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[popis] => Mechanical properties of the arterial wall depend largely on orientation and density of collagen fiber bundles. Several methods have been developed for observation of collagen orientation and density; the most frequently applied collagen-specific manual approach is based on polarized light (PL). However, it is very time consuming and the results are operator dependent. We have proposed a new automated method for evaluation of collagen fiber direction from two-dimensional polarized light microscopy images (2D PLM). The algorithm has been verified against artificial images and validated against manual measurements. Finally the collagen content has been estimated. The proposed algorithm was capable of estimating orientation of some 35 k points in 15 min when applied to aortic tissue and over 500 k points in 35 min for Achilles tendon. The average angular disagreement between each operator and the algorithm was -9.3±8.6° and -3.8±8.6° in the case of aortic tissue and -1.6±6.4° and 2.6±7.8° for Achilles tendon. Estimated mean collagen content was 30.3±5.8% and 94.3±2.7% for aortic media and Achilles tendon, respectively. The proposed automated approach is operator independent and several orders faster than manual measurements and therefore has the potential to replace manual measurements of collagen orientation via PLM.
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[citace_text] => LEGUILLON, D.; MARTIN, É.; ŠEVEČEK, O.; BERMEJO, R. Application of the coupled stress-energy criterion to predict the fracture behaviour of layered ceramics designed with internal compressive stresses. European journal of mechanics, A, Solids, 2015, vol. 2015, no. 54, p. 94-104. ISSN: 0997-7538.
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[popis] => The contribution deals with a description of the specific crack behaviour in the layered alumina-zirconia ceramic laminate. The main aim is to clarify crack behaviour in the compressive layer and provide computational tools for estimation of crack behaviour in the field of strong residual stresses. The crack propagation was investigated on the basis of linear elastic fracture mechanics. Fracture parameters were computed numerically. Finite element models were developed in order to obtain a stress distribution in the laminate containing a crack and to simulate crack propagation. The sharp change of the crack propagation direction was estimated using criterion based on the strain energy density factor. Generalized linear elastic fracture mechanics was applied in the case of crack touching the material interface. Estimated crack behaviour is qualitatively in a good agreement with experimental observations.
[popis_orig] => The contribution deals with a description of the specific crack behaviour in the layered alumina-zirconia ceramic laminate. The main aim is to clarify crack behaviour in the compressive layer and provide computational tools for estimation of crack behaviour in the field of strong residual stresses. The crack propagation was investigated on the basis of linear elastic fracture mechanics. Fracture parameters were computed numerically. Finite element models were developed in order to obtain a stress distribution in the laminate containing a crack and to simulate crack propagation. The sharp change of the crack propagation direction was estimated using criterion based on the strain energy density factor. Generalized linear elastic fracture mechanics was applied in the case of crack touching the material interface. Estimated crack behaviour is qualitatively in a good agreement with experimental observations.
[klicova_slova] => Layered ceramic composites, residual stresses, crack propagation, strain energy density factor.
[klicova_slova_orig] => Layered ceramic composites, residual stresses, crack propagation, strain energy density factor.
[url] =>
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[odpovedny_utvar_nazev] => Institute of Solid Mechanics, Mechatronics and Biomechanics
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[nadrazena_soucast_zkratka] => FME
[nadrazena_soucast_nazev] => Faculty of Mechanical Engineering
[originalni_jazyk] => en
[schvalil_id] => 116121
[schvaleno] => 2015-11-07
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[vycet_osob] => ŠTEGNEROVÁ, K.; NÁHLÍK, L.; HUTAŘ, P.
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[identifikator] => ISBN 978-80-87434-07-9
[identifikator_popis] => ISBN - ICSMA 17 Book of Abstracts
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[citace_text] => ŠTEGNEROVÁ, K.; NÁHLÍK, L.; HUTAŘ, P. Estimation of crack behaviour in the ceramic laminate with strong interfaces. ICSMA 17 Book of Abstracts. Brno: Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Brno, Czech Republic, 2015. p. 288-288. ISBN: 978-80-87434-07-9.
