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基于微观力学失效(MMF)理论对碳纤维增强复合材料(CFRP)多向层合板在低速冲击载荷下失效机制及损伤过程进行分析和预测。建立基于MMF理论的层合板结构冲击损伤行为分析方法。首先,使用MMF理论对冲击过程中组分的失效类别进行判别;然后,根据组分失效的类别制定出相应的材料性能退化方案来实现对复合材料在低速冲击下的逐步失效分析;在ABAQUS平台上开发了基于显示分析的用户材料子程序(VUMAT),即基于MMF理论的层合板冲击损伤分析程序;最后,利用MMF理论冲击损伤行为分析方法,对UTS50/E51碳纤维增强复合材料多向层合板在小能量低速冲击情况下的失效机制和损伤形貌进行预测,并将预测结果与试验结果进行对比,分析了利用MMF理论预测冲击损伤这一方法的准确性。结果表明理论预测的凹坑直径与试验测试的凹坑直径误差为4.8%,预测的失效机制和损伤形貌与实际观察的一致。
Based on the theory of micromechanics failure (MMF), failure mechanism and damage process of CFRP laminates under low speed impact load were analyzed and predicted. The impact damage behavior analysis of laminated structure based on MMF theory is established. Firstly, MMF theory is used to judge the failure types of the components in the impact process. Then, according to the types of component failure, corresponding material performance degradation programs are developed to realize the failure analysis of the composite under low-speed impact. In the ABAQUS platform (VUMAT), which is based on the MMF theory, has been developed. Finally, using MMF theoretical impact damage behavior analysis method, the UTS50 / E51 carbon fiber reinforced composite multi-directional laminate The failure mechanism and damage morphology at low energy and low velocity impact are predicted. The prediction results are compared with the test results, and the accuracy of this method using MMF theory to predict impact damage is analyzed. The results show that the pit diameter of the theoretical prediction and the experimental test pit diameter error of 4.8%, the predicted failure mechanism and damage morphology consistent with the actual observation.