针对高抗冲聚苯乙烯,本文建立了细观单胞结构三维模型,引入周期性边界条件,采用非线性有限元法,研究了在单向拉伸载荷下银纹化损伤过程。采用最大主应力准则作为银纹化损伤判据,通过受损单元积分点刚度矩阵的折减实现材料力学性能的退化,运用材料的应力-应变曲线预测了其力学性能。数值结果与相关文献模拟结果吻合,表明本文损伤预测三维模型的合理有效性。
By using a nonlinear finite element method,3D representative volume element（RVE） models under periodical boundary conditions were constructed to simulate the crazing process within uniaxially tensed high impact polystyrenes（HIPS）.Maximum principal stress criterion was introduced for the prediction of initial damage in material matrix,and the degradation of mechanical properties was approached by reducing the stiffness of damaged elements.The mechanical properties of the materials were then obtained from the calculated stress-strain curves.Our results show good agreements with the related literatures,which verify the effectiveness of our models.
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