Key Issues With Residual Fatigue Life Estimation In Steels, Highly Scattered And Non-Conservative Thresholds, Crack Closure Mechanisms, Influencing Factors, Relevant Material Properties

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F24%3APU155741" target="_blank" >RIV/00216305:26210/24:PU155741 - isvavai.cz</a>

Výsledek na webu

<a href="https://fatigue2024.com/abstract-book-conference-proceedings/" target="_blank" >https://fatigue2024.com/abstract-book-conference-proceedings/</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Key Issues With Residual Fatigue Life Estimation In Steels, Highly Scattered And Non-Conservative Thresholds, Crack Closure Mechanisms, Influencing Factors, Relevant Material Properties

Popis výsledku v původním jazyce

Fatigue crack growth rates for three different steels at room temperature were measured at high and low load ratios. The loading components and mechanisms in terms of effective ΔK, plasticity-, roughness- and oxide-induced crack closure were separated, including the threshold. The plasticity-induced crack closure values were modified according to the material cyclic plastic behaviour. The influencing factors on oxide debris growth such as loading history and air humidity are discussed. A model for simulation of oxide debris growth is introduced. The approach to fatigue crack growth modelling considering all these effects is presented, which contributes to a clarification of the influencing factors and to reaching the aim of transferability of the fatigue crack growth data into applications. It is pointed out that the lack of consideration of oxide-induced crack closure can lead to several non-conservative or misleading scenarios.

Název v anglickém jazyce

Key Issues With Residual Fatigue Life Estimation In Steels, Highly Scattered And Non-Conservative Thresholds, Crack Closure Mechanisms, Influencing Factors, Relevant Material Properties

Popis výsledku anglicky

Fatigue crack growth rates for three different steels at room temperature were measured at high and low load ratios. The loading components and mechanisms in terms of effective ΔK, plasticity-, roughness- and oxide-induced crack closure were separated, including the threshold. The plasticity-induced crack closure values were modified according to the material cyclic plastic behaviour. The influencing factors on oxide debris growth such as loading history and air humidity are discussed. A model for simulation of oxide debris growth is introduced. The approach to fatigue crack growth modelling considering all these effects is presented, which contributes to a clarification of the influencing factors and to reaching the aim of transferability of the fatigue crack growth data into applications. It is pointed out that the lack of consideration of oxide-induced crack closure can lead to several non-conservative or misleading scenarios.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20306 - Audio engineering, reliability analysis

Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2024

Kód důvěrnosti údajů

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