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[popis] => This computational study investigates the effect of shape (defect contour curvature) and bone-implant interface (osteotomy angle) on the stress distribution within PMMA skull implants. Using finite element methodology, 15 configurations – combinations of simplified synthetic geometric shapes (circular, square, triangular, irregular) and interface angulations – were simulated under 50N static loads. Furthermore, the implant fixation devices were modelled and analysed in detail. Negative osteotomy configurations demonstrated the largest stresses in the implant (275 MPa), fixation devices (1258 MPa) and bone strains (0.04). The circular implant with zero and positive osteotomy performed well with maximum observed magnitudes of – implant stress (1.2 MPa and 1.2 MPa), fixation device stress (11.2 MPa and 2.2 MPa), bone strain (0.218e-3 and 0.750e-4). The results suggest that the preparation of defect sites is a critical procedure. Of the greatest importance is the angle at which the edges of the defect are sawed. If under an external load, the implant has no support from the interface and the stresses are transferred to the fixation devices. This can endanger their material integrity and lead to unphysiological strains in the adjacent bone, potentially compromising the bone morphology required for anchoring. These factors can ultimately weaken the stability of the entire implant assembly.
[popis_orig] => This computational study investigates the effect of shape (defect contour curvature) and bone-implant interface (osteotomy angle) on the stress distribution within PMMA skull implants. Using finite element methodology, 15 configurations – combinations of simplified synthetic geometric shapes (circular, square, triangular, irregular) and interface angulations – were simulated under 50N static loads. Furthermore, the implant fixation devices were modelled and analysed in detail. Negative osteotomy configurations demonstrated the largest stresses in the implant (275 MPa), fixation devices (1258 MPa) and bone strains (0.04). The circular implant with zero and positive osteotomy performed well with maximum observed magnitudes of – implant stress (1.2 MPa and 1.2 MPa), fixation device stress (11.2 MPa and 2.2 MPa), bone strain (0.218e-3 and 0.750e-4). The results suggest that the preparation of defect sites is a critical procedure. Of the greatest importance is the angle at which the edges of the defect are sawed. If under an external load, the implant has no support from the interface and the stresses are transferred to the fixation devices. This can endanger their material integrity and lead to unphysiological strains in the adjacent bone, potentially compromising the bone morphology required for anchoring. These factors can ultimately weaken the stability of the entire implant assembly.
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year="2015",
journal="Key Engineering Materials (print)",
volume="665",
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publisher="Trans Tech Publications",
address="Pfaffikon, Switzerland",
doi="10.4028/www.scientific.net/KEM.665.105",
issn="1013-9826",
url="http://www.scientific.net/KEM.665.105"
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[popis] => The response to the mechanical loading of bone tissue has been extensively investigated; however, precisely how much strain intensity is necessary to promote bone formation remains unclear. Combination studies utilizing histomorphometric and numerical analyses were performed using the established murine maxilla loading model to clarify the threshold of mechanical strain needed to accelerate bone formation activity. For 7 days, 191 kPa loading stimulation for 30 min/day was applied to C57BL/6J mice. Two regions of interest, the AWAY region (away from the loading site) and the NEAR region (near the loading site), were determined. The inflammatory score increased in the NEAR region, but not in the AWAY region. A strain intensity map obtained from microCT images was superimposed onto the images of the bone formation inhibitor, sclerostin-positive cell localization. The number of sclerostin-positive cells significantly decreased after mechanical loading of more than 150 micro strain in the AWAY region, but not in the NEAR region. The mineral apposition rate, which shows the bone formation ability of osteoblasts, was accelerated at the site of surface strain intensity, namely around 170 micro strain, but not at the site of lower surface strain intensity, which was around 80 micro strain in the AWAY region, thus suggesting the existence of a strain intensity threshold for promoting bone formation. Taken together, our data suggest that a threshold of mechanical strain intensity for the direct activation of osteoblast function and the reduction of sclerostin exists in a murine maxilla loading model in the non-inflammatory region.
[popis_orig] => The response to the mechanical loading of bone tissue has been extensively investigated; however, precisely how much strain intensity is necessary to promote bone formation remains unclear. Combination studies utilizing histomorphometric and numerical analyses were performed using the established murine maxilla loading model to clarify the threshold of mechanical strain needed to accelerate bone formation activity. For 7 days, 191 kPa loading stimulation for 30 min/day was applied to C57BL/6J mice. Two regions of interest, the AWAY region (away from the loading site) and the NEAR region (near the loading site), were determined. The inflammatory score increased in the NEAR region, but not in the AWAY region. A strain intensity map obtained from microCT images was superimposed onto the images of the bone formation inhibitor, sclerostin-positive cell localization. The number of sclerostin-positive cells significantly decreased after mechanical loading of more than 150 micro strain in the AWAY region, but not in the NEAR region. The mineral apposition rate, which shows the bone formation ability of osteoblasts, was accelerated at the site of surface strain intensity, namely around 170 micro strain, but not at the site of lower surface strain intensity, which was around 80 micro strain in the AWAY region, thus suggesting the existence of a strain intensity threshold for promoting bone formation. Taken together, our data suggest that a threshold of mechanical strain intensity for the direct activation of osteoblast function and the reduction of sclerostin exists in a murine maxilla loading model in the non-inflammatory region.
[klicova_slova] => Mechanical strain intensity, Murine maxilla, Bone formation, Inflammation, Sclerostin, Numerical analysis
[klicova_slova_orig] => Mechanical strain intensity, Murine maxilla, Bone formation, Inflammation, Sclerostin, Numerical analysis
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[citace_text] => SUZUKI, N.; AOKI, K.; MARCIÁN, P.; BORÁK, L.; WAKABAYASHI, N. A threshold of mechanical strain intensity for the direct activation of osteoblast function exists in a murine maxilla loading model. Biomechanics and Modeling in Mechanobiology, 2016, vol. 15, no. 5, p. 1091-1100. ISSN: 1617-7959.
[citace_html] => SUZUKI, N.; AOKI, K.; MARCIÁN, P.; BORÁK, L.; WAKABAYASHI, N. A threshold of mechanical strain intensity for the direct activation of osteoblast function exists in a murine maxilla loading model. Biomechanics and Modeling in Mechanobiology, 2016, vol. 15, no. 5, p. 1091-1100. ISSN: 1617-7959.
[citace_rtf] =>
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author="Natsuki {Suzuki} and Kazuhiro {Aoki} and Petr {Marcián} and Libor {Borák} and Noriyuki {WAKABAYASHI}",
title="A threshold of mechanical strain intensity for the direct activation of osteoblast function exists in a murine maxilla loading model",
journal="Biomechanics and Modeling in Mechanobiology",
year="2016",
volume="15",
number="5",
pages="1091--1100",
doi="10.1007/s10237-015-0746-1",
issn="1617-7959",
url="http://link.springer.com/article/10.1007/s10237-015-0746-1"
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[nazev_en] => A threshold of mechanical strain intensity for the direct activation of osteoblast function exists in a murine maxilla loading model
[popis_en] => The response to the mechanical loading of bone tissue has been extensively investigated; however, precisely how much strain intensity is necessary to promote bone formation remains unclear. Combination studies utilizing histomorphometric and numerical analyses were performed using the established murine maxilla loading model to clarify the threshold of mechanical strain needed to accelerate bone formation activity. For 7 days, 191 kPa loading stimulation for 30 min/day was applied to C57BL/6J mice. Two regions of interest, the AWAY region (away from the loading site) and the NEAR region (near the loading site), were determined. The inflammatory score increased in the NEAR region, but not in the AWAY region. A strain intensity map obtained from microCT images was superimposed onto the images of the bone formation inhibitor, sclerostin-positive cell localization. The number of sclerostin-positive cells significantly decreased after mechanical loading of more than 150 micro strain in the AWAY region, but not in the NEAR region. The mineral apposition rate, which shows the bone formation ability of osteoblasts, was accelerated at the site of surface strain intensity, namely around 170 micro strain, but not at the site of lower surface strain intensity, which was around 80 micro strain in the AWAY region, thus suggesting the existence of a strain intensity threshold for promoting bone formation. Taken together, our data suggest that a threshold of mechanical strain intensity for the direct activation of osteoblast function and the reduction of sclerostin exists in a murine maxilla loading model in the non-inflammatory region.
