Axial Impact of Low Carbon Mild Steel Rod

概要

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Behavior of viscoplastic material under dynamic load was considered for two cases; that is, a longitudinal impact of a rigid mass on a finite rod and a normal impact of a finite rod on a rigid wall. Constitutive equation of Bingham type was modified by taking strain-hardening effect into account. As governing equations of the problems were of nonlinear type with moving boundaries, the difference method was employed to solve them. Numerical results for distributions of particle velocities and of strains and their variations with respect to time differed even qualitatively from the results obtained by a theory without strain-hardening. Experiments on a soft mild steel containing 0.015% carbon were conducted. It was found that the numerical results and experiments for permanent strain distribution agreed well. Variations of strain distribution with respect to time during impact were observed by a high speed camera and numerical results were found to predict the behavior qualitatively.
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