mass approximation is inaccurate and the analyte can be identified by its mass and stiffness. For the light regime the point mass approximation is accurate, while for the heavy one (mass ratio > 2 center dot 10- 2) the mass effect dominates the frequency response and alters the vibrational mode shapes which, for the common approaches, yields the errors in the determined analyte mass. Finally, we also propose an easily accessible approach for the identification of larger analytes (in GDa range) that does not require the advanced computational tools or experimental setup, applicable to the majority of the clamped-clamped ends resonating nanomechanical systems.
[klicova_slova_en] => Nanomechanical resonator; Mass sensing; Heavy mass spectrometry; FEM; Resonant frequency
[vysledek_datum] => 2022-06-15T00:00:00+02:00
)
[6] => Array
(
[vysledek_id] => 179710
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[nazev] => THEORETICAL STUDY OF NONLINEAR CHATTER STABILITY ANALYSIS BASED ON SYNTHESIS OF LINEARIZATIONS IN OPERATING POINTS FOR DIFFERENT TURNING CONDITIONS
[nazev_orig] => THEORETICAL STUDY OF NONLINEAR CHATTER STABILITY ANALYSIS BASED ON SYNTHESIS OF LINEARIZATIONS IN OPERATING POINTS FOR DIFFERENT TURNING CONDITIONS
[duvernost_udaju_id] => S
[popis] => This paper deals with an approach to study nonlinear chatter analysis, which is based on the synthesis of linear theory for different turning conditions. Mainly, contact nonlinearities play a crucial role in the behavior of the machine tool and the stability of turning operation. However, the analysis of nonlinear systems is challenging because nonlinear system analyzes are often limited to a linearized solution, which may be insufficient to reveal the stability lobe diagram. The presented study proposes a theoretical approach which is based on a synthesis of linearization in the operating point. This approach provides several solutions of stability lobe diagrams which are strongly depending on the loading conditions of the nonlinear system and all solutions are integrated to the final stability lobe diagram. The presented method is applied to a simplified 2D structure between two supports with nonlinear contact stiffness. Resulted analysis of the lobe diagram are compared with results of the time-domine simulations and it shows a good match. This paper shows that the presented approach offers an effective solution for refining the stability estimate for nonlinear mechanical systems.
[popis_orig] => This paper deals with an approach to study nonlinear chatter analysis, which is based on the synthesis of linear theory for different turning conditions. Mainly, contact nonlinearities play a crucial role in the behavior of the machine tool and the stability of turning operation. However, the analysis of nonlinear systems is challenging because nonlinear system analyzes are often limited to a linearized solution, which may be insufficient to reveal the stability lobe diagram. The presented study proposes a theoretical approach which is based on a synthesis of linearization in the operating point. This approach provides several solutions of stability lobe diagrams which are strongly depending on the loading conditions of the nonlinear system and all solutions are integrated to the final stability lobe diagram. The presented method is applied to a simplified 2D structure between two supports with nonlinear contact stiffness. Resulted analysis of the lobe diagram are compared with results of the time-domine simulations and it shows a good match. This paper shows that the presented approach offers an effective solution for refining the stability estimate for nonlinear mechanical systems.
[klicova_slova] => Chatter; nonlinear system; contact; linearization; machine tool; stability lobe diagram
[klicova_slova_orig] => Chatter; nonlinear system; contact; linearization; machine tool; stability lobe diagram
[url] => https://www.mmscience.eu/2021083
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[citace_text] => HADRABA, P.; WANG, J.; LIN, H.; HADAŠ, Z. THEORETICAL STUDY OF NONLINEAR CHATTER STABILITY ANALYSIS BASED ON SYNTHESIS OF LINEARIZATIONS IN OPERATING POINTS FOR DIFFERENT TURNING CONDITIONS. MM Science Journal, 2022, vol. 2022, no. October, p. 5846-5853. ISSN: 1803-1269.