[citace_html] => ŠTEGNEROVÁ, K.; NÁHLÍK, L.; HUTAŘ, P. Estimation of crack behaviour in the ceramic laminate with strong interfaces. ICSMA 17 Book of Abstracts. Brno: Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Brno, Czech Republic, 2015. p. 288-288. ISBN: 978-80-87434-07-9.
[citace_rtf] =>
[citace_bibtex] => @misc{BUT115363,
author="Kateřina {Štegnerová} and Luboš {Náhlík} and Pavel {Hutař}",
title="Estimation of crack behaviour in the ceramic laminate with strong interfaces",
booktitle="ICSMA 17 Book of Abstracts",
year="2015",
pages="288--288",
publisher="Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Brno, Czech Republic",
address="Brno",
isbn="978-80-87434-07-9",
note="Abstract"
}
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[nazev_en] => Estimation of crack behaviour in the ceramic laminate with strong interfaces
[popis_en] => The contribution deals with a description of the specific crack behaviour in the layered alumina-zirconia ceramic laminate. The main aim is to clarify crack behaviour in the compressive layer and provide computational tools for estimation of crack behaviour in the field of strong residual stresses. The crack propagation was investigated on the basis of linear elastic fracture mechanics. Fracture parameters were computed numerically. Finite element models were developed in order to obtain a stress distribution in the laminate containing a crack and to simulate crack propagation. The sharp change of the crack propagation direction was estimated using criterion based on the strain energy density factor. Generalized linear elastic fracture mechanics was applied in the case of crack touching the material interface. Estimated crack behaviour is qualitatively in a good agreement with experimental observations.
[klicova_slova_en] => Layered ceramic composites, residual stresses, crack propagation, strain energy density factor.
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)
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[nazev] => Influence of Threshold Values on Residual Fatigue Lifetime of Railway Axles under Variable Amplitude Loading
[nazev_orig] => Influence of Threshold Values on Residual Fatigue Lifetime of Railway Axles under Variable Amplitude Loading
[duvernost_udaju_id] => S
[popis] => The paper deals with an estimation of residual fatigue lifetime of railway axles under real loading spectrum. The residual fatigue lifetime is given by magnitude of fatigue crack propagation rate. This rate depends predominantly on load, geometry and material of the axle. Standard steel EA4T for manufacturing of railway axles is considered in this paper. The scatter of data in v-K curve could be caused by inaccuracy of experimental measurement or by local change of material properties. The paper shows important differences between obtained residual fatigue lifetime estimations considering scatter in measured material data, especially near the threshold region.
[popis_orig] => The paper deals with an estimation of residual fatigue lifetime of railway axles under real loading spectrum. The residual fatigue lifetime is given by magnitude of fatigue crack propagation rate. This rate depends predominantly on load, geometry and material of the axle. Standard steel EA4T for manufacturing of railway axles is considered in this paper. The scatter of data in v-K curve could be caused by inaccuracy of experimental measurement or by local change of material properties. The paper shows important differences between obtained residual fatigue lifetime estimations considering scatter in measured material data, especially near the threshold region.
[klicova_slova] => railway axle; residual fatigue lifetime; fatigue crack; EA4T
[klicova_slova_orig] => railway axle; residual fatigue lifetime; fatigue crack; EA4T
[url] => https://www.sciencedirect.com/science/article/pii/S187770581500644X
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[citace_text] => POKORNÝ, P.; NÁHLÍK, L.; HUTAŘ, P. Influence of Threshold Values on Residual Fatigue Lifetime of Railway Axles under Variable Amplitude Loading. Procedia Engineering, 2015, vol. 101, no. 1, p. 380-385. ISSN: 1877-7058.
[citace_html] => POKORNÝ, P.; NÁHLÍK, L.; HUTAŘ, P. Influence of Threshold Values on Residual Fatigue Lifetime of Railway Axles under Variable Amplitude Loading. Procedia Engineering, 2015, vol. 101, no. 1, p. 380-385. ISSN: 1877-7058.
