Fatigue properties of glass-reinforced plastics containing a stress concentrator

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Abstract
Fatigue curves for onset of damage and final separation were obtained under zero-tension loading for plain specimens of GRP laminates, and compared with those obtained for specimens containing a circular hole. The stress concentrator was found to be fully effective in initiating damage, but the effect on ultimate failure was smaller. The results for damage of the specimens with a hole were compared with those predicted from the tangential edge stress distribution and the fatigue properties of the plane material. Agreement was found to be reasonable.