Investigation of Instrumented Impact Test and Loading Rate Dependency of Fracture Toughness in Brittle Polymers

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In the present study, the effect of the specimen size on the vibrational wave superimposed on the load-deflection curve of polymers is first investigated. Next, in the instrumented Charpy test, a shock-absorbing material is used in order to prevent the generation of a vibrational wave superimposed on the load-deflection curve, and its validity is examined. Further, differences in the impact response curves obtained by the instrumented Charpy test and the one-point bend test are compared and discussed. The results of this study are summarized as follows. (1) The vibrational wave can be prevented by the use of a small specimen which shortens the period of the vibrational wave. (2) The load value is lowered by the use of shock-absorbing material. (3) The differences in the impact response curves and the fracture times obtained from the instrumented Charpy impact test and the one-point bend test are rather large at the lower impact velocity of 3.10m/s; however, the obtained KId values are nearly coincident .

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