ABSTRACT This paper develops a numerical model that contained random lip-shaped matrix cracks based on the maximum energy release rate criterion for the prediction of failure progress of Continuous Fibre-reinforced Ceramic Matrix Composites (CFCC) under transverse tension. Fibre distribution layout is created based on the actual microstructure and the Random Sequential Adsorption algorithm is used to generate the distribution of lip-shaped matrix cracks. The influence of the lip-shaped matrix crack distribution and crack density on the failure progress and stress–strain response was investigated. It was found that the onset of damage initiation commenced from the lip-shaped matrix crack when the interface fracture energy was smaller than the critical interface fracture energy. The failure progress and the predicted results were in good agreement with the experimental results. The different matrix cracks distribution affected the failure progress. Finally, the tensile strength and the elastic modulus both decreased with the crack density increasing.

中文翻译：

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连续纤维增强陶瓷基复合材料中唇状基体裂纹分布对横向拉伸破坏进程的影响

摘要 本文基于最大能量释放率准则开发了一个包含随机唇形基体裂纹的数值模型，用于预测横向拉伸下连续纤维增强陶瓷基复合材料 (CFCC) 的失效进程。根据实际微观结构创建纤维分布布局，并使用随机顺序吸附算法生成唇形基体裂纹的分布。研究了唇形基体裂纹分布和裂纹密度对失效进程和应力应变响应的影响。结果表明，当界面断裂能小于临界界面断裂能时，损伤开始从唇形基体裂纹开始。失效进程和预测结果与实验结果吻合良好。不同的基体裂纹分布影响了失效进程。最后，随着裂纹密度的增加，拉伸强度和弹性模量均下降。