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针对传统内聚力损伤模型(CZM)无法考虑层内裂纹对界面分层影响的缺点,提出了一种改进的适用于复合材料层合板低速冲击损伤模拟的CZM。通过对界面单元内聚力本构模型中的损伤起始准则进行修正,考虑了界面层相邻铺层内基体、纤维的损伤状态及应力分布对层间强度和分层扩展的影响。基于ABAQUS用户子程序VUMAT,结合本文模型及层合板失效判据,建立了模拟复合材料层合板在低速冲击作用下的渐进损伤过程的有限元模型,计算了不同铺层角度和材料属性的层合板在低速冲击作用下的损伤状态。通过数值模拟与试验结果的对比,验证了本文方法的精度及合理性。
Aiming at the defect that CZM can not consider the effect of intralayer cracks on interface delamination, an improved CZM suitable for low velocity impact damage simulation of composite laminates is proposed. By modifying the damage initiation criterion in the cohesion constitutive model of interface element, the influence of the damage state and the stress distribution of the matrix and fiber in the adjacent ply of the interface layer on the interlayer strength and stratification expansion is considered. Based on the ABAQUS user subroutine VUMAT, a finite element model of the asymptotic damage process of composite laminates under low-velocity impact was established based on the model and the failure criteria of laminates. The laminates with different lay angles and material properties Injury at low velocity impact. Through the comparison of numerical simulation and experimental results, the accuracy and rationality of this method are verified.