Y.-C. Chiang/ Engineering Fracture Mechanics 65(2000)15-28 I I Crack-til Debonded debonding interface Crack plane Crack-wake debonding Fig. 1. Schematic representation of crack-tip and crack-wake debonding. Matrix Fiber Matrix u(0) Crack PlaneFig. 1. Schematic representation of crack-tip and crack-wake debonding. Fig. 2. A simple shear-lag model. Y.-C. Chiang / Engineering Fracture Mechanics 65 (2000) 15±28 17