EXPERIMENTAL STUDY ON CUMULATIVE DAMAGE OF T300/648 LAMINATES BUILT JOINTS

This paper debatad the damage of the "baring fatigue" in CFRP laminates arouud a loaded hole.according to the theory of the "residual stif fness".It described the damage initiation and propagation by the permanent deformation of a circular hole. This paper gave the definition and measuring method for "damge parameter" and the new notion of the "fatigue damage point".The testing program also was performed to study the effect of temperature and the fatigue life.The damaged specimens were detected and analysed by using "deply technique",X-ray radiographs" and "scanning electron microscopy" to study the damage mechanisms.