复合材料层合板低速冲击后压缩的损伤累积模型

为了分析复合材料层合板低速冲击后的压缩性能，首先用三维动态有限元素法对两种层合板进行了低速冲击损伤模拟计算，以此作为冲击后压缩（CAI）层合板的初始损伤，然后用三维静态有限元对含损伤的层合板进行压缩破坏模拟和剩余强度计算，从而实现了层合板从冲击损伤到压缩破坏损伤全过程的模拟．结果表明，损伤投影面积和CAI强度的计算值与试验结果有较好的一致性．

Damage Progressive Model of Compression of Composite Laminates After Low Velocity Impact

Compressive properties of composite laminates after low velocity impact are one of the most serious circumstances that must be taken into account in damage tolerance design of composite structures. In order to investigate compressive properties of composite laminates after low velocity impact, three dimensional dynamic finite element method (FEM) was used to simulate low_velocity impact damage of 2 kinds of composite laminates firstly. Damage distributions and projective damage areas of the laminates were predicted under two impact energy levels. The analyzed damage after impact was considered to be the initial damage of the laminates under compressive loads. Then three dimensional static FEM was used to simulate the compressive failure process and to calculate residual compressive strengths of the impact damaged laminates. It is achieved to simulate the whole process from initial low_velocity impact damage to final compressive failure of composite laminates. Compared with experimental results, it shows that the numerical predicting results agree with the test results fairly well.