Plasticity and asperity-induced fatigue crack closure under mixed-mode loading

Abstract : Plasticity and asperity-induced crack closure under mixed-mode non-proportional loading are investigated, using numerical models. It is shown that the applied mode II can either increase or decrease the effective DKI, depending on the R ratio and loading path. In some cases, mode II is found to have opposite effects on each of the two closure mechanisms. These results are coherent with some crack-length or roughness-dependent variations in mode I fatigue crack growth rate due to the presence of a static mode II reported in the literature. For 90 out-of-phase mixed-mode loading, mode II is predicted to reduce drastically or even suppress plasticity-induced closure.
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https://hal.archives-ouvertes.fr/hal-00497694
Contributor : Véronique Doquet <>
Submitted on : Monday, July 5, 2010 - 4:44:11 PM
Last modification on : Friday, October 11, 2019 - 1:25:59 AM

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Véronique Doquet, Quang-Hien Bui, Andrei Constantinescu. Plasticity and asperity-induced fatigue crack closure under mixed-mode loading. International Journal of Fatigue, Elsevier, 2010, 32 (10), pp.1612-1619. ⟨10.1016/j.ijfatigue.2010.02.011⟩. ⟨hal-00497694⟩

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