Abstract
In this paper, a methodology integrating crystal plasticity (CP), the eXtended finite element method (XFEM) and the cohesive zone model (CZM) is developed for an Al-Cu-Mg alloy to predict fatigue crack propagation (FCP) across grain boundary (GB) of Al-Cu-Mg alloy during stage ІІ. One GB model is incorporated into FCP constitutive law to describe grain interaction at GB. A bicrystal containing GB is built up to simulate FCP behavior through L participated GBs. Modelling features including GB characteristic, cumulative plastic strain (CPS) distribution and crystal slipping evidence can be identified. The numerical results are compared with published experimental data to check the accuracy of model. This work demonstrates that the combination of CP containing GB constitutive laws, XFEM and CZM is a promising methodology in predicting twist angle-controlled crack deflection through GBs.
Published Version
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