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根据纤维增强复合材料宏细观结构,基于纤维的线弹性假设和基体的粘弹性假设,推导了单向复合材料粘弹性损伤本构关系。在此基础上,结合Hashin失效准则进行单层板面内损伤识别,通过界面单元模拟层间分层损伤,采用非线性有限元方法,建立了复合材料层板高速冲击损伤有限元分析模型。利用该模型,深入研究了不同形状弹体高速冲击下复合材料层板的弹道性能和损伤特性,探讨了相关参数对冲击损伤的影响规律,获得了一些有价值的结论。
According to the macroscopic microstructure of fiber reinforced composites, the viscoelastic damage constitutive relation of unidirectional composite was deduced based on the assumption of fiber linear elasticity and the viscoelasticity of matrix. Based on this, the damage criterion of single-layer slab is identified by Hashin failure criteria. The interface layer is used to simulate the delamination damage between layers. The nonlinear finite element method is used to establish the finite element model of high-speed impact damage of the composite laminates. Using this model, the ballistic performance and damage characteristics of composite laminates with different shapes of projectile subjected to high velocity impact are studied in depth. The influence of relevant parameters on impact damage is discussed and some valuable conclusions are obtained.