ABSTRACT

The constitutive response of ceramics matrix composites (CMCs) under arbitrary loading and loading was studied. A method for determining the distribution of slip regions under arbitrary loading was proposed based on the shear lag model and slip law. Furthermore, a method for judging the closure of the matrix cracks was given based on the assumption that the fibre strain consists of the elastic strain and the pseudo-plastic strain of CMCsss. The stress–strain response of CMCs was obtained in form of matrices based on the distribution of the slip regions instead of the integration of fibre stress in each slip region. The simulated results show that the proposed method improves the computing efficiency greatly compared with previous approaches. Additionally, the simulated results agree well with experimental data, proving that the method proposed in this paper is credible.

摘要

研究了陶瓷基复合材料（CMCs）在任意载荷下的本构响应。提出了一种基于剪力滞模型和滑移定律的任意荷载作用下滑移区域分布的确定方法。此外，基于纤维应变由CMCsss的弹性应变和假塑性应变组成的假设，给出了一种判断基体裂纹闭合的方法。基于滑移区域的分布而不是每个滑移区域中纤维应力的积分，以矩阵形式获得了CMC的应力-应变响应。仿真结果表明，与现有方法相比，该方法大大提高了计算效率。此外，模拟结果与实验数据非常吻合，