[citace_html] => HADRABA, P.; WANG, J.; LIN, H.; HADAŠ, Z. THEORETICAL STUDY OF NONLINEAR CHATTER STABILITY ANALYSIS BASED ON SYNTHESIS OF LINEARIZATIONS IN OPERATING POINTS FOR DIFFERENT TURNING CONDITIONS. MM Science Journal, 2022, vol. 2022, no. October, p. 5846-5853. ISSN: 1803-1269.
[citace_rtf] =>
[citace_bibtex] => @article{BUT179710,
author="Petr {Hadraba} and JIUNN-JYH {WANG} and Huei-Min {Lin} and Zdeněk {Hadaš}",
title="THEORETICAL STUDY OF NONLINEAR CHATTER STABILITY ANALYSIS BASED ON SYNTHESIS OF LINEARIZATIONS IN OPERATING POINTS FOR DIFFERENT TURNING CONDITIONS",
journal="MM Science Journal",
year="2022",
volume="2022",
number="October",
pages="5846--5853",
doi="10.17973/MMSJ.2022\{_}10\{_}2021083",
issn="1803-1269",
url="https://www.mmscience.eu/2021083"
}
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[nazev_en] => THEORETICAL STUDY OF NONLINEAR CHATTER STABILITY ANALYSIS BASED ON SYNTHESIS OF LINEARIZATIONS IN OPERATING POINTS FOR DIFFERENT TURNING CONDITIONS
[popis_en] => This paper deals with an approach to study nonlinear chatter analysis, which is based on the synthesis of linear theory for different turning conditions. Mainly, contact nonlinearities play a crucial role in the behavior of the machine tool and the stability of turning operation. However, the analysis of nonlinear systems is challenging because nonlinear system analyzes are often limited to a linearized solution, which may be insufficient to reveal the stability lobe diagram. The presented study proposes a theoretical approach which is based on a synthesis of linearization in the operating point. This approach provides several solutions of stability lobe diagrams which are strongly depending on the loading conditions of the nonlinear system and all solutions are integrated to the final stability lobe diagram. The presented method is applied to a simplified 2D structure between two supports with nonlinear contact stiffness. Resulted analysis of the lobe diagram are compared with results of the time-domine simulations and it shows a good match. This paper shows that the presented approach offers an effective solution for refining the stability estimate for nonlinear mechanical systems.
[klicova_slova_en] => Chatter; nonlinear system; contact; linearization; machine tool; stability lobe diagram
[vysledek_datum] => 2022-10-27T00:00:00+02:00
)
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(
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[nazev] => Investigation of Microstructure and Mechanical Properties of
SLM-Fabricated AlSi10Mg Alloy Post-Processed Using Equal
Channel Angular Pressing (ECAP)
[nazev_orig] => Investigation of Microstructure and Mechanical Properties of
SLM-Fabricated AlSi10Mg Alloy Post-Processed Using Equal
Channel Angular Pressing (ECAP)
[duvernost_udaju_id] => S
[popis] => With the aim of improving the excellent mechanical properties of the SLM-produced
AlSi10Mg alloy, this research focuses on post-processing using ECAP (Equal Channel Angular Pressing).
In our article, two different post-processing strategies were investigated: (1) low-temperature
annealing (LTA) and subsequent ECAP processing at 150 C; (2) no heat treatment and subsequent
ECAP processing at 350 C, 400 C and 450 C. The microstructure and mechanical properties of this
alloy were analyzed at each stage of post-treatment. Metallographic observations, combined with
SEM and EBSD studies, showed that the alloys produced by SLM have a unique cellular microstructure
consisting of Si networks surrounding the Al-based matrix phase. Low-temperature annealing
(LTA), followed by ECAP treatment, facilitated the microstructural evolution of the alloy with partial
breakup of the Si network and observed nucleation of -Si precipitates throughout the Al matrix.
This resulted in a Vickers microhardness of 153 HV and a yield strength of 415 MPa. The main results
show that post-processing of SLM-produced AlSi10Mg alloys using ECAP significantly affects the
microstructural evolution and mechanical properties of the alloy.
[popis_orig] => With the aim of improving the excellent mechanical properties of the SLM-produced
AlSi10Mg alloy, this research focuses on post-processing using ECAP (Equal Channel Angular Pressing).