[citace_rtf] =>
[citace_bibtex] => @article{BUT115432,
author="Pavel {Pokorný} and Luboš {Náhlík} and Pavel {Hutař}",
title="Influence of Threshold Values on Residual Fatigue Lifetime of Railway Axles under Variable Amplitude Loading",
journal="Procedia Engineering",
year="2015",
volume="101",
number="1",
pages="380--385",
doi="10.1016/j.proeng.2015.02.046",
url="https://www.sciencedirect.com/science/article/pii/S187770581500644X"
}
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[nazev_en] => Influence of Threshold Values on Residual Fatigue Lifetime of Railway Axles under Variable Amplitude Loading
[popis_en] => The paper deals with an estimation of residual fatigue lifetime of railway axles under real loading spectrum. The residual fatigue lifetime is given by magnitude of fatigue crack propagation rate. This rate depends predominantly on load, geometry and material of the axle. Standard steel EA4T for manufacturing of railway axles is considered in this paper. The scatter of data in v-K curve could be caused by inaccuracy of experimental measurement or by local change of material properties. The paper shows important differences between obtained residual fatigue lifetime estimations considering scatter in measured material data, especially near the threshold region.
[klicova_slova_en] => railway axle; residual fatigue lifetime; fatigue crack; EA4T
[vysledek_datum] => 2015-03-20T00:00:00+01:00
)
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(
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[nazev] => Residual fatigue lifetime estimation of railway axles for various loading spectra
[nazev_orig] => Residual fatigue lifetime estimation of railway axles for various loading spectra
[duvernost_udaju_id] => S
[popis] => The knowledge of the residual fatigue lifetime of railway axles is very important for the safe operation of trains. The railway axles could include some defects like cracks, scratches or inhomogeneities which could contribute to the fatigue crack initiation and in the final stage to axle failure. The non-destructive testing methods are not reliable for detection of relatively short (circa 1-2 mm), but even dangerous cracks. For conservative estimation of residual fatigue lifetime the railway axle containing initial crack should be considered. The residual fatigue lifetime is given by the number of load cycles for fatigue crack growth from the initial size of the crack up to the critical size with consequent fatigue failure of railway axle. Railway axles are used in different types of trains which are used under different conditions (regional trains, urban trains, high speed trains, freight trains etc.). This work is focused on numerical estimation of residual fatigue lifetime of railway axle while several different load spectra taken from the literature are considered in the performed estimations. This paper also shows the influence of the discretization level of the continuous load spectrum and effect of magnification or diminution of load spectrum on the calculated residual fatigue lifetime of the railway axle.
[popis_orig] => The knowledge of the residual fatigue lifetime of railway axles is very important for the safe operation of trains. The railway axles could include some defects like cracks, scratches or inhomogeneities which could contribute to the fatigue crack initiation and in the final stage to axle failure. The non-destructive testing methods are not reliable for detection of relatively short (circa 1-2 mm), but even dangerous cracks. For conservative estimation of residual fatigue lifetime the railway axle containing initial crack should be considered. The residual fatigue lifetime is given by the number of load cycles for fatigue crack growth from the initial size of the crack up to the critical size with consequent fatigue failure of railway axle. Railway axles are used in different types of trains which are used under different conditions (regional trains, urban trains, high speed trains, freight trains etc.). This work is focused on numerical estimation of residual fatigue lifetime of railway axle while several different load spectra taken from the literature are considered in the performed estimations. This paper also shows the influence of the discretization level of the continuous load spectrum and effect of magnification or diminution of load spectrum on the calculated residual fatigue lifetime of the railway axle.
[klicova_slova] => Fatigue failure; Residual fatigue lifetime; Crack propagation; Railway axle; Load spectrum
[klicova_slova_orig] => Fatigue failure; Residual fatigue lifetime; Crack propagation; Railway axle; Load spectrum
[url] => https://www.sciencedirect.com/science/article/pii/S0167844215202017
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[citace_text] => POKORNÝ, P.; HUTAŘ, P.; NÁHLÍK, L. Residual fatigue lifetime estimation of railway axles for various loading spectra. THEORETICAL AND APPLIED FRACTURE MECHANICS, 2016, no. 81, p. 25-32. ISSN: 0167-8442.
