Fatigue behavior of the carbon/epoxy and the carbon/PEEK composites subjected to low-energy impact

摘要

Fatigue behaviors of carbon fiber reinforced thermosetting and thermoplastic composites with and without subjecting low-energy impact were investigated. The [0/45/90-45]_2s T300/976 carbon/epoxy and AS-4/PEEK laminates were used in this study. The impact response of these two laminates shows a linear force-deformation relationship in the initial penetration impact loading, which implies an elastic behavior of these two composites; the following zigzag peaks indicate fracture initiation and arrest. The fatigue tests were performed at various stress levels under tension-tension loadings with a fatigue frequency of 3 and stress ratio of 0.1. The median rank method and Weibull distribution were applied to predict the fatigue probabilities of the specimen under static and fatigue tests. The S-N curves for the undamaged and low-energy impact damaged laminates are compared.