[klicova_slova_en] => Mechanical strain intensity, Murine maxilla, Bone formation, Inflammation, Sclerostin, Numerical analysis
[vysledek_datum] => 2016-10-01T00:00:00+02:00
)
[3] => Array
(
[vysledek_id] => 118969
[vysledek_druh_id] => ARTWOS
[ex_vysledek_id] => 116545
[vysledek_rok] => 2015
[nazev] => Biomechanical rupture risk assessment of abdominal aortic aneurysms based on a novel probabilistic rupture risk index
[nazev_orig] => Biomechanical rupture risk assessment of abdominal aortic aneurysms based on a novel probabilistic rupture risk index
[duvernost_udaju_id] => S
[popis] => Background. A rupture risk assessment is critical to the clinical treatment of Abdominal Aortic Aneurysm (AAA) patients. The biomechanical AAA rupture risk assessment quantitatively integrates many known AAA rupture risk factors but the variability of risk predictions due to model input uncertainties remains a challenging limitation.
Methods. The present study derives a Probabilistic Rupture Risk Index (PRRI). Specifically, the uncertainties in AAA wall thickness and wall strength were considered, and wall stress was predicted with a state-of-the-art deterministic biomechanical model. The discriminative power of PRRI was tested in a diameter-matched cohort of ruptured (n=7) and intact (n=7) AAAs and compared to alternative risk assessment methods.
Results. Computed PRRI at 1.5 Mean Arterial Pressure was significantly (p=0.041) higher in ruptured AAAs (20.21(SD14.15%) than in intact AAAs (3.71(SD 5.77)%). PRRI showed a high sensitivity and specificity (discriminative power of 0.837) to discriminate between ruptured and intact AAA cases. The underlying statistical representation of stochastic data of wall thickness, wall strength and Peak Wall Stress (PWS) had only negligible effects on PRRI computations.
Conclusion. Uncertainties in AAA wall stress predictions, the wide range of reported wall strength and the stochastic nature of failure motivate a probabilistic rupture risk assessment. Advanced AAA biomechanical modeling paired with a probabilistic rupture index definition as known from engineering risk assessment seems to be superior to a purely deterministic approach.
[popis_orig] => Background. A rupture risk assessment is critical to the clinical treatment of Abdominal Aortic Aneurysm (AAA) patients. The biomechanical AAA rupture risk assessment quantitatively integrates many known AAA rupture risk factors but the variability of risk predictions due to model input uncertainties remains a challenging limitation.
Methods. The present study derives a Probabilistic Rupture Risk Index (PRRI). Specifically, the uncertainties in AAA wall thickness and wall strength were considered, and wall stress was predicted with a state-of-the-art deterministic biomechanical model. The discriminative power of PRRI was tested in a diameter-matched cohort of ruptured (n=7) and intact (n=7) AAAs and compared to alternative risk assessment methods.
Results. Computed PRRI at 1.5 Mean Arterial Pressure was significantly (p=0.041) higher in ruptured AAAs (20.21(SD14.15%) than in intact AAAs (3.71(SD 5.77)%). PRRI showed a high sensitivity and specificity (discriminative power of 0.837) to discriminate between ruptured and intact AAA cases. The underlying statistical representation of stochastic data of wall thickness, wall strength and Peak Wall Stress (PWS) had only negligible effects on PRRI computations.
Conclusion. Uncertainties in AAA wall stress predictions, the wide range of reported wall strength and the stochastic nature of failure motivate a probabilistic rupture risk assessment. Advanced AAA biomechanical modeling paired with a probabilistic rupture index definition as known from engineering risk assessment seems to be superior to a purely deterministic approach.
[klicova_slova] => abdominal aortic aneurysm; uncertainty;
model finite element; failure; wall stress;
[klicova_slova_orig] => abdominal aortic aneurysm; uncertainty;
model finite element; failure; wall stress;
[url] => http://rsif.royalsocietypublishing.org/content/12/113/20150852
[oecd_obor_id] => 10610
[odpovedny_utvar_id] => 157
[odpovedny_utvar_nazev] => Institute of Solid Mechanics, Mechatronics and Biomechanics
[odpovedny_utvar_zkratka] => ISMMB
[nadrazena_soucast_id] => 4
[nadrazena_soucast_zkratka] => FME
[nadrazena_soucast_nazev] => Faculty of Mechanical Engineering
[originalni_jazyk] => en
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[poznamka] =>
[typ_nazev] =>
[kod_doi] => 10.1098/rsif.2015.0852
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[zverejneno] => 1
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[kategorie_nazev] => Publication results
[druh_nazev] => WoS Article
[druh_popis] => Peer-reviewed article included in Web of Science database as as an “Article”, “Review” or “Letter”
[stav] => Approved
[vysledek_kategorie_id] => PV
[vysledek_system_kategorie_id] => PU
[vysledek_stav_id] => 3
[vlozil] => Informační systém Automat
[upravil] => Informační systém Automat
[ins_uid] => 999999
[upd_uid] => 999999
[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[identifikator] => ISSN 1742-5689
[identifikator_popis] => ISSN - Journal of the Royal Society Interface (GB)
[riv_dodavka_id] => 1287
[riv_dodavka_oznaceni] => RIV16-GA0-26210___
[riv_dodavka_rok] => 2016
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[citace_text] => POLZER, S.; GASSER, T. Biomechanical rupture risk assessment of abdominal aortic aneurysms based on a novel probabilistic rupture risk index. Journal of the Royal Society Interface, 2015, vol. 113, no. 12, p. 1-11. ISSN: 1742-5689.
[citace_html] => POLZER, S.; GASSER, T. Biomechanical rupture risk assessment of abdominal aortic aneurysms based on a novel probabilistic rupture risk index. Journal of the Royal Society Interface, 2015, vol. 113, no. 12, p. 1-11. ISSN: 1742-5689.
[citace_rtf] =>
[citace_bibtex] => @article{BUT118969,
author="Stanislav {Polzer} and Thomas Christian {Gasser}",
title="Biomechanical rupture risk assessment of abdominal aortic aneurysms based on a novel probabilistic rupture risk index",
journal="Journal of the Royal Society Interface",
year="2015",
volume="113",
number="12",
pages="1--11",
doi="10.1098/rsif.2015.0852",
issn="1742-5689",
url="http://rsif.royalsocietypublishing.org/content/12/113/20150852"
}
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[nazev_en] => Biomechanical rupture risk assessment of abdominal aortic aneurysms based on a novel probabilistic rupture risk index
[popis_en] => Background. A rupture risk assessment is critical to the clinical treatment of Abdominal Aortic Aneurysm (AAA) patients. The biomechanical AAA rupture risk assessment quantitatively integrates many known AAA rupture risk factors but the variability of risk predictions due to model input uncertainties remains a challenging limitation.
Methods. The present study derives a Probabilistic Rupture Risk Index (PRRI). Specifically, the uncertainties in AAA wall thickness and wall strength were considered, and wall stress was predicted with a state-of-the-art deterministic biomechanical model. The discriminative power of PRRI was tested in a diameter-matched cohort of ruptured (n=7) and intact (n=7) AAAs and compared to alternative risk assessment methods.
