复合材料层合板在低速冲击作用下的损伤分析

进行了复合材料层合板在低速冲击载荷作用下的损伤模拟数值分析。建立了实体单元与cohesive界面单元相结合的有限元分析模型。建立了面内和层间损伤逐渐累积的损伤模型,采用强度准则和适当的刚度退化方案表征基体与纤维的各种面内损伤形式。根据基于应变的失效准则和能量释放率准则来判断分层损伤的起始和扩展,以界面单元的失效表征分层扩展。实例计算结果和实验结果对比分析表明,本文所采用的模型、算法与损伤处理方法是合理的。

Low-velocity impact damage analysis in composite laminates

The numerical analysis was carried out for the low-velocity impact damages of composite laminates.The finite element model was generated using the 3D solid elements and interfacial cohesive elements.The successive damage models were established for the in-plane and interlaminar damages.The strength criterion and a stiffness degradation scheme were used to characterize various in-plane damage forms.Criterions based on element strain level and energy release rate respectively were applied with the cohesive el...