A TWO-DIMENSIONAL AXISYMMETRIC NUMERICAL ANALYSIS OF A BAR–BAR TENSILE IMPACT APPARATUS BY ELASTOPLASTIC FEM

At present, a bar–bar Tensile Impact Apparatus (BTIA) is widely used to measure the dynamic tensile properties of solid materials. A BTIA consists of two long bars, between which a specimen is connected. Hence, there are several physical and geometric discontinuous sections in a BTIA. In the present paper, a two-dimensional axisymmetric elastoplastic finite element model for a BTIA with a dumb bell-shaped cylindrical specimen is established. The numerical solution for the model is solved by ADINA. In the scope of elastoplastic theory, the numerical analysis confirms the validity of the 1D experimental measuring principle of BTIA, so long as certain foundations are satisfied. The effects of the specimen geometry and strain rate are also discussed. The matching relation between the specimen and the BTIA system has been studied.