含脱粘界面纤维增强复合材料应力传递的理论分析

取具有脱粘界面的连续纤维增强复合材料的特征体积单元为研究对象,在常规剪滞模型的基础上通过引入摩擦力概念,并考虑横向泊松效应及基体径向力作用的影响,得到了纤维、基体的轴向应力及界面剪应力沿纤维方向的解析表达式。结果表明:本文所用的改进剪滞模型能较准确地反映各相介质沿纤维方向的应力分布特征,特别是较清晰地描述了脱粘界面的应力渐变以及界面粘结与脱粘临界处出现的界面剪应力跳跃现象,取得了与有限元解较为一致的结果。

The Theoretical Analysis on the Stress Transfer for Fiber Reinforced Composites with Debonding Interface

In this paper,the representative volume element which is composed of the continuous fiber reinforced composites with debonding interface is taken as the research object.Based on the conventional shear-lag model,a modified shear-lag model including the influence of friction force,transverse Poisson＇s effective and radial force of matrix is established to analyze the fiber stress,matrix stress and interface stress along the direction of fiber.The results show that the modified shear-lag model can reflect the stress distribution characteristic along fiber direction for each phase,and the gradual change phenomenon of normal stress for debonding interface,and the abrupt change for interface shear stress are described,and the results are compared well with those from finite element analysis.