Fatigue Life Predication of Notched Composite Material Laminates

Based on damage theory and strain equivalent hypothesis,a fatigue model is presented in which the residual strain and stiffness degradation are included.A high capability composite material 300/KH304 developed recently is studied in this paper.Using this model,the fatigue life of these laminates with 5 mm holes is predicated.At the same time the fatigue tests are carried out under different stress levels.Compared with the result,the relative tolerance is less than 12.2%.