[citace_html] => POKORNÝ, P.; HUTAŘ, P.; NÁHLÍK, L. Residual fatigue lifetime estimation of railway axles for various loading spectra. THEORETICAL AND APPLIED FRACTURE MECHANICS, 2016, no. 81, p. 25-32. ISSN: 0167-8442.
[citace_rtf] =>
[citace_bibtex] => @article{BUT115433,
author="Pavel {Pokorný} and Pavel {Hutař} and Luboš {Náhlík}",
title="Residual fatigue lifetime estimation of railway axles for various loading spectra",
journal="THEORETICAL AND APPLIED FRACTURE MECHANICS",
year="2016",
number="81",
pages="25--32",
doi="10.1016/j.tafmec.2015.06.007",
issn="0167-8442",
url="https://www.sciencedirect.com/science/article/pii/S0167844215202017"
}
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[poznamka_metriky] =>
[nazev_en] => Residual fatigue lifetime estimation of railway axles for various loading spectra
[popis_en] => The knowledge of the residual fatigue lifetime of railway axles is very important for the safe operation of trains. The railway axles could include some defects like cracks, scratches or inhomogeneities which could contribute to the fatigue crack initiation and in the final stage to axle failure. The non-destructive testing methods are not reliable for detection of relatively short (circa 1-2 mm), but even dangerous cracks. For conservative estimation of residual fatigue lifetime the railway axle containing initial crack should be considered. The residual fatigue lifetime is given by the number of load cycles for fatigue crack growth from the initial size of the crack up to the critical size with consequent fatigue failure of railway axle. Railway axles are used in different types of trains which are used under different conditions (regional trains, urban trains, high speed trains, freight trains etc.). This work is focused on numerical estimation of residual fatigue lifetime of railway axle while several different load spectra taken from the literature are considered in the performed estimations. This paper also shows the influence of the discretization level of the continuous load spectrum and effect of magnification or diminution of load spectrum on the calculated residual fatigue lifetime of the railway axle.
[klicova_slova_en] => Fatigue failure; Residual fatigue lifetime; Crack propagation; Railway axle; Load spectrum
[vysledek_datum] => 2016-04-01T00:00:00+02:00
)
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[nazev] => Biomechanical Testing of Spinal Segment Fixed by Arcofix System on the Swine Spine
[nazev_orig] => Biomechanical Testing of Spinal Segment Fixed by Arcofix System on the Swine Spine
[duvernost_udaju_id] => S
[popis] => To evaluate the mechanical properties of the spinal segment in the intact, injured, and stabilized state after fixation by an Arcofix implant. Several types of thoracolumbar spine injury necessitates anterior instrumentation. The Arcofix plate represents the latest generation of angular stablity systems. The biomechanical properties of these implants have not been sufficiently studied yet. A total of ten porcine specimens (levels Th12-L3) were prepared. The tests were performed for intact, injured, and implanted specimens. In each state, the specimen was subjected to a tension load of a prescribed force, and subsequently, twisted by a given angle. The force load was 200 N. The torsion load had a deformation character, i.e., the control variable was the twisting angle and the measured variable was the moment of a couple. The amplitude of the load alternating cycle was 3°. Another parameter that was evaluated was the area of the hysteresis loop. The area corresponds to the deformation energy which is dissipated during the cycle. A statistically significant difference was found between the intact and injured states as well as between the injured and implanted specimens. The statistical evaluation also showed a statistically different value of the hysteresis loop area. In the case of instability, the area decreased to 33% of the physiological value. For the implanted sample, the area increased to 170% of the physiological value. The Arcofix implant with its parameters appears to be suitable and sufficiently stable for the treatment of the anterior column of the spine.
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[citace_rtf] =>
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