Requirements of Specimen Used for Dynamic Material Testing

Abstract

The measurement accuracy of dynamic material testing is required for the development of design and numerical simulation based on the accurate model of stress-strain relation which is applicable to various strain-rate conditions. In this study, the size and geometry of specimen suitable for dynamic tension tests are evaluated by using finite-element method. At first, a basic cylindrical-shaped specimen with grip parts is examined, and then a plate specimen with the tab parts which are pulled by testing apparatus is modeled to evaluate the actual configuration of the non-coaxial Hopkinson bar method. The results obtained from those analyses show some requirements of specimen used for dynamic material testing concerning the aspect ratio of parallel part, the relation between its length and strain rate, and so forth.