Results. Computed PRRI at 1.5 Mean Arterial Pressure was significantly (p=0.041) higher in ruptured AAAs (20.21(SD14.15%) than in intact AAAs (3.71(SD 5.77)%). PRRI showed a high sensitivity and specificity (discriminative power of 0.837) to discriminate between ruptured and intact AAA cases. The underlying statistical representation of stochastic data of wall thickness, wall strength and Peak Wall Stress (PWS) had only negligible effects on PRRI computations.
Conclusion. Uncertainties in AAA wall stress predictions, the wide range of reported wall strength and the stochastic nature of failure motivate a probabilistic rupture risk assessment. Advanced AAA biomechanical modeling paired with a probabilistic rupture index definition as known from engineering risk assessment seems to be superior to a purely deterministic approach.
[klicova_slova_en] => abdominal aortic aneurysm; uncertainty;
model finite element; failure; wall stress;
[vysledek_datum] => 2015-12-02T00:00:00+01:00
)
[4] => Array
(
[vysledek_id] => 119251
[vysledek_druh_id] => ARTWOS
[ex_vysledek_id] => 116672
[vysledek_rok] => 2015
[nazev] => Incidence of small abdominal aortic aneurysms rupture, impact of comorbidities and our experience with rupture risk prediction based on wall stress assessment
[nazev_orig] => Incidence of small abdominal aortic aneurysms rupture, impact of comorbidities and our experience with rupture risk prediction based on wall stress assessment
[duvernost_udaju_id] => S
[popis] => Aim
Abdominal aortic aneurysm rupture (AAA) threatens a patient's life, requiring an urgent open repair or endovascular surgery. If an asymptomatic AAA is found before a rupture the next steps are directed by its diameter – if it is less than 55 mm the patient is dispensarized, and if it is more a repair is indicated. According to literary sources 10–24% of ruptured AAA are less than 55 mm in diameter, thus a significant portion of dispensarized patients are threatened by a rupture. The objective of our study was to determine a portion of small ruptured AAA repaired in our center in the last four years and try to identify potential risk factor. The secondary goal was to show our experience with a modern method of rupture prediction, using CT scans to compute the wall stress of AAA and thus predict its rupture risk.
Methods
A retrospective study of documentation of patients with ruptured AAA in last four years. CT findings were used to measure maximal diameter of ruptured AAA and portion of small AAA was determined. Some other important information from patient's medical history were also compared in both groups and statistically evaluated.
Results
41 patients underwent an open repair of ruptured AAA. Out of this number 7 ruptured AAA were small, which is equivalent to 17.1%.
Conclusion
This finding shows us the shortages of the present indication criteria based on an AAA diameter. In accordance to these criteria patients with small AAA are dispensarized and thus a significant part of them are in risk of rupture.
[popis_orig] => Aim
Abdominal aortic aneurysm rupture (AAA) threatens a patient's life, requiring an urgent open repair or endovascular surgery. If an asymptomatic AAA is found before a rupture the next steps are directed by its diameter – if it is less than 55 mm the patient is dispensarized, and if it is more a repair is indicated. According to literary sources 10–24% of ruptured AAA are less than 55 mm in diameter, thus a significant portion of dispensarized patients are threatened by a rupture. The objective of our study was to determine a portion of small ruptured AAA repaired in our center in the last four years and try to identify potential risk factor. The secondary goal was to show our experience with a modern method of rupture prediction, using CT scans to compute the wall stress of AAA and thus predict its rupture risk.
Methods
A retrospective study of documentation of patients with ruptured AAA in last four years. CT findings were used to measure maximal diameter of ruptured AAA and portion of small AAA was determined. Some other important information from patient's medical history were also compared in both groups and statistically evaluated.
Results
41 patients underwent an open repair of ruptured AAA. Out of this number 7 ruptured AAA were small, which is equivalent to 17.1%.
Conclusion
This finding shows us the shortages of the present indication criteria based on an AAA diameter. In accordance to these criteria patients with small AAA are dispensarized and thus a significant part of them are in risk of rupture.
[klicova_slova] => Abdominal aortic aneurysm; Rupture; Small AAA; Prediction; Wall stress assessment
[klicova_slova_orig] => Abdominal aortic aneurysm; Rupture; Small AAA; Prediction; Wall stress assessment
[url] => http://www.sciencedirect.com/science/article/pii/S0010865015000168
[oecd_obor_id] => 30201
[odpovedny_utvar_id] => 157
[odpovedny_utvar_nazev] => Institute of Solid Mechanics, Mechatronics and Biomechanics
[odpovedny_utvar_zkratka] => ISMMB
[nadrazena_soucast_id] => 4
[nadrazena_soucast_zkratka] => FME
[nadrazena_soucast_nazev] => Faculty of Mechanical Engineering
[originalni_jazyk] => en
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[schvaleno] => 2019-08-08
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[slozka_id] =>
[posledni_diagnostika] =>
[vycet_osob] => Luboš Kubíčeka, Robert Staffa, Robert Vlachovský , Stanislav Polzer, Peter Kružliak
[pocet_tvurcu] => 5
[tvurci_ids] =>
[poznamka] =>
[typ_nazev] =>
[kod_doi] => 10.1016/j.crvasa.2015.02.005
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[zverejneno] => 1
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[korespondencni_autor] =>
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[znamka] =>
[kategorie_nazev] => Publication results
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[druh_popis] => Peer-reviewed article included in Web of Science database as as an “Article”, “Review” or “Letter”
[stav] => Approved
[vysledek_kategorie_id] => PV
[vysledek_system_kategorie_id] => PU
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[upravil] => Informační systém Automat
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[upd_uid] => 999999
[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
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[identifikator] => ISSN 0010-8650
[identifikator_popis] => ISSN - Cor et Vasa (CZ)
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[riv_dodavka_oznaceni] => RIV16-GA0-26210___
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[citace_text] => Luboš Kubíčeka, Robert Staffa, Robert Vlachovský , Stanislav Polzer, Peter Kružliak. Incidence of small abdominal aortic aneurysms rupture, impact of comorbidities and our experience with rupture risk prediction based on wall stress assessment. Cor et Vasa, 2015, vol. 57, no. 2, p. 127-132. ISSN: 0010-8650.
[citace_html] => Luboš Kubíčeka, Robert Staffa, Robert Vlachovský , Stanislav Polzer, Peter Kružliak. Incidence of small abdominal aortic aneurysms rupture, impact of comorbidities and our experience with rupture risk prediction based on wall stress assessment. Cor et Vasa, 2015, vol. 57, no. 2, p. 127-132. ISSN: 0010-8650.
[citace_rtf] =>
[citace_bibtex] => @article{BUT119251,
author="Stanislav {Polzer}",
title="Incidence of small abdominal aortic aneurysms rupture, impact of comorbidities and our experience with rupture risk prediction based on wall stress assessment",
journal="Cor et Vasa",
year="2015",
volume="57",
number="2",
pages="127--132",
doi="10.1016/j.crvasa.2015.02.005",
issn="0010-8650",
url="http://www.sciencedirect.com/science/article/pii/S0010865015000168"
}
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[poznamka_metriky] =>
[nazev_en] => Incidence of small abdominal aortic aneurysms rupture, impact of comorbidities and our experience with rupture risk prediction based on wall stress assessment
[popis_en] => Aim
Abdominal aortic aneurysm rupture (AAA) threatens a patient's life, requiring an urgent open repair or endovascular surgery. If an asymptomatic AAA is found before a rupture the next steps are directed by its diameter – if it is less than 55 mm the patient is dispensarized, and if it is more a repair is indicated. According to literary sources 10–24% of ruptured AAA are less than 55 mm in diameter, thus a significant portion of dispensarized patients are threatened by a rupture. The objective of our study was to determine a portion of small ruptured AAA repaired in our center in the last four years and try to identify potential risk factor. The secondary goal was to show our experience with a modern method of rupture prediction, using CT scans to compute the wall stress of AAA and thus predict its rupture risk.
