复合材料层合板低速冲击响应和损伤分析

通过在有限元软件Abaqus/Explicit中编写用户材料子程序VUMAT，建立了一种基于能量演化的复合材料低速冲击渐进损伤模型．该模型以三维Hashin准则来预测层内损伤的起始，以一种简化的损伤变量来模拟层内损伤的演化，将具有双线性牵引-分离本构的零厚度界面单元插入层间来模拟分层损伤．采用该模型对14.7 J冲击能量下的纤维增强复合材料低速冲击过程进行了仿真分析，计算得到的冲击力-时间曲线、能量-时间曲线和损伤分布与试验结果吻合较好．根据数值模拟结果，分析了纤维、基体和分层损伤的扩展规律，为低速冲击下的复合材料结构设计提供了理论依据．

Low-Velocity Impact Response and Damage Analysis of Composite Laminates

By means of developing the user material subroutine VUMAT of the finite element software ABAQUS/Explicit, a progressive damage model of composite materials subjected to low-velocity impact was established based on energy evolution. The three-dimensional Hashin criterion and the damage evolution model with the simplified damage variable were used to simulate the intra-laminar damage initiation and evolution, respectively. The zero-thickness interface elements with bilinear traction-separation constitutive law were inserted into the laminates to simulate the delamination damage. The model was used to simulate and analyze the low-velocity impact process of the fiber-reinforced composite materials under the impact energy of 14.7 J. The calculated impact force-time curve, energy-time curve and damage distribution were consistent with the experimental results. According to the results of numerical simulations, the propagation law of fiber, matrix and delamination damage was analyzed, which provided a theoretical basis for the structural design of composite structures under low-velocity impact.