Abstract
Polymers are used in various industrial fields for machine parts and structural members. Because of advances in industry, the usage conditions of polymers have undergone various changes, and this has intensified the problems of fatigue and environmental fractures. In this research, an experiment on low cycle fatigue fracture of polycarbonate was performed. Local strain in the vicinity of the notch root and crack tip was measured in real time by means of the fine grid method. The relationships between local strain, crack initiation from the notch and crack propagation have been studied. Finally a method for more precise life estimation is suggested in this paper.
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