In our article, two different post-processing strategies were investigated: (1) low-temperature
annealing (LTA) and subsequent ECAP processing at 150 C; (2) no heat treatment and subsequent
ECAP processing at 350 C, 400 C and 450 C. The microstructure and mechanical properties of this
alloy were analyzed at each stage of post-treatment. Metallographic observations, combined with
SEM and EBSD studies, showed that the alloys produced by SLM have a unique cellular microstructure
consisting of Si networks surrounding the Al-based matrix phase. Low-temperature annealing
(LTA), followed by ECAP treatment, facilitated the microstructural evolution of the alloy with partial
breakup of the Si network and observed nucleation of -Si precipitates throughout the Al matrix.
This resulted in a Vickers microhardness of 153 HV and a yield strength of 415 MPa. The main results
show that post-processing of SLM-produced AlSi10Mg alloys using ECAP significantly affects the
microstructural evolution and mechanical properties of the alloy.
[klicova_slova] => AlSi10Mg alloy; equal channel angular pressing (ECAP); microstructure; microhardness;
yield strength; scanning electron microscopy; electron backscatter diffraction (EBSD)
[klicova_slova_orig] => AlSi10Mg alloy; equal channel angular pressing (ECAP); microstructure; microhardness;
yield strength; scanning electron microscopy; electron backscatter diffraction (EBSD)
[url] => https://www.mdpi.com/1996-1944/15/22/7940
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[citace_text] => SNOPIŇSKI, P., APPIAH, A.N.S., HILŠER, O.,KOTOUL, M. Investigation of Microstructure and Mechanical Properties of SLM-Fabricated AlSi10Mg Alloy Post-Processed Using Equal Channel Angular Pressing (ECAP). Materials, 2022, vol. 15, no. 22, p. 7940-7940. ISSN: 1996-1944.
[citace_html] => SNOPIŇSKI, P., APPIAH, A.N.S., HILŠER, O.,KOTOUL, M. Investigation of Microstructure and Mechanical Properties of SLM-Fabricated AlSi10Mg Alloy Post-Processed Using Equal Channel Angular Pressing (ECAP). Materials, 2022, vol. 15, no. 22, p. 7940-7940. ISSN: 1996-1944.
[citace_rtf] =>
[citace_bibtex] => @article{BUT179960,
author="Michal {Kotoul}",
title="Investigation of Microstructure and Mechanical Properties of
SLM-Fabricated AlSi10Mg Alloy Post-Processed Using Equal
Channel Angular Pressing (ECAP)",
journal="Materials",
year="2022",
volume="15",
number="22",
pages="7940--7940",
doi="10.3390/ma15227940",
url="https://www.mdpi.com/1996-1944/15/22/7940"
}
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[poznamka_metriky] =>
[nazev_en] => Investigation of Microstructure and Mechanical Properties of
SLM-Fabricated AlSi10Mg Alloy Post-Processed Using Equal
Channel Angular Pressing (ECAP)
[popis_en] => With the aim of improving the excellent mechanical properties of the SLM-produced
AlSi10Mg alloy, this research focuses on post-processing using ECAP (Equal Channel Angular Pressing).
In our article, two different post-processing strategies were investigated: (1) low-temperature
annealing (LTA) and subsequent ECAP processing at 150 C; (2) no heat treatment and subsequent
ECAP processing at 350 C, 400 C and 450 C. The microstructure and mechanical properties of this
alloy were analyzed at each stage of post-treatment. Metallographic observations, combined with
SEM and EBSD studies, showed that the alloys produced by SLM have a unique cellular microstructure
consisting of Si networks surrounding the Al-based matrix phase. Low-temperature annealing
(LTA), followed by ECAP treatment, facilitated the microstructural evolution of the alloy with partial
breakup of the Si network and observed nucleation of -Si precipitates throughout the Al matrix.
This resulted in a Vickers microhardness of 153 HV and a yield strength of 415 MPa. The main results
show that post-processing of SLM-produced AlSi10Mg alloys using ECAP significantly affects the
microstructural evolution and mechanical properties of the alloy.