Methods
A retrospective study of documentation of patients with ruptured AAA in last four years. CT findings were used to measure maximal diameter of ruptured AAA and portion of small AAA was determined. Some other important information from patient's medical history were also compared in both groups and statistically evaluated.
Results
41 patients underwent an open repair of ruptured AAA. Out of this number 7 ruptured AAA were small, which is equivalent to 17.1%.
Conclusion
This finding shows us the shortages of the present indication criteria based on an AAA diameter. In accordance to these criteria patients with small AAA are dispensarized and thus a significant part of them are in risk of rupture.
[klicova_slova_en] => Abdominal aortic aneurysm; Rupture; Small AAA; Prediction; Wall stress assessment
[vysledek_datum] => 2015-03-12T00:00:00+01:00
)
[5] => Array
(
[vysledek_id] => 119302
[vysledek_druh_id] => CONPA
[ex_vysledek_id] => 116696
[vysledek_rok] => 2014
[nazev] => NUMERICAL ESTIMATION OF MICRO-CRACK PATHS IN POLYMER PARTICULATE COMPOSITE
[nazev_orig] => NUMERICAL ESTIMATION OF MICRO-CRACK PATHS IN POLYMER PARTICULATE COMPOSITE
[duvernost_udaju_id] => S
[popis] => Determination of composite mechanical behavior is one of important part during the composite tailoring. The aim of the present work was to estimate a micro-crack behavior in a polymer particulate composite. The composite was investigated by means of the finite element method -using ANSYS software. A two-dimensional three-phase finite element model was developed to analyze the crack growth behavior. The assumptions of the linear elastic fracture mechanics were considered and the Maximum Tangential Stress (MTS) criterion was used to predict the direction of the crack propagation. The effect of the elastic modulus of the interphase on the micro-crack propagation was investigated. The properties of matrix and particles were taken from experiment. It was shown that the interphase properties influence the stress intensity factor KI as well as the micro-crack paths. The results of this paper can contribute to a better understanding of the micro-crack propagation in particulate composites with respect to the interphase.
[popis_orig] => Determination of composite mechanical behavior is one of important part during the composite tailoring. The aim of the present work was to estimate a micro-crack behavior in a polymer particulate composite. The composite was investigated by means of the finite element method -using ANSYS software. A two-dimensional three-phase finite element model was developed to analyze the crack growth behavior. The assumptions of the linear elastic fracture mechanics were considered and the Maximum Tangential Stress (MTS) criterion was used to predict the direction of the crack propagation. The effect of the elastic modulus of the interphase on the micro-crack propagation was investigated. The properties of matrix and particles were taken from experiment. It was shown that the interphase properties influence the stress intensity factor KI as well as the micro-crack paths. The results of this paper can contribute to a better understanding of the micro-crack propagation in particulate composites with respect to the interphase.
[klicova_slova] => Polymer Composite; Fracture Mechanics; Interphase; Finite Element Method
[klicova_slova_orig] => Polymer Composite; Fracture Mechanics; Interphase; Finite Element Method
[url] =>
[oecd_obor_id] => 20306
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[odpovedny_utvar_nazev] => Institute of Solid Mechanics, Mechatronics and Biomechanics
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[druh_popis] => Paper in proceedings (conference paper)
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[ins_ts] => 2025-09-22
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[identifikator] => ISBN 978-80-214-4871-1
[identifikator_popis] => ISBN - Engineering Mechanics 2014
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[citace_text] => MAJER, Z.; NÁHLÍK, L. NUMERICAL ESTIMATION OF MICRO-CRACK PATHS IN POLYMER PARTICULATE COMPOSITE. In Engineering Mechanics 2014. 1. 2014. p. 376-379. ISBN: 978-80-214-4871-1.
[citace_html] => MAJER, Z.; NÁHLÍK, L. NUMERICAL ESTIMATION OF MICRO-CRACK PATHS IN POLYMER PARTICULATE COMPOSITE. In Engineering Mechanics 2014. 1. 2014. p. 376-379. ISBN: 978-80-214-4871-1.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT119302,
author="Zdeněk {Majer} and Luboš {Náhlík}",
title="NUMERICAL ESTIMATION OF MICRO-CRACK PATHS IN POLYMER PARTICULATE COMPOSITE",
booktitle="Engineering Mechanics 2014",
year="2014",
series="1",
number="2014",
pages="376--379",
isbn="978-80-214-4871-1"
}
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[oecd_tree_podobor_nazev] => Audio engineering, reliability analysis
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[nazev_en] => NUMERICAL ESTIMATION OF MICRO-CRACK PATHS IN POLYMER PARTICULATE COMPOSITE
[popis_en] => Determination of composite mechanical behavior is one of important part during the composite tailoring. The aim of the present work was to estimate a micro-crack behavior in a polymer particulate composite. The composite was investigated by means of the finite element method -using ANSYS software. A two-dimensional three-phase finite element model was developed to analyze the crack growth behavior. The assumptions of the linear elastic fracture mechanics were considered and the Maximum Tangential Stress (MTS) criterion was used to predict the direction of the crack propagation. The effect of the elastic modulus of the interphase on the micro-crack propagation was investigated. The properties of matrix and particles were taken from experiment. It was shown that the interphase properties influence the stress intensity factor KI as well as the micro-crack paths. The results of this paper can contribute to a better understanding of the micro-crack propagation in particulate composites with respect to the interphase.
[klicova_slova_en] => Polymer Composite; Fracture Mechanics; Interphase; Finite Element Method
[vysledek_datum] => 2014-05-12T00:00:00+02:00
)
[6] => Array
(
[vysledek_id] => 119426
[vysledek_druh_id] => ART
[ex_vysledek_id] => 116735
[vysledek_rok] => 2016
[nazev] => Finite Element Modelling of the Effect of Stiffness and Damping of Vocal Fold Layers on their Vibrations and Produced Sound
[nazev_orig] => Finite Element Modelling of the Effect of Stiffness and Damping of Vocal Fold Layers on their Vibrations and Produced Sound
[duvernost_udaju_id] => S
[popis] => The study presents a two-dimensional (2D) finite element (FE) model of the fluid-structure-acoustic interaction during self-sustained oscillation of the human vocal folds (VF). The FE model combines the FE models of the VF, trachea and a simplified human vocal tract shaped for phonation of a Czech vowel [a:]. The developed FE model comprises large deformations of the VF tissue, VF contact, fluid-structure interaction (FSI), morphing of the fluid mesh according to the VF motion (Arbitrary Lagrangian-Eulerian approach), solution of unsteady viscous compressible airflow described by the Navier-Stokes equations and airflow separation during the glottis closure. The effect of stiffness and damping of lamina propria, which can be caused by certain VF pathologies, on VF vibrations and produced sound are analyzed. The numerical simulations showed that stiffer lamina propria results in a decrease of the maximum width of glottal opening and in a decrease of the fundamental vibration frequency. Stiffer lamina propria also leads to an increase of maximum of the subglottal pressure and it causes amplitude decrease and flattening of the first and second formant in the spectrum of acoustic pressures. Higher values of lamina propria damping result in the amplitude decrease and flattening of all formants.
