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通过建立有效的3D有限元模型,对复合材料层合板在低速冲击下的损伤行为进行分析和预测。层合板面内损伤采用改进的Chang/Chang失效准则做判据,得到面内各类损伤形式,如纤维断裂、纤维挤压、基体开裂、基体挤裂等。层合板层间损伤采用TIEBREAK接触模拟,该接触结合传统的应力失效判据和断裂力学中的能量释放率准则来预测层间分层的起始和扩展。数值计算结果和实验结果对比分析表明,该方法是合理和准确的。
Through the establishment of an effective 3D finite element model, the damage behavior of composite laminates at low velocity is analyzed and predicted. The in-plane damage of the laminates was evaluated by using the improved Chang / Chang failure criteria, and various in-plane damage patterns were obtained, such as fiber breakage, fiber extrusion, cracking of the matrix and matrix cracking. TIEBREAK contact simulation of interlaminar interlayer damage is used to predict the initiation and propagation of interlaminar delamination in combination with the traditional stress failure criteria and the energy release rate criterion in fracture mechanics. The numerical analysis and experimental results show that the method is reasonable and accurate.