Abstract
Properties of fatigue growth from circular delamination between a unidirectional and a cloth laminates in a GFRP was investigated. The fatigue growth tests were carried out at stress ratios : R=0.1 and -1. The results were as follows. (1) At the stress ratio : R=0.1,the pure mode II fatigue crack growth behavior from circular delamination was different in the crack growth direction. (2) At the same stress ratio, the pure mode II and the pure mode III fatigue crack growth behavior from circular delamination were almost equivalent. However, at R=0.1,it is necessary to take the average of the pure mode II crack growth rate to the bidirection.