[popis_orig] => The study presents a two-dimensional (2D) finite element (FE) model of the fluid-structure-acoustic interaction during self-sustained oscillation of the human vocal folds (VF). The FE model combines the FE models of the VF, trachea and a simplified human vocal tract shaped for phonation of a Czech vowel [a:]. The developed FE model comprises large deformations of the VF tissue, VF contact, fluid-structure interaction (FSI), morphing of the fluid mesh according to the VF motion (Arbitrary Lagrangian-Eulerian approach), solution of unsteady viscous compressible airflow described by the Navier-Stokes equations and airflow separation during the glottis closure. The effect of stiffness and damping of lamina propria, which can be caused by certain VF pathologies, on VF vibrations and produced sound are analyzed. The numerical simulations showed that stiffer lamina propria results in a decrease of the maximum width of glottal opening and in a decrease of the fundamental vibration frequency. Stiffer lamina propria also leads to an increase of maximum of the subglottal pressure and it causes amplitude decrease and flattening of the first and second formant in the spectrum of acoustic pressures. Higher values of lamina propria damping result in the amplitude decrease and flattening of all formants.
[klicova_slova] => Biomechanics of voice; Simulation of phonation; Fluid-structure-acoustic interaction; Finite element method
[klicova_slova_orig] => Biomechanics of voice; Simulation of phonation; Fluid-structure-acoustic interaction; Finite element method
[url] => http://www.scientific.net/AMM.821.657
[oecd_obor_id] => 10307
[odpovedny_utvar_id] => 157
[odpovedny_utvar_nazev] => Institute of Solid Mechanics, Mechatronics and Biomechanics
[odpovedny_utvar_zkratka] => ISMMB
[nadrazena_soucast_id] => 4
[nadrazena_soucast_zkratka] => FME
[nadrazena_soucast_nazev] => Faculty of Mechanical Engineering
[originalni_jazyk] => en
[schvalil_id] => 999999
[schvaleno] => 2019-08-19
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[vykazovat_riv_zmeny] => 1
[slozka_id] =>
[posledni_diagnostika] =>
[vycet_osob] => HÁJEK, P.; ŠVANCARA, P.; HORÁČEK, J.; ŠVEC, J. G.
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[kod_doi] => 10.4028/www.scientific.net/AMM.821.657
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[znamka] =>
[kategorie_nazev] => Publication results
[druh_nazev] => Peer-reviewed article not indexed in WoS or Scopus
[druh_popis] => Other original article or review in a peer-reviewed scientific periodical not included in WoS or Scopus
[stav] => Approved
[vysledek_kategorie_id] => PV
[vysledek_system_kategorie_id] => PU
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[vlozil] => Informační systém Automat
[upravil] => Informační systém Automat
[ins_uid] => 999999
[upd_uid] => 999999
[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[identifikator] => ISBN 978-3-03835-700-1 ISSN 1662-7482
[identifikator_popis] => ISBN - Engineering Mechanics 2015 ISSN - Applied Mechanics and Materials (CH)
[riv_dodavka_id] => 1530
[riv_dodavka_oznaceni] => RIV18-TA0-26510___
[riv_dodavka_rok] => 2017
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[citace_text] => HÁJEK, P.; ŠVANCARA, P.; HORÁČEK, J.; ŠVEC, J. G. Finite Element Modelling of the Effect of Stiffness and Damping of Vocal Fold Layers on their Vibrations and Produced Sound. Applied Mechanics and Materials, 2016, no. 821, p. 657-664. ISSN: 1662-7482.
[citace_html] => HÁJEK, P.; ŠVANCARA, P.; HORÁČEK, J.; ŠVEC, J. G. Finite Element Modelling of the Effect of Stiffness and Damping of Vocal Fold Layers on their Vibrations and Produced Sound. Applied Mechanics and Materials, 2016, no. 821, p. 657-664. ISSN: 1662-7482.
[citace_rtf] =>
[citace_bibtex] => @article{BUT119426,
author="Petr {Hájek} and Pavel {Švancara} and Jaromír {Horáček} and Jan G. {Švec}",
title="Finite Element Modelling of the Effect of Stiffness and Damping of Vocal Fold Layers on their Vibrations and Produced Sound",
journal="Applied Mechanics and Materials",
year="2016",
number="821",
pages="657--664",
doi="10.4028/www.scientific.net/AMM.821.657",
issn="1662-7482",
url="http://www.scientific.net/AMM.821.657"
}
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[poznamka_metriky] =>
[nazev_en] => Finite Element Modelling of the Effect of Stiffness and Damping of Vocal Fold Layers on their Vibrations and Produced Sound
[popis_en] => The study presents a two-dimensional (2D) finite element (FE) model of the fluid-structure-acoustic interaction during self-sustained oscillation of the human vocal folds (VF). The FE model combines the FE models of the VF, trachea and a simplified human vocal tract shaped for phonation of a Czech vowel [a:]. The developed FE model comprises large deformations of the VF tissue, VF contact, fluid-structure interaction (FSI), morphing of the fluid mesh according to the VF motion (Arbitrary Lagrangian-Eulerian approach), solution of unsteady viscous compressible airflow described by the Navier-Stokes equations and airflow separation during the glottis closure. The effect of stiffness and damping of lamina propria, which can be caused by certain VF pathologies, on VF vibrations and produced sound are analyzed. The numerical simulations showed that stiffer lamina propria results in a decrease of the maximum width of glottal opening and in a decrease of the fundamental vibration frequency. Stiffer lamina propria also leads to an increase of maximum of the subglottal pressure and it causes amplitude decrease and flattening of the first and second formant in the spectrum of acoustic pressures. Higher values of lamina propria damping result in the amplitude decrease and flattening of all formants.
[klicova_slova_en] => Biomechanics of voice; Simulation of phonation; Fluid-structure-acoustic interaction; Finite element method
[vysledek_datum] => 2016-01-01T00:00:00+01:00
)
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(
[vysledek_id] => 119616
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[nazev] => On the Segregation Behavior of Tin and Antimony at Grain Boundaries of Polycrystalline bcc Iron
[nazev_orig] => On the Segregation Behavior of Tin and Antimony at Grain Boundaries of Polycrystalline bcc Iron
[duvernost_udaju_id] => S
[popis] => The study of the temperature dependence of tin and antimony segregation at grain boundaries of binary Fe–Sb and Fe–Sn polycrystalline alloys using Auger Electron Spectroscopy suggests that during the brittle intergranular fracture mainly the general grain boundaries are opened in the samples annealed at low temperatures which are more segregated than the special ones. On the contrary, the special grain boundaries are opened in the samples annealed at higher temperatures because – as a consequence of the enthalpy-entropy compensation effect – they are more enriched by the solute. The limiting temperature between these two states is the so-called compensation temperature. Therefore, the temperature dependence of the grain boundary segregation measured in polycrystals should be described by two sets of the thermodynamic parameters (i.e. segregation enthalpy and entropy): one of them correlating the segregation under the compensation temperature, the other
one for the segregation at higher temperatures.
[popis_orig] => The study of the temperature dependence of tin and antimony segregation at grain boundaries of binary Fe–Sb and Fe–Sn polycrystalline alloys using Auger Electron Spectroscopy suggests that during the brittle intergranular fracture mainly the general grain boundaries are opened in the samples annealed at low temperatures which are more segregated than the special ones. On the contrary, the special grain boundaries are opened in the samples annealed at higher temperatures because – as a consequence of the enthalpy-entropy compensation effect – they are more enriched by the solute. The limiting temperature between these two states is the so-called compensation temperature. Therefore, the temperature dependence of the grain boundary segregation measured in polycrystals should be described by two sets of the thermodynamic parameters (i.e. segregation enthalpy and entropy): one of them correlating the segregation under the compensation temperature, the other
one for the segregation at higher temperatures.