[klicova_slova_en] => AlSi10Mg alloy; equal channel angular pressing (ECAP); microstructure; microhardness;
yield strength; scanning electron microscopy; electron backscatter diffraction (EBSD)
[vysledek_datum] => 2022-11-10T00:00:00+01:00
)
[8] => Array
(
[vysledek_id] => 179966
[vysledek_druh_id] => CONPAX
[ex_vysledek_id] => 146217
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[nazev] => Additive manufacturing capabilities for heat switch technology: Key challenges & knowledge gaps
[nazev_orig] => Additive manufacturing capabilities for heat switch technology: Key challenges & knowledge gaps
[duvernost_udaju_id] => S
[popis] => The paper is to provide an overview of the key challenges and knowledge gaps in additive manufacturing of metals applied to two parts of a novel heat switch technology – a Baseplate and a Flexible thermal structure. Additive design, optimization and manufacturing capabilities as well as quality of produced parts were investigated. The key challenge was to manufacture bio-inspired structure without internal supports and assure 190 surfaces to be in a contact at the same time for efficient heat transfer. Finally, modern trends in additive as multi-material design and manufacturing or effect of defects are discussed for further evolution of parts.
[popis_orig] => The paper is to provide an overview of the key challenges and knowledge gaps in additive manufacturing of metals applied to two parts of a novel heat switch technology – a Baseplate and a Flexible thermal structure. Additive design, optimization and manufacturing capabilities as well as quality of produced parts were investigated. The key challenge was to manufacture bio-inspired structure without internal supports and assure 190 surfaces to be in a contact at the same time for efficient heat transfer. Finally, modern trends in additive as multi-material design and manufacturing or effect of defects are discussed for further evolution of parts.
[klicova_slova] => Space technology, heat switch, additive manufacturing of metals, capabilities
[klicova_slova_orig] => Space technology, heat switch, additive manufacturing of metals, capabilities
[url] => https://www.eucass.eu/conferences-and-publications/search-on-this-website?searchword=eucass2022%20Masek&searchphrase=all&limit=20&areas[0]=doc_indexer
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[vycet_osob] => MAŠEK, J.; LÖFFELMANN, F.; POPELA, R.; KUBÍK, P.; ŠEBEK, F.; KOUTNÝ, D.; MALÝ, M.; PANTĚLEJEV, L.; PAMBAGUIAN, L.
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[citace_text] => MAŠEK, J.; LÖFFELMANN, F.; POPELA, R.; KUBÍK, P.; ŠEBEK, F.; KOUTNÝ, D.; MALÝ, M.; PANTĚLEJEV, L.; PAMBAGUIAN, L. Additive manufacturing capabilities for heat switch technology: Key challenges & knowledge gaps. Lille, Francie: EUCASS association, 2022. p. 1-15.
[citace_html] => MAŠEK, J.; LÖFFELMANN, F.; POPELA, R.; KUBÍK, P.; ŠEBEK, F.; KOUTNÝ, D.; MALÝ, M.; PANTĚLEJEV, L.; PAMBAGUIAN, L. Additive manufacturing capabilities for heat switch technology: Key challenges & knowledge gaps. Lille, Francie: EUCASS association, 2022. p. 1-15.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT179966,
author="Jakub {Mašek} and František {Löffelmann} and Robert {Popela} and Petr {Kubík} and František {Šebek} and Daniel {Koutný} and Martin {Malý} and Libor {Pantělejev} and Laurent {Pambaguian}",
title="Additive manufacturing capabilities for heat switch technology: Key challenges & knowledge gaps",
year="2022",
pages="1--15",
publisher="EUCASS association",
address="Lille, Francie",
doi="10.13009/EUCASS2022-6196",
url="https://www.eucass.eu/conferences-and-publications/search-on-this-website?searchword=eucass2022%20Masek&searchphrase=all&limit=20&areas[0]=doc_indexer"
}
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[poznamka_metriky] =>
[nazev_en] => Additive manufacturing capabilities for heat switch technology: Key challenges & knowledge gaps
[popis_en] => The paper is to provide an overview of the key challenges and knowledge gaps in additive manufacturing of metals applied to two parts of a novel heat switch technology – a Baseplate and a Flexible thermal structure. Additive design, optimization and manufacturing capabilities as well as quality of produced parts were investigated. The key challenge was to manufacture bio-inspired structure without internal supports and assure 190 surfaces to be in a contact at the same time for efficient heat transfer. Finally, modern trends in additive as multi-material design and manufacturing or effect of defects are discussed for further evolution of parts.
