Interfacial debonding and fiber pull-out stresses of fiber-reinforced composites: VIII: The energy-based debonding criterion

Abstract

The applied stress required to initiate interfacial debonding ( i.e. the initial debond stress) during fiber pull-out was analyzed using an energy-based debonding criterion. It was shown in part VII that the initial debond stress derived from the strength-based debonding criterion is sensitive to the accuracy of modeling. However, the present study shows that the initial debond stress derived from the energy-based debonding criterion is insensitive to the accuracy of modeling. The dependences of the initial debond stress on the material properties ( i.e. the embedded fiber length, elastic constants and radial dimensions of the fiber and the matrix, and the interfacial properties) are also compared for these two debonding criteria.