Abstract
The strict design and numerical simulation based on the precise model of stress-strain relations which is applicable to various strain-rate conditions require the accurate measurement of the stress and the strain in the dynamic material testing. Co-axial split Hopkinson bar appatatus is the most commonly used device for dynamic compression tests, however, it is difficult to be transformed for dynamic tension tests because of its complicated configuration for the tension test. On the other hand, the Non-coaxial Hopkinson bar apparatus (NCHBM) is one of the recently proposed dynamic tension tests and its configuration is quite simple. In this study, the accuracy of the stress-strain relation obtained by NCHBM is examined by using FEM code 'LS-DYNA'. The effects of the rising time of applied velocity, the size and geometry of specimen, the boundary condition, and so forth on flow-stresses are discussed.
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