Abstract
Fatigue tests of a push-pull loading were carried out on the smooth specimens of polycarbonate at the speed of 2Hz at room temperature. The roles of very small inclusions and shear bands in the initiation and growth of fatigue crack on the surface of specimen were investigated. This is accomplished by careful successive observations by using the replica of cellulose methyl ether. It was found that the initiation of the surface crack appeared from the fine inclusions near the surface of specimens at 20-30% of the fatigue life, and that the surface crack from these inclusions was hindered by the shear bands that formed at their ends. The final length of surface crack is strongly influenced by the stress amplitude. The characteristic behaviors of the crack initiation and growth on the surface of the smooth specimens of polycarbonate were discussed in terms of the mechanical properties and yield behavior of the material.
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