Study On Fatigue Behavior And Life Prediction Of The CFRP Laminated Composite Material

Nowadays the issue of laminate composite is widely used in the industry and bears the weight of main load with the higher ratios of strength and rigidity. Laminate composite fatigue performance has been important guarantee to security and reliability of structure . So fatigue problems are attached importance to the structure. Lots of engineers research on it. The study of fatigue life prediction has important significance.Fatigue damage form of Laminate composite include fiber breakage , baseboard wrack and delamination. These damage forms may take place at the same time, could affect one and another. The damage represents complex mechanism. In this research based on T300/HT3 laminate structure, fatigue life is predicted phenomenologically, dealing mainly with in-plane stresses without accounting for out-of-plane failures such as craze. Fatigue modulus, based on damage mechanics, is used as a physical parameter which helps to describe the basic fatigue behaviors of unidirectional laminates and obtain expressions for cumulative damages defined by strains and stress. Based on some typical fatigue test data for unidirectional composite laminates, residual modulus sequence is found out. fatigue damage model is so formed. This damage model can describe contacts between internal damage and cycle numbers and fatigue life is so predicted.Laminate composites are often used in the wet environment, composite of colophony body absorbs water very easy. In order to make best of efficiency of composite material in different conditions, testing of samples in distilled...