Crystal plasticity FEM study of material and mechanical effects on damage accumulation mode of fatigue crack propagation

•Occurrence condition of damage-accumulation mode fatigue crack propagation.•Indicators for mode transition are clarified using crystal plasticity FEM.•Strain localization is the most crucial indicator.•Grain size, Schmid factor, and plastic zone size determine strain localization.•Equation for occu...

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Bibliographic Details
Published in:International journal of fatigue 2023-08, Vol.173, p.107683, Article 107683
Main Authors: Chen, Bowen, Hamada, Shigeru, Li, Wanjia, Noguchi, Hiroshi
Format: Article
Language:English
Subjects:
Crystal plasticity FEM
Fatigue crack extension mode
Grain size
Micromechanics
Plastic normal strain localization
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Summary:•Occurrence condition of damage-accumulation mode fatigue crack propagation.•Indicators for mode transition are clarified using crystal plasticity FEM.•Strain localization is the most crucial indicator.•Grain size, Schmid factor, and plastic zone size determine strain localization.•Equation for occurrence condition is proposed to clarify mode transition. To quantify the material and mechanical effects on the damage accumulation (DA) mode of fatigue crack propagation (FCP), a crystal plasticity finite element method was used in a polycrystalline copper specimen. Thus, the plastic normal strain localization ahead of the notch root, which is correlated with DA-FCP, was analyzed. As a result, an equation of the critical grain size formulated by the Schmid factor, misorientation angle, and plastic zone size is proposed to characterize the critical occurrence condition for the DA-FCP. Moreover, a method for predicting the DA-FCP region size is proposed.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2023.107683