[klicova_slova_en] => Space technology, heat switch, additive manufacturing of metals, capabilities
[vysledek_datum] => 2022-09-28T00:00:00+02:00
)
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(
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[nazev] => ROLLER PUMP CONTROLLED BY NEURAL NETWORK: EXPERIMENTAL STUDY UNDER PHYSIOLOGICAL CONDITIONS
[nazev_orig] => ROLLER PUMP CONTROLLED BY NEURAL NETWORK: EXPERIMENTAL STUDY UNDER PHYSIOLOGICAL CONDITIONS
[duvernost_udaju_id] => S
[popis] => The paper aims at exploitation of neural networks to create a required pulse wave in a compliant hydraulic circuit, representing arterial architecture. The pulse wave is evoked with a roller pump with its rotation speed controlled by a step motor. Peripheral resistance is created by a system of compliant silicon tubes mimicking arterial tree. The measured pressure waves in two positions and their derivatives will be exploited as datasets to train the neural network and, in the end, to reach a more physiological shape of the pulse wave than can be reached by a manual setting.
[popis_orig] => The paper aims at exploitation of neural networks to create a required pulse wave in a compliant hydraulic circuit, representing arterial architecture. The pulse wave is evoked with a roller pump with its rotation speed controlled by a step motor. Peripheral resistance is created by a system of compliant silicon tubes mimicking arterial tree. The measured pressure waves in two positions and their derivatives will be exploited as datasets to train the neural network and, in the end, to reach a more physiological shape of the pulse wave than can be reached by a manual setting.
[klicova_slova] => Physiological waveform; Neural network; Roller pump
[klicova_slova_orig] => Physiological waveform; Neural network; Roller pump
[url] => https://www.compbiomed.net/getfile.php?type=16/site_documents&id=CMBE%202022%20Proceedings%20volume1.pdf
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[identifikator] => ISBN 978-0-9562914-6-2 ISSN 2227-9385
[identifikator_popis] => ISBN - CMBE22 7th International Conference on Computational & Mathematical Biomedical Engineering ISSN - 7th International Conference on Computational and Mathematical Biomedical Engineering – CMBE2021 (IT)
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[citace_text] => JAGOŠ, J.; KOHÚT, J.; KOHÚT, J.; FORMÁNEK, M.; BURŠA, J. ROLLER PUMP CONTROLLED BY NEURAL NETWORK: EXPERIMENTAL STUDY UNDER PHYSIOLOGICAL CONDITIONS. CMBE22 7th International Conference on Computational & Mathematical Biomedical Engineering. 7th International Conference on Computational and Mathematical Biomedical Engineering – CMBE2021. Cardiff, United Kingdom: Computational and scientific consultancy services Ltd, 2022. p. 389-392. ISBN: 978-0-9562914-6-2. ISSN: 2227-9385.
