抄録
The fatigue crack growth behavior in glass mat reinforced polyester laminate was investigated by macroscopic observations and discussed from the view point of fracture mechanics.
The main fatigue crack was found to propagate after the debonding between fibers and resin took place and the damage zone increased at the fatigue crack tip. The fatigue crack length was determined by the compliance method, since the fatigue crack tip was not clear. The fatigue crack growth law was easily determined by ΔK-controlled tests of the materials. It was found that the crack growth rate of the specimen containing thick fibers was lower than that of the specimen containing fine fibers at the same stress intensity factor range and the same fiber content in weight.
