This paper proposes a modified method to predict composite laminate’s delamination under out-of-plane impact, which takes the interface friction effect as physical mechanism to explain the phenomena of interface strength’s enhancement under transverse load. Firstly, bilinear model is chosen to describe the relationship between traction and separation. Secondly, a macromodel of composite laminate under out-of-plane impact is given to show how the interface strength is enhanced. Contact pair of adjacent layer and interface friction coefficient directly reflects the interface friction effect. Thirdly, criterion of delamination is modified based on the interface friction effect, which derives separation expressions of cohesive element under mixed mode fracture. Numerical example of different interface friction coefficients is given to check the modified method’s rigor and rationality, which is also validated by experiment. Compared with experiment results, the finite element simulation shows that the modified method possesses good accuracy in the prediction of composite laminate’s delamination under out-of-plane impact and definite meaning in the explanation for the phenomena of interface strength’s enhancement under transverse load instead of adjusting parameters of cohesive element subjectively and unreasonably.

本文提出了一种改进的方法来预测复合材料层合板在面外冲击下的分层，该方法以界面摩擦效应为物理机制来解释横向载荷下界面强度增强的现象。首先，选择双线性模型来描述牵引力与分离力之间的关系。其次，给出了复合材料层合板在面外冲击下的宏观模型，以说明如何增强界面强度。相邻层的接触对和界面摩擦系数直接反映了界面摩擦效应。第三，基于界面摩擦效应修正了分层准则，推导了混合模式断裂下内聚元素的分离表达式。给出了不同界面摩擦系数的数值算例，以验证改进方法的严谨性和合理性，并通过实验进行了验证。与实验结果比较，有限元模拟结果表明，改进的方法在预测复合材料层合板在面外冲击下的分层时具有良好的准确性，对解释横向载荷而不是调整时界面强度的增强现象具有一定的意义。主观和不合理的内聚元素的参数。