FRACTOGRAPHIC STUDIES WITH A LINEAR POLYMER WITH SPECIAL CONSIDERATION OF FATIGUE FRACTURE.
COLUMBIA UNIV NEW YORK INST FOR THE STUDY OF FATIGUE AND RELIABILITY
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The observation of fatigue striations on fatigue fracture surfaces of a linear polymer lead to a study of the fatigue fracture mechanism in this material. In order to understand the fatigue fracture the discussion had to be extended to include static tensile fracture, creep fracture and impact fracture. Interest has been concentrated on the appearance of the respective fracture surfaces as a possible clue to the different fracture mechanism because these surfaces reflect the processes involved in the fracture of solids. On the same basis the similarity between fracture phenomena in metals and in polymers is emphasized throughout the paper. The present study has lead to the formulation of a hypothesis for the fatigue mechanism in a linear polymer and of an analytical crack propagation law. Author