[citace_html] => JAGOŠ, J.; KOHÚT, J.; KOHÚT, J.; FORMÁNEK, M.; BURŠA, J. ROLLER PUMP CONTROLLED BY NEURAL NETWORK: EXPERIMENTAL STUDY UNDER PHYSIOLOGICAL CONDITIONS. CMBE22 7th International Conference on Computational & Mathematical Biomedical Engineering. 7th International Conference on Computational and Mathematical Biomedical Engineering – CMBE2021. Cardiff, United Kingdom: Computational and scientific consultancy services Ltd, 2022. p. 389-392. ISBN: 978-0-9562914-6-2. ISSN: 2227-9385.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT180254,
author="Jiří {Jagoš} and Jiří {Kohút} and Jan {Kohút} and Martin {Formánek} and Jiří {Burša}",
title="ROLLER PUMP CONTROLLED BY NEURAL NETWORK: EXPERIMENTAL STUDY UNDER PHYSIOLOGICAL CONDITIONS",
booktitle="CMBE22 7th International Conference on Computational & Mathematical Biomedical Engineering",
year="2022",
journal="7th International Conference on Computational and Mathematical Biomedical Engineering – CMBE2021",
pages="389--392",
publisher="Computational and scientific consultancy services Ltd",
address="Cardiff, United Kingdom",
isbn="978-0-9562914-6-2",
issn="2227-9385",
url="https://www.compbiomed.net/getfile.php?type=16/site_documents&id=CMBE%202022%20Proceedings%20volume1.pdf"
}
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[nazev_en] => ROLLER PUMP CONTROLLED BY NEURAL NETWORK: EXPERIMENTAL STUDY UNDER PHYSIOLOGICAL CONDITIONS
[popis_en] => The paper aims at exploitation of neural networks to create a required pulse wave in a compliant hydraulic circuit, representing arterial architecture. The pulse wave is evoked with a roller pump with its rotation speed controlled by a step motor. Peripheral resistance is created by a system of compliant silicon tubes mimicking arterial tree. The measured pressure waves in two positions and their derivatives will be exploited as datasets to train the neural network and, in the end, to reach a more physiological shape of the pulse wave than can be reached by a manual setting.
[klicova_slova_en] => Physiological waveform; Neural network; Roller pump
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(
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[nazev] => In vitro structured tree model of the peripheral vascular network
[nazev_orig] => In vitro structured tree model of the peripheral vascular network
[duvernost_udaju_id] => S
[popis] => The peripheral arterial system consists of small arteries and arterioles, further branching into capillaries. This complex system could be faithfully represented by an asymmetrically structured tree. Such an approach has been used solely in computational analyses, for instance, 1D fluid-structure interaction simulations or multiscale modelling (3D/1D). In vitro flow phantom studies incorporate only pure resistance or two-element Windkessel to mimic the periphery. Thus, the flow and pressure waveforms in these in vitro studies do not qualitatively correspond to those measured in vivo and consequently nor do the input impedance of the periphery, which is rarely shown. To consider the frequency-dependent input impedance of the tree close to that observed in vivo, we created an experimental circuit. It comprises a peristaltic pump as a source of a physiological waveform, an asymmetric structured tree model constructed from commonly available silicon tubes, and a measurement technique for obtaining the input impedance. A good agreement between mathematical and experimental data was found despite some inaccuracies and imperfections in the assembled tree. Therefore, the mathematical model can serve as a design tool for individual in vitro structured tree models representing different peripheral sites. Consequently, the in vitro model could be included in phantom studies as a more realistic boundary condition.
[popis_orig] => The peripheral arterial system consists of small arteries and arterioles, further branching into capillaries. This complex system could be faithfully represented by an asymmetrically structured tree. Such an approach has been used solely in computational analyses, for instance, 1D fluid-structure interaction simulations or multiscale modelling (3D/1D). In vitro flow phantom studies incorporate only pure resistance or two-element Windkessel to mimic the periphery. Thus, the flow and pressure waveforms in these in vitro studies do not qualitatively correspond to those measured in vivo and consequently nor do the input impedance of the periphery, which is rarely shown. To consider the frequency-dependent input impedance of the tree close to that observed in vivo, we created an experimental circuit. It comprises a peristaltic pump as a source of a physiological waveform, an asymmetric structured tree model constructed from commonly available silicon tubes, and a measurement technique for obtaining the input impedance. A good agreement between mathematical and experimental data was found despite some inaccuracies and imperfections in the assembled tree. Therefore, the mathematical model can serve as a design tool for individual in vitro structured tree models representing different peripheral sites. Consequently, the in vitro model could be included in phantom studies as a more realistic boundary condition.