[klicova_slova] => Grain boundary segregation; Tin; Antimony; Fe based alloy; AES quantification
[klicova_slova_orig] => Grain boundary segregation; Tin; Antimony; Fe based alloy; AES quantification
[url] =>
[oecd_obor_id] => 10403
[odpovedny_utvar_id] => 153
[odpovedny_utvar_nazev] => Institute of Physical Engineering
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[nadrazena_soucast_nazev] => Faculty of Mechanical Engineering
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[vycet_osob] => LEJČEK, P.; ŠANDERA, P.; HORNÍKOVÁ, J.; POKLUDA, J.; GODEC, M.
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[upravil] => Informační systém Automat
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[upd_uid] => 999999
[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[identifikator] => ISSN 0169-4332
[identifikator_popis] => ISSN - APPLIED SURFACE SCIENCE (NL)
[riv_dodavka_id] => 1513
[riv_dodavka_oznaceni] => RIV18-TA0-26510___
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[citace_text] => LEJČEK, P.; ŠANDERA, P.; HORNÍKOVÁ, J.; POKLUDA, J.; GODEC, M. On the Segregation Behavior of Tin and Antimony at Grain Boundaries of Polycrystalline bcc Iron. APPLIED SURFACE SCIENCE, 2016, vol. 363, no. 1, p. 140-144. ISSN: 0169-4332.
[citace_html] => LEJČEK, P.; ŠANDERA, P.; HORNÍKOVÁ, J.; POKLUDA, J.; GODEC, M. On the Segregation Behavior of Tin and Antimony at Grain Boundaries of Polycrystalline bcc Iron. APPLIED SURFACE SCIENCE, 2016, vol. 363, no. 1, p. 140-144. ISSN: 0169-4332.
[citace_rtf] =>
[citace_bibtex] => @article{BUT119616,
author="Pavel {Lejček} and Pavel {Šandera} and Jana {Horníková} and Jaroslav {Pokluda} and Matjaž {Godec}",
title="On the Segregation Behavior of Tin and Antimony at Grain Boundaries of Polycrystalline bcc Iron",
journal="APPLIED SURFACE SCIENCE",
year="2016",
volume="363",
number="1",
pages="140--144",
doi="10.1016/j.apsusc.2015.12.020",
issn="0169-4332"
}
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[nazev_en] => On the Segregation Behavior of Tin and Antimony at Grain Boundaries of Polycrystalline bcc Iron
[popis_en] => The study of the temperature dependence of tin and antimony segregation at grain boundaries of binary Fe–Sb and Fe–Sn polycrystalline alloys using Auger Electron Spectroscopy suggests that during the brittle intergranular fracture mainly the general grain boundaries are opened in the samples annealed at low temperatures which are more segregated than the special ones. On the contrary, the special grain boundaries are opened in the samples annealed at higher temperatures because – as a consequence of the enthalpy-entropy compensation effect – they are more enriched by the solute. The limiting temperature between these two states is the so-called compensation temperature. Therefore, the temperature dependence of the grain boundary segregation measured in polycrystals should be described by two sets of the thermodynamic parameters (i.e. segregation enthalpy and entropy): one of them correlating the segregation under the compensation temperature, the other
one for the segregation at higher temperatures.
[klicova_slova_en] => Grain boundary segregation; Tin; Antimony; Fe based alloy; AES quantification
[vysledek_datum] => 2016-02-15T00:00:00+01:00
)
[8] => Array
(
[vysledek_id] => 119617
[vysledek_druh_id] => CONPA
[ex_vysledek_id] => 116811
[vysledek_rok] => 2016
[nazev] => Numerical Fracture Analysis of Compact Tension Shear (CTS) Specimens with Tortuous Crack Fronts
[nazev_orig] => Numerical Fracture Analysis of Compact Tension Shear (CTS) Specimens with Tortuous Crack Fronts
[duvernost_udaju_id] => S
[popis] => The aim of the contribution is to assess the influence of the microstructure of materials on the effective values of stress intensity factors. In this paper some results of 3D-finite element analyses of a CTS-specimen with a tortuous crack are presented. The specimen is subject to an in-plane shear remote loading (mode II) and tortuous crack flanks simulate rough cracks in polycrystalline materials. Finite element calculation by using the commercially available FE-code ANSYS has been carried out to determine stress/strain distribution in the vicinity of crack front and the local values of stress intensity factors are evaluated along the crack front. The existence of friction forces generated by sliding of crack wake asperities is included into calculations. Respective effective values are determined in dependence of the roughness of crack flanks. Results achieved allows to characterize the influence of microstructure to crack growth.
[popis_orig] => The aim of the contribution is to assess the influence of the microstructure of materials on the effective values of stress intensity factors. In this paper some results of 3D-finite element analyses of a CTS-specimen with a tortuous crack are presented. The specimen is subject to an in-plane shear remote loading (mode II) and tortuous crack flanks simulate rough cracks in polycrystalline materials. Finite element calculation by using the commercially available FE-code ANSYS has been carried out to determine stress/strain distribution in the vicinity of crack front and the local values of stress intensity factors are evaluated along the crack front. The existence of friction forces generated by sliding of crack wake asperities is included into calculations. Respective effective values are determined in dependence of the roughness of crack flanks. Results achieved allows to characterize the influence of microstructure to crack growth.
[klicova_slova] => shear mode, stress intensity factor, roughness, iron
[klicova_slova_orig] => shear mode, stress intensity factor, roughness, iron
[url] =>
[oecd_obor_id] => 20306
[odpovedny_utvar_id] => 153
[odpovedny_utvar_nazev] => Institute of Physical Engineering
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[nadrazena_soucast_zkratka] => FME
[nadrazena_soucast_nazev] => Faculty of Mechanical Engineering
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[schvaleno] => 2019-08-07
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[vycet_osob] => HORNÍKOVÁ, J.; ŽÁK, S.; ŠANDERA, P.
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[kod_doi] => 10.4028/www.scientific.net/KEM.665.77
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[upd_ts] => 2025-09-22
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[identifikator] => ISBN 978-3-03835-541-0 ISSN 1013-9826
[identifikator_popis] => ISBN - Advances in Fracture and Damage Mechanics ISSN - Key Engineering Materials (print) (CH)
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[citace_text] => HORNÍKOVÁ, J.; ŽÁK, S.; ŠANDERA, P. Numerical Fracture Analysis of Compact Tension Shear (CTS) Specimens with Tortuous Crack Fronts. In Advances in Fracture and Damage Mechanics. Key Engineering Materials (print). Key Engineering MAterials. Trans Tech Publications, 2016. no. 1, p. 77-80. ISBN: 978-3-03835-541-0. ISSN: 1013-9826.
[citace_html] => HORNÍKOVÁ, J.; ŽÁK, S.; ŠANDERA, P. Numerical Fracture Analysis of Compact Tension Shear (CTS) Specimens with Tortuous Crack Fronts. In Advances in Fracture and Damage Mechanics. Key Engineering Materials (print). Key Engineering MAterials. Trans Tech Publications, 2016. no. 1, p. 77-80. ISBN: 978-3-03835-541-0. ISSN: 1013-9826.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT119617,
author="Jana {Horníková} and Stanislav {Žák} and Pavel {Šandera}",
title="Numerical Fracture Analysis of Compact Tension Shear (CTS) Specimens with Tortuous Crack Fronts",
booktitle="Advances in Fracture and Damage Mechanics",
year="2016",
series="Key Engineering MAterials",
journal="Key Engineering Materials (print)",
volume="665",
number="1",
pages="77--80",
publisher="Trans Tech Publications",
doi="10.4028/www.scientific.net/KEM.665.77",
isbn="978-3-03835-541-0",
issn="1013-9826"
}
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[poznamka_metriky] =>
[nazev_en] => Numerical Fracture Analysis of Compact Tension Shear (CTS) Specimens with Tortuous Crack Fronts
[popis_en] => The aim of the contribution is to assess the influence of the microstructure of materials on the effective values of stress intensity factors. In this paper some results of 3D-finite element analyses of a CTS-specimen with a tortuous crack are presented. The specimen is subject to an in-plane shear remote loading (mode II) and tortuous crack flanks simulate rough cracks in polycrystalline materials. Finite element calculation by using the commercially available FE-code ANSYS has been carried out to determine stress/strain distribution in the vicinity of crack front and the local values of stress intensity factors are evaluated along the crack front. The existence of friction forces generated by sliding of crack wake asperities is included into calculations. Respective effective values are determined in dependence of the roughness of crack flanks. Results achieved allows to characterize the influence of microstructure to crack growth.
