纤维增强橡胶复合材料界面力学性能有限元分析

基于剪滞理论，引入双线性内聚力模型研究了纤维与基体界面应力传递机理．采用ABAQUS模拟了非理想界面在单纤维拔出过程中的脱粘失效，分析了不同脱粘阶段界面剪应力分布情况，以及界面刚度和纤维长径比对界面应力传递和拔出载荷的影响规律．结果表明，在纤维受载失效过程中，纤维的拔出过程可分为4个阶段，即界面的完全粘结、损伤演化、逐渐脱粘、完全脱粘．界面的刚度和纤维长径比对界面应力传递与最大拔出力均有一定的影响．界面刚度、纤维长径比主要影响纤维的最大拔出载荷以及界面脱粘失效位移．

Finite Element Analysis of Interfacial Mechanical Properties of Fiber Reinforced Rubber Composites

Based on the shear lag theory, the bilinear cohesion zone model is introduced to study the stress-transfer mechanism at the interface between the fiber and the rubber matrix. ABAQUS finite element software were used to simulate the debonding failure of non-ideal interface during the process of fiber pull-out. The distribution of shear stress along the fiber length at different debonding stages was analyzed, and the influences of the interfacial stiffness and the fiber aspect ratio on the interfacial stress transfer and the pull-out load of fiber were analyzed. The results show that the process of interfacial failure under the load can be divided into 4 stages, i.e., bonding, damage evolution, gradual debonding and complete debonding. The interfacial stiffness and the fiber aspect ratio have certain influences on the transfer of interfacial stress and the maximum pullout load. The interfacial stiffness and the aspect ratio of fiber mainly affects the maximum pullout load of fiber and the failure displacement.