CONCEPTUAL PROBLEMS WITH FATIGUE CRACK CLOSURE AND PLASTICITY: INFLUENCE OF CYCLIC SOFTENING

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F22%3APU145099" target="_blank" >RIV/00216305:26210/22:PU145099 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
CONCEPTUAL PROBLEMS WITH FATIGUE CRACK CLOSURE AND PLASTICITY: INFLUENCE OF CYCLIC SOFTENING
Original language description
Plasticity-induced crack closure (PICC) should be proportional to the amount of plastic deformation near the crack tip. This suggests that softer materials have larger PICC than harder materials, which is often a way of explanation of the observed crack growth rates at low R. However, experimental data showed that at high load ratio R = 0.8 (presumption of no crack closure), the crack growth rates were higher in a high-strength steel limited cyclic hardening), denoted as "hard steel", compared to a steel with pronounced cyclic softening (denoted "soft steel"). At low load ratio R = 0.1 in the Paris regime, it was the opposite: the "hard steel" exhibited slower crack propagation. This means that the crack closure effect was much larger in the harder material. Such behaviour cannot be explained based on classical ideas about crack closure.
Czech name
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Czech description
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Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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