Validity of one-dimensional experimental principle for flat specimen in bar–bar tensile impact apparatus

The Bar±bar Tensile Impact Apparatus (BTIA) is widely used to measure the dynamic tensile properties of solid materials. In the present paper, a simpli®ed three-dimensional ®nite element model for the BTIA system with a ¯at specimen is established to simulate the experimental process of a BTIA. The numerical solution for the model is solved by ADINA. In the scope of elastoplastic theory, the numerical analysis con®rms the validity of the one- dimensional experimental principle used in the BTIA, as long as certain foundations are satis®ed