Probabilistic fatigue damage prediction of relative short edge crack using Direct Optimized Probabilistic Calculation

Kód výsledku v IS VaVaI

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Výsledek na webu

<a href="https://www.taylorfrancis.com/books/e/9781351174657/chapters/10.1201%2F9781351174664-280" target="_blank" >https://www.taylorfrancis.com/books/e/9781351174657/chapters/10.1201%2F9781351174664-280</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Probabilistic fatigue damage prediction of relative short edge crack using Direct Optimized Probabilistic Calculation

Popis výsledku v původním jazyce

Fatigue crack propagation depends on an amount and value of stress range cycles. This is a time factor in that governs the reliability for the entire designed service life. The failure rate increases during the aging and the reliability decreases. If possible propagation of the fatigue crack shall be included into the failure rate assessment. Thus, it is necessary to investigate the fatigue crack and define the maximum acceptable degradation. Three sizes are important for the characterization of the propagation of fatigue cracks - initial size, detectable size and acceptable size. The theoretical model of a fatigue crack progression can be based on a linear elastic fracture mechanics (using Paris-Erdogan law). Depending on location of an initial crack, the crack may propagate in structural element (e.g. from the edge or from the surface under various load) that could be described by calibration functions. Single edge-cracked steel element with rectangular cross-section under relative short edge fatigue damage under pure tension, pure bending, three and four point bending load have been chosen for applications of the theoretical solution suggested in the studies. When determining the required level of reliability, it is possible to specify the time of the first inspection of the construction which will focus on the fatigue damage. Using a conditional probability and Bayesian approach, times for subsequent inspections can be determined based on the results of the previous inspection. For probabilistic calculation of fatigue crack progression, the original and new probabilistic method - the Direct Optimized Probabilistic Calculation (&quot;DOProC&quot;), which uses a purely numerical approach without any simulation techniques or approximation approach based on optimized numerical integration, was used. This provides more accurate solutions to probabilistic tasks, and, in some cases, allows to considerably fasten completion of computations with the taking into account the statistical dependence of random input variables. A comparative example was processed using the FSCProbCalc code that applies the described computational procedure.

Název v anglickém jazyce

Probabilistic fatigue damage prediction of relative short edge crack using Direct Optimized Probabilistic Calculation

Popis výsledku anglicky

Fatigue crack propagation depends on an amount and value of stress range cycles. This is a time factor in that governs the reliability for the entire designed service life. The failure rate increases during the aging and the reliability decreases. If possible propagation of the fatigue crack shall be included into the failure rate assessment. Thus, it is necessary to investigate the fatigue crack and define the maximum acceptable degradation. Three sizes are important for the characterization of the propagation of fatigue cracks - initial size, detectable size and acceptable size. The theoretical model of a fatigue crack progression can be based on a linear elastic fracture mechanics (using Paris-Erdogan law). Depending on location of an initial crack, the crack may propagate in structural element (e.g. from the edge or from the surface under various load) that could be described by calibration functions. Single edge-cracked steel element with rectangular cross-section under relative short edge fatigue damage under pure tension, pure bending, three and four point bending load have been chosen for applications of the theoretical solution suggested in the studies. When determining the required level of reliability, it is possible to specify the time of the first inspection of the construction which will focus on the fatigue damage. Using a conditional probability and Bayesian approach, times for subsequent inspections can be determined based on the results of the previous inspection. For probabilistic calculation of fatigue crack progression, the original and new probabilistic method - the Direct Optimized Probabilistic Calculation (&quot;DOProC&quot;), which uses a purely numerical approach without any simulation techniques or approximation approach based on optimized numerical integration, was used. This provides more accurate solutions to probabilistic tasks, and, in some cases, allows to considerably fasten completion of computations with the taking into account the statistical dependence of random input variables. A comparative example was processed using the FSCProbCalc code that applies the described computational procedure.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20102 - Construction engineering, Municipal and structural engineering

Projekt

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Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Safety and Reliability - Safe Societies in a Changing World - Proceedings of the 28th International European Safety and Reliability Conference, ESREL 2018

ISBN

978-0-8153-8682-7

ISSN

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e-ISSN

neuvedeno

Počet stran výsledku

8

Strana od-do

2235-2242

Název nakladatele

CRC Press

Místo vydání

Leiden

Místo konání akce

Trondheim

Datum konání akce

17. 6. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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