[klicova_slova] => mathematical model; experimental circuit; structured tree model; peripheral vascular network
[klicova_slova_orig] => mathematical model; experimental circuit; structured tree model; peripheral vascular network
[url] => https://dspace5.zcu.cz/bitstream/11025/46012/2/CM2021_Conference_Proceedings-128-131.pdf
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[citace_html] => KOHÚT, J.; JAGOŠ, J.; FORMÁNEK, M.; BURŠA, J. In vitro structured tree model of the peripheral vascular network. PROCEEDINGS OF COMPUTATIONAL MECHANICS 2021. Plzeň: University of West Bohemia, 2021. p. 118-121. ISBN: 978-80-261-1059-0.
[citace_rtf] =>
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author="Jiří {Kohút} and Jiří {Jagoš} and Martin {Formánek} and Jiří {Burša}",
title="In vitro structured tree model of the peripheral vascular network",
booktitle="PROCEEDINGS OF COMPUTATIONAL MECHANICS 2021",
year="2021",
pages="118--121",
publisher="University of West Bohemia",
address="Plzeň",
isbn="978-80-261-1059-0",
url="https://dspace5.zcu.cz/bitstream/11025/46012/2/CM2021_Conference_Proceedings-128-131.pdf"
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[nazev_en] => In vitro structured tree model of the peripheral vascular network
[popis_en] => The peripheral arterial system consists of small arteries and arterioles, further branching into capillaries. This complex system could be faithfully represented by an asymmetrically structured tree. Such an approach has been used solely in computational analyses, for instance, 1D fluid-structure interaction simulations or multiscale modelling (3D/1D). In vitro flow phantom studies incorporate only pure resistance or two-element Windkessel to mimic the periphery. Thus, the flow and pressure waveforms in these in vitro studies do not qualitatively correspond to those measured in vivo and consequently nor do the input impedance of the periphery, which is rarely shown. To consider the frequency-dependent input impedance of the tree close to that observed in vivo, we created an experimental circuit. It comprises a peristaltic pump as a source of a physiological waveform, an asymmetric structured tree model constructed from commonly available silicon tubes, and a measurement technique for obtaining the input impedance. A good agreement between mathematical and experimental data was found despite some inaccuracies and imperfections in the assembled tree. Therefore, the mathematical model can serve as a design tool for individual in vitro structured tree models representing different peripheral sites. Consequently, the in vitro model could be included in phantom studies as a more realistic boundary condition.
[klicova_slova_en] => mathematical model; experimental circuit; structured tree model; peripheral vascular network
[vysledek_datum] => 2021-11-08T00:00:00+01:00
)
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(
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[duvernost_udaju_id] => S
[popis] =>
[popis_orig] =>
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[citace_text] => 7th International Conference on Computational and Mathematical Biomedical Engineering. Milan (27.06.2022)
[citace_html] => 7th International Conference on Computational and Mathematical Biomedical Engineering. Milan (27.06.2022)
[citace_rtf] =>
[citace_bibtex] => @misc{BUT180336,
title="7th International Conference on Computational and Mathematical Biomedical Engineering",
year="2022",
url="https://www.compbiomed.net/",
note="Holding a conference"
}
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[nazev] => Influencing the Indentation Curves by the Tilt of the Berkovich Indenter at FEM Modelling of the Steel Nanoindentation
[nazev_orig] => Influencing the Indentation Curves by the Tilt of the Berkovich Indenter at FEM Modelling of the Steel Nanoindentation
[duvernost_udaju_id] => S
[popis] => The influence of the Berkovich indenter tilt on the results of the FEM modelling of steel nanoindentation is evaluated in this paper. The shape deviations of the indenter have a great impact on the results of the nanoindentation. The main deviations are the indenter bluntness and indenter tilt. The indenter tilt has an impact on the shape of the contact area and the shape of indentation curves. The X5CrNiCuNb 16-4 steel nanoindentation with Berkovich indenter was modelled and the indentation curves were obtained. The Berkovich indenter was blunted and the tilt of the indenter was changed to determine the influence of the indentation curves by the indenter tilt. The plasticity of the steel was modelled with the multilinear model of material, which was fitted to the data from tensile test. The results showed that growing tilt shifts the indentation curves to higher values of indentation forces and makes unloading curves slightly steeper which is in the agreement with larger contact area. The calculated indentation curves were compared with the indentation curves obtained by experiment and the impact of the indenter tilt to the indentation curves was determined by the comparing of the maximal forces and the shapes of the indentation curves.
