A micromechanics-driven model for compressive fatigue of fiber-reinforced composites

Abstract

A micromechanics model to predict the fatigue life of fiber-reinforced polymer matrix composites (FRPC) is developed and used for estimating compressive fatigue failure of unidirectional carbon fiber composite. The micromechanics model utilizes constituent, fiber, and matrix material properties. An experimental procedure to obtain the matrix properties that are needed is also described. The model is implemented using the finite element method (FEM). The FEM simulations can predict the classic kink band failure seen in pre–preg-based and textile composites. In addition, an envelope fatigue loading approach is utilized to model the fatigue cycle. Using the combination of matrix fatigue degradation and the fatigue loading method, it is possible to numerically predict the S-N curve, based on the failure mechanics.