Comparison between Experimental and Calculated Results of Longitudinal Compressive Impact Test for Mild Steel

An annealed mild steel bar (250mm in length, 14mm in dia.) was subjected to compressive impact at various velocities. The experimental results showed that the mild steel possessed particular deformation behaviors such as a delayed yielding phenomenon and an appearance of local residual strain in the neighborhood of the impact end. In addition the analysis of dynamic behavior of the mild steel was made by using a Malvern-type constitutive equation proposed by the authors. From the comparison of the numerical results with the experimental results, it became clear that the experimental phenomena were explainable by the present analysis which takes into account a high strain rate sensitivity for the yield point. It was also found that the effect of strain-rate dependence on the deformation behavior of the bar was large.