[klicova_slova_en] => shear mode, stress intensity factor, roughness, iron
[vysledek_datum] => 2016-03-01T00:00:00+01:00
)
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[nazev] => Shock Absorber
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[popis] => Metal part inserted between valve and plastic guard to absorb some impact energy of the pressure bottle and to avoid damage of the valve.
[popis_orig] => Metal part inserted between valve and plastic guard to absorb some impact energy of the pressure bottle and to avoid damage of the valve.
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[url] =>
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[citace_text] => SLAŽANSKÝ, M.; BURŠA, J.; FEDOROVA, S.: Shock Absorber. (Prototyp)
[citace_html] => SLAŽANSKÝ, M.; BURŠA, J.; FEDOROVA, S.: Shock Absorber. (Prototyp)
[citace_rtf] =>
[citace_bibtex] => @misc{BUT119716,
author="Martin {Slažanský} and Jiří {Burša} and Svitlana {Fedorova}",
title="Shock Absorber",
year="2015",
note="Prototype"
}
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[nazev_en] => Shock Absorber
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(
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[nazev_orig] => SHAPE DEVIATIONS ANALYSIS OF THE ALIGNED BARS
[duvernost_udaju_id] => S
[popis] => This paper analyzes shape deviations of the bar surface, which was straightened in the straightening machine. Computational modelling of the straightening process is solved numerically using the finite element method. The outer diameter of the bar is 20 mm and its length is 6 m. The original curvature of the bar had a curvature radius R = 180 m. The shape deviations were analysed using the algorithm that was developed within the framework of the stress state analysis performed in ceramic heads of total hip replacement.
[popis_orig] => This paper analyzes shape deviations of the bar surface, which was straightened in the straightening machine. Computational modelling of the straightening process is solved numerically using the finite element method. The outer diameter of the bar is 20 mm and its length is 6 m. The original curvature of the bar had a curvature radius R = 180 m. The shape deviations were analysed using the algorithm that was developed within the framework of the stress state analysis performed in ceramic heads of total hip replacement.
[klicova_slova] => Oblique straightening machine, finite element method, shape deviations
[klicova_slova_orig] => Oblique straightening machine, finite element method, shape deviations
[url] =>
[oecd_obor_id] => 20301
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[identifikator] => ISBN 978-80-214-4871-1 ISSN 1805-8248
[identifikator_popis] => ISBN - Engineering Mechanics 2014 ISSN - Engineering Mechanics (CZ)
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[citace_text] => FUIS, V. SHAPE DEVIATIONS ANALYSIS OF THE ALIGNED BARS. In Engineering Mechanics 2014. Engineering Mechanics. Svratka: VUT, 2014. p. 184-187. ISBN: 978-80-214-4871-1. ISSN: 1805-8248.
[citace_html] => FUIS, V. SHAPE DEVIATIONS ANALYSIS OF THE ALIGNED BARS. In Engineering Mechanics 2014. Engineering Mechanics. Svratka: VUT, 2014. p. 184-187. ISBN: 978-80-214-4871-1. ISSN: 1805-8248.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT120479,
author="Vladimír {Fuis}",
title="SHAPE DEVIATIONS ANALYSIS OF THE ALIGNED BARS",
booktitle="Engineering Mechanics 2014",
year="2014",
journal="Engineering Mechanics",
pages="184--187",
publisher="VUT",
address="Svratka",
isbn="978-80-214-4871-1",
issn="1805-8248"
}
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[poznamka_metriky] =>
[nazev_en] => SHAPE DEVIATIONS ANALYSIS OF THE ALIGNED BARS
[popis_en] => This paper analyzes shape deviations of the bar surface, which was straightened in the straightening machine. Computational modelling of the straightening process is solved numerically using the finite element method. The outer diameter of the bar is 20 mm and its length is 6 m. The original curvature of the bar had a curvature radius R = 180 m. The shape deviations were analysed using the algorithm that was developed within the framework of the stress state analysis performed in ceramic heads of total hip replacement.
[klicova_slova_en] => Oblique straightening machine, finite element method, shape deviations
[vysledek_datum] => 2014-05-12T00:00:00+02:00
)
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(
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[duvernost_udaju_id] => S
[popis] => Engineering Mechanics 2014 - the objective of the 20-th conference is to provide a forum for researchers to discuss the state-of-the-art in Mechanics of Solids, Fluids and Thermomechanics, this particularly in connection with problems under investigation in the Czech Republic. Problems of Engineering Mechanics related to the contemplated topics can be discussed, and their solutions presented, during the sessions of the Conference, held at the Hotel of the ŽDAS, a.s..
[popis_orig] => Engineering Mechanics 2014 - the objective of the 20-th conference is to provide a forum for researchers to discuss the state-of-the-art in Mechanics of Solids, Fluids and Thermomechanics, this particularly in connection with problems under investigation in the Czech Republic. Problems of Engineering Mechanics related to the contemplated topics can be discussed, and their solutions presented, during the sessions of the Conference, held at the Hotel of the ŽDAS, a.s..
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[url] =>
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[identifikator] => ISBN 978-80-214-4871-1
[identifikator_popis] => ISBN - Engineering Mechanics 2014
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[citace_text] => FUIS, V. Engineering Mechanics 2014. Engineering Mechanics 2014. ISSN 1805-8248. Svratka: VUT, 2014. p. 1-762. ISBN: 978-80-214-4871-1.
[citace_html] => FUIS, V. Engineering Mechanics 2014. Engineering Mechanics 2014. ISSN 1805-8248. Svratka: VUT, 2014. p. 1-762. ISBN: 978-80-214-4871-1.
[citace_rtf] =>
[citace_bibtex] => @proceedings{BUT120508,
editor="Vladimír {Fuis}",
title="Engineering Mechanics 2014",
year="2014",
series="ISSN 1805-8248",
number="20",
pages="1--762",
publisher="VUT",
address="Svratka",
isbn="978-80-214-4871-1"
}
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[oecd_tree_podobor_id] => 20301
[oecd_tree_podobor_nazev] => Mechanical engineering
[poznamka_metriky] =>
[nazev_en] => Engineering Mechanics 2014
[popis_en] => Engineering Mechanics 2014 - the objective of the 20-th conference is to provide a forum for researchers to discuss the state-of-the-art in Mechanics of Solids, Fluids and Thermomechanics, this particularly in connection with problems under investigation in the Czech Republic. Problems of Engineering Mechanics related to the contemplated topics can be discussed, and their solutions presented, during the sessions of the Conference, held at the Hotel of the ŽDAS, a.s..
