陶瓷基复合材料单纤维拔出力学分析

建立了考虑界面滑动摩擦的复合材料单纤维拔出力学模型,得到了包含泊松效应影响的基体轴向应力、纤维轴向应力和界面剪切应力的表达式.针对SiC/RBSN陶瓷基复合材料,在部分脱粘/滑移和完全粘结情况下,对纤维、基体、界面的应力分布进行了分析.计算结果与有限元计算结果相比,具有较好的一致性.结果表明:纤维百分含量的变化能够改变界面发生脱粘/滑移失效点的位置;界面发生脱粘/滑移后的脱粘扩展比界面完全粘结的脱粘扩展更容易发生;不考虑热不匹配的影响,仅通过增加界面摩擦系数不能使应力重分布发生很大变化. 

Mechanical analysis of single fiber pull-out on ceramic matrix composites

A mechanical model of single fiber pull-out for composites was established if considering the interfacial frictional sliding.The expressions of the matrix axial stress,the fiber axial stress and interfacial shear stress including Poisson's effect were obtained.As for SiC/RBSN ceramic matrix composites,the stress distributions of fiber,matrix and interfaces was analyzed under partial debonding/slipping and full debonding.The calculated results were well consistent with the finite element results,showing that the variable fiber volume fraction could change the failure point of debonding/slipping on the interface.The debonding propagation of interface occurs more easily in partial debonding/slipping than in full debonding.The stress distribution changes little if only the interface friction coefficient is increased without considering fiber/matrix thermal mismatch.