Modeling of Interfacial Debonding in Unidirectionally Fiber-Reinforced Ceramics

摘要

The initiation and growth of the debonding are strongly affected by the mechanical interactions among the spatially distributed broken components and interfaces. To describe the influences of the interactions on the debonding, modeling based on the shear lag analysis was carried out using two-dimensional elastic fiber/elastic matrix composite, which enables us to obtain a rough solution under influences of the residual stresses and frictional shear stress at the debonded interfaces. The following features were revealed; (1)the debonding is hastened by the interactions, (2)the existence of the frictional shear stress at debonded interface reduces the growth rate of the debonding, (3)the existence of tensile and compressive residual stresses in the matrix and fiber along the fiber direction acts to hasten the growth of the de-bonding when the broken component is the matrix, while it acts to retard it when the broken component is fiber, and (4)the growth rate of the debonding for the energy release rate criterion tends to be higher than that for the shear stress criterion.