Analysis of hammering deformation processes by the dynamic explicit finite element method

Based on the dynamic analysis method and central difference explicit algorithm, a dynamic explicit finite element code is developed for modeling the hammering deformation processes, in which hammer velocity is calculated by the energy balance principle. The dynamic upsetting processes of copper block under different hammer velocities are simulated using the developed code, and the deformed configuration, the displacement and the equivalent plastic strain distribution are investigated. Then, the calculated results are compared with that obtained by the static implicit program, and the comparison shows that the results obtained by the developed code are nearly identical to that obtained by the static implicit program under a low hammer velocity, and that there is a great difference between them under a high hammer velocity, which can be explained from the viewpoint of inertial effect and stress wave propagation effect. The research results indicate that the developed code adequately considers the dynamic characteristic under drop hammer impact, and can be used to analyze the effect of hammer velocity on the deformation during the hammering deformation process.