Debonding mechanisms in the presence of an interphase in composites

摘要

The debonding mechanism of an interphase in layered and fiber-reinforced composites was investigate with an emphasis on crack deflection and penetration. A single-edged notched model consist- ing of three phases was analyzed by the boundary element method. The dependence of elastic fields involved in the model on elastic constant combinations was revealed. Interfacial dedonding other than the competition between crack deflection and penetration may be initiated due to the high tensile and shear stress concentration before a main crack propagates to meet the next interface.