[klicova_slova_en] => Engineering Mechanics
[vysledek_datum] => 2014-05-12T00:00:00+02:00
)
[12] => Array
(
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[vysledek_druh_id] => ABSTR
[ex_vysledek_id] => 117895
[vysledek_rok] => 2015
[nazev] => Comparing the Use of Compressible and Incompressible Flow in the FE Mode lof Human Vocal Folds Self-oscillation
[nazev_orig] => Comparing the Use of Compressible and Incompressible Flow in the FE Mode lof Human Vocal Folds Self-oscillation
[duvernost_udaju_id] => S
[popis] => In this study a three-dimensional (3D) finite element (FE) model of the flow-induced self-oscillation of the human vocal folds in interaction with air in a simplified vocal tract model is presented. The 3D vocal tract model of the acoustic spaces for Czech vowel [a:] was created by converting the data from the magnetic resonance images (MRI). The developed FE model includes fluid-structure interaction, morphing the fluid mesh according to the vocal-fold motion, unsteady viscous compressible/incompressible airflow described by the Navier-Stokes equations, airflow separation during the glottis closure, large deformations of the vocal-fold tissue and vocal-fold contact. The aim of this work is to analyze the effect of compressible and incompressible flow model on produced air pressure fluctuations and on vibrations of the vocal folds using the identical FE mesh and boundary conditions.
[popis_orig] => In this study a three-dimensional (3D) finite element (FE) model of the flow-induced self-oscillation of the human vocal folds in interaction with air in a simplified vocal tract model is presented. The 3D vocal tract model of the acoustic spaces for Czech vowel [a:] was created by converting the data from the magnetic resonance images (MRI). The developed FE model includes fluid-structure interaction, morphing the fluid mesh according to the vocal-fold motion, unsteady viscous compressible/incompressible airflow described by the Navier-Stokes equations, airflow separation during the glottis closure, large deformations of the vocal-fold tissue and vocal-fold contact. The aim of this work is to analyze the effect of compressible and incompressible flow model on produced air pressure fluctuations and on vibrations of the vocal folds using the identical FE mesh and boundary conditions.
[klicova_slova] => Biomechanics of voice, Fluid-structure-acoustic interaction, Finite element method, Navier-Stokes equations
[klicova_slova_orig] => Biomechanics of voice, Fluid-structure-acoustic interaction, Finite element method, Navier-Stokes equations
[url] =>
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[citace_text] => ŠVANCARA, P.; HORÁČEK, J.; HÁJEK, P.; MATUG, M.; ŠVEC, J.G. Comparing the Use of Compressible and Incompressible Flow in the FE Mode lof Human Vocal Folds Self-oscillation. Engineering mechanics 2015. Svratka: Institute of Theoretical and Applied Mechanics ASCR, 2015. p. 306-307. ISBN: 978-80-86246-42-0.
[citace_html] => ŠVANCARA, P.; HORÁČEK, J.; HÁJEK, P.; MATUG, M.; ŠVEC, J.G. Comparing the Use of Compressible and Incompressible Flow in the FE Mode lof Human Vocal Folds Self-oscillation. Engineering mechanics 2015. Svratka: Institute of Theoretical and Applied Mechanics ASCR, 2015. p. 306-307. ISBN: 978-80-86246-42-0.
[citace_rtf] =>
[citace_bibtex] => @misc{BUT121911,
author="Pavel {Švancara} and Jaromír {Horáček} and Petr {Hájek} and Michal {Matug} and Jan G. {Švec}",
title="Comparing the Use of Compressible and Incompressible Flow in the FE Mode lof Human Vocal Folds Self-oscillation",
booktitle="Engineering mechanics 2015",
year="2015",
pages="306--307",
publisher="Institute of Theoretical and Applied Mechanics ASCR",
address="Svratka",
isbn="978-80-86246-42-0",
note="Abstract"
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[nazev_en] => Comparing the Use of Compressible and Incompressible Flow in the FE Mode lof Human Vocal Folds Self-oscillation
[popis_en] => In this study a three-dimensional (3D) finite element (FE) model of the flow-induced self-oscillation of the human vocal folds in interaction with air in a simplified vocal tract model is presented. The 3D vocal tract model of the acoustic spaces for Czech vowel [a:] was created by converting the data from the magnetic resonance images (MRI). The developed FE model includes fluid-structure interaction, morphing the fluid mesh according to the vocal-fold motion, unsteady viscous compressible/incompressible airflow described by the Navier-Stokes equations, airflow separation during the glottis closure, large deformations of the vocal-fold tissue and vocal-fold contact. The aim of this work is to analyze the effect of compressible and incompressible flow model on produced air pressure fluctuations and on vibrations of the vocal folds using the identical FE mesh and boundary conditions.
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[popis] => Polymer pipe lifetime is conventionally estimated by internal pressure test. However, important for service are also other types of loading as: additional bending, different type of external loading from sand embedding, or effect of the residual stresses. One of the dangerous type of loading is so-called “point load” caused, for example, by stones in the soil. The present article is focused on the numerical prediction of this effect on the pipe lifetime. For the lifetime estimation of a polymer pipe under point loading, an approach based on combination of numerical calculation and experimental measurements was used. A special numerical algorithm, which optimizes modeled crack front shape according to the real one during simulation of crack propagation, was proposed. Finally, an analytical relationship for the estimation of fracture parameters of propagating crack across the pipe wall crucial for the pipe lifetime estimation is presented in the paper. A significant reduction of the residual lifetime was found for the cracked pipe loaded by additional point load (consideration of indentation effects of stones in the soil) in comparison with pipe loaded by internal pressure only. The approach presented contributes to the safer service of polyolefin pipes.
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[klicova_slova_orig] => lifetime estimation, residual stresses, polyolefin pipe, FEM, crack propagation
[url] => http://onlinelibrary.wiley.com/doi/10.1002/pen.24194/abstract
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[citace_rtf] =>
[citace_bibtex] => @article{BUT121963,
author="Zdeněk {Majer} and Pavel {Hutař} and Andreas {Frank} and Martin {Ševčík} and Michal {Zouhar} and Gerald {Pinter} and Luboš {Náhlík}",
title="Point load effect on the buried polyolefin pipes lifetime",
journal="POLYMER ENGINEERING AND SCIENCE",
year="2016",
volume="56",
number="1",
pages="79--86",
doi="10.1002/pen.24194",
issn="0032-3888",
url="http://onlinelibrary.wiley.com/doi/10.1002/pen.24194/abstract"
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[id_vav] => 119617
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[9] => Array
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[quotations] => SLAŽANSKÝ, M.; BURŠA, J.; FEDOROVA, S.
[title] => Shock Absorber
[typ] => AV
[year] => 2015
[id_vav] => 119716
)
[10] => Array
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[quotations] => FUIS, V.
[title] => SHAPE DEVIATIONS ANALYSIS OF THE ALIGNED BARS
[typ] => PV
[year] => 2014
[id_vav] => 120479
)
[11] => Array
(
[quotations] => FUIS, V.
[title] => Engineering Mechanics 2014
[typ] => PV
[year] => 2014
[id_vav] => 120508
)
[12] => Array
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[quotations] => ŠVANCARA, P.; HORÁČEK, J.; HÁJEK, P.; MATUG, M.; ŠVEC, J.G.
[title] => Comparing the Use of Compressible and Incompressible Flow in the FE Mode lof Human Vocal Folds Self-oscillation
[typ] => PV
[year] => 2015
[id_vav] => 121911
)
[13] => Array
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[quotations] => MAJER, Z.; HUTAŘ, P.; FRANK, A.; ŠEVČÍK, M.; ZOUHAR, M.; PINTER, G.; NÁHLÍK, L.
[title] => Point load effect on the buried polyolefin pipes lifetime
[typ] => PV
[year] => 2016
[id_vav] => 121963
)
[14] => Array
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[quotations] => GREPL, R.; PALOUŠEK, D.; KREJČÍ, P.; VEJLUPEK, J.; MISTRÍK, M.
[title] => Biologický inkubátor pro uchovávání a přepravu biologických vzorků, zejména buněčných kultur
[typ] => AV
[year] => 2015
[id_vav] => 122564
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)