Prediction method for fatigue life of laminated composites after impact under compression-compression loading

A prediction method for the compression-compression fatigue life of laminated composites with impact damage was developed, which can predict the fatigue life of laminated composites with different ply parameters, geometry measures, and impact conditions based on mechanic properties and fatigue characteristics of unidirectional plies. The whole damage process of laminated composites under the impact loading and fatigue loading was analyzed for avoiding the errors induced by an impact damage hypothesis. The real impact damage status of composite laminates has been applied to analyze the fatigue life. Based on the progressive damage theory, the stress analysis was deduced. A 3-D progressive damage model for laminated composites with impact damage was established. A parametric modeling program was developed to predict the impact damage process and fatigue life of laminated compo-sites, which provides a better technical platform for impact resisting design andfatigue research of laminated composites.