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发展了一种基于物理机制的复合材料结构失效分析方法,方法包括建立基于物理机制的面内失效起始准则,和对应的连续型损伤演化方法,方法所需的材料参数都具有明确的物理意义,无需经验参数。对两种层合板的开孔拉伸试验进行了数值模拟,模拟结果表明基于物理机制的失效分析方法能很好的模拟层合板的失效起始和演化,预测结构的失效强度、失效过程及最终破坏模式与试验吻合较好。同时还发现,无论是纤维主导还是基体主导的破坏模式,层合板内都出现了不可忽视的大面积分层,在模拟失效时考虑分层十分必要。
A physical mechanism-based failure analysis method for composite structures is developed. The method includes the establishment of an in-plane failure criterion based on a physical mechanism and a corresponding continuous damage evolution method. The material parameters required by the method all have clear physical meaning , Without empirical parameters. The numerical simulation of open-hole tensile test of two laminates shows that the failure mechanism based on physical mechanism can well simulate the failure initiation and evolution of laminates, predict the failure strength, failure process and finally Failure mode is in good agreement with the test. At the same time, it is also found that both the fiber-dominated and the matrix-dominated modes of failure present a large area of stratification that can not be neglected in the laminate, and it is necessary to consider stratification in the simulation of failure.