弱界面复合材料中的基体裂纹

MATRIX CRACK IN A COMPOSITE WITH WEAK INTERFACES

利用二维弹性力学模型研究了纤维增强复合材料中基体裂纹与弱界面的相互作用机理．文中首先导出各向异性弹性多层介质中刃型位错的基本解，然后运用这些基本解建立了弱界面复合材料中典型的Ｈ型缺陷的奇异积分方程组，通过求解这些方程得到外载荷的大小、弱界面的结合强度、界面的残余压力和摩擦系数。

With two-dimensional elastic model,this paper studied the mechanism of the interaction between a matrix crack and weak interfaces in fiber-reinforced composites. The basic solutions of edge dislocations embedded in an anisotropic multi-layered medium were first derived. Then, by using them as kernels,a set of singular integral equations was established for a typical H-shaped defect in weak-interface composites. Finally,the effects of various microstructural parameters, such as interfacial bonding strength,residual stress,ratio of stiffness between the fiber and matrix on the stress distribution near the matrix crack were examined.