Abstract
For ductile materials with cracks, when the stress at crack tip exceeds the yield strength, a plastic zone will be formed around crack tip. In this paper, the extended finite element method(XFEM) in ABAQUS was used to simulate the crack, and the mechanical behaviors of crack tip plastic zone under different constitutive models were studied by taking the three-point bending specimen as the research object. The COD experiment and theoretical verification of three-point bending demonstrate the effectiveness of this method. The effect of the plastic modulus on size of crack tip plastic zone under the double broken line constitutive model is analyzed, and the effects of the load on plastic zone size and stress distribution near crack tip under the true stress-strain constitutive model is discussed. Finally, the difference of stress distributions around crack tip obtained from two constitutive models is compared.
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