[popis_orig] => The influence of the Berkovich indenter tilt on the results of the FEM modelling of steel nanoindentation is evaluated in this paper. The shape deviations of the indenter have a great impact on the results of the nanoindentation. The main deviations are the indenter bluntness and indenter tilt. The indenter tilt has an impact on the shape of the contact area and the shape of indentation curves. The X5CrNiCuNb 16-4 steel nanoindentation with Berkovich indenter was modelled and the indentation curves were obtained. The Berkovich indenter was blunted and the tilt of the indenter was changed to determine the influence of the indentation curves by the indenter tilt. The plasticity of the steel was modelled with the multilinear model of material, which was fitted to the data from tensile test. The results showed that growing tilt shifts the indentation curves to higher values of indentation forces and makes unloading curves slightly steeper which is in the agreement with larger contact area. The calculated indentation curves were compared with the indentation curves obtained by experiment and the impact of the indenter tilt to the indentation curves was determined by the comparing of the maximal forces and the shapes of the indentation curves.
[klicova_slova] => nanoindentation, indenter shape deviations, indenter tilt, indenter bluntness
[klicova_slova_orig] => nanoindentation, indenter shape deviations, indenter tilt, indenter bluntness
[url] => https://sciendo.com/article/10.2478/pmp-2022-0007
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[citace_text] => KOVÁŘ, J.; FUIS, V.; ČTVRTLÍK, R.; TOMÁŠTÍK, J. Influencing the Indentation Curves by the Tilt of the Berkovich Indenter at FEM Modelling of the Steel Nanoindentation. Powder Metallurgy Progress, 2023, vol. 22, no. 1, p. 53-61. ISSN: 1335-8987.
[citace_html] => KOVÁŘ, J.; FUIS, V.; ČTVRTLÍK, R.; TOMÁŠTÍK, J. Influencing the Indentation Curves by the Tilt of the Berkovich Indenter at FEM Modelling of the Steel Nanoindentation. Powder Metallurgy Progress, 2023, vol. 22, no. 1, p. 53-61. ISSN: 1335-8987.
[citace_rtf] =>
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author="Jaroslav {Kovář} and Vladimír {Fuis} and Radim {Čtvrtlík} and Jan {Tomáštík}",
title="Influencing the Indentation Curves by the Tilt of the Berkovich Indenter at FEM Modelling of the Steel Nanoindentation",
journal="Powder Metallurgy Progress",
year="2023",
volume="22",
number="1",
pages="53--61",
doi="10.2478/pmp-2022-0007",
issn="1335-8987",
url="https://sciendo.com/article/10.2478/pmp-2022-0007"
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[nazev_en] => Influencing the Indentation Curves by the Tilt of the Berkovich Indenter at FEM Modelling of the Steel Nanoindentation
[popis_en] => The influence of the Berkovich indenter tilt on the results of the FEM modelling of steel nanoindentation is evaluated in this paper. The shape deviations of the indenter have a great impact on the results of the nanoindentation. The main deviations are the indenter bluntness and indenter tilt. The indenter tilt has an impact on the shape of the contact area and the shape of indentation curves. The X5CrNiCuNb 16-4 steel nanoindentation with Berkovich indenter was modelled and the indentation curves were obtained. The Berkovich indenter was blunted and the tilt of the indenter was changed to determine the influence of the indentation curves by the indenter tilt. The plasticity of the steel was modelled with the multilinear model of material, which was fitted to the data from tensile test. The results showed that growing tilt shifts the indentation curves to higher values of indentation forces and makes unloading curves slightly steeper which is in the agreement with larger contact area. The calculated indentation curves were compared with the indentation curves obtained by experiment and the impact of the indenter tilt to the indentation curves was determined by the comparing of the maximal forces and the shapes of the indentation curves.
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