DAMAGE ACCUMULATION IN GRP LAMINATES WITH CENTRAL HOLE UNDER FATIGUE

Damage accumulation in composite laminates under fatigue has been investigated by many authors.To monitor the compliance change of the specimen is one of the approaches.In this paper Moire method was used to measure the compliance change of GRP specimen after certain fatigue cycles.Since Moire fringes provide whole field of displacement and strain and also concentrate at the crack tip, this method can monitor the compliance change and the propagation of the crack and damage zone.Two kinds of CARP laurinates were investegated and different characteristics of damage propagation were revealed.