Research of transient processes under the influence of high-density pulsed current on metal samples made of copper and aluminum to stimulate electroplastic deformation

Abstract

The work is devoted to the study of transient processes under the influence of high-density pulsed current on metal samples made of copper and aluminum to stimulate electroplastic deformation (EPD). These processes are directly related to the electroplastic effect, which is manifested in a decrease in the resistance of metal to plastic deformation and an increase in its plasticity when passing high-density current pulses under mechanical stress above the yield point. Since copper and aluminum are used in the mass production of wires, choosing the optimal parameters for stimulating the EPD of these metals is a particularly important task. A mathematical model has been developed that includes the sequential solution of three related problems: electromagnetic, thermal, and mechanical. A step-by-step implementation of the model in the MATLAB software package is presented. Using the geometric parameters of the samples in the form of copper and aluminum wires, their physical properties and current pulse parameters, the final code of the computer model was compiled in MATLAB. As a result of the simulation, graphs of the average wire temperature, Mises tension, wire deformation, and current density were obtained. Based on the conducted research, practical recommendations for stimulating EPD are proposed, which are reduced to the optimal choice of parameters, the need for temperature control and a decrease in current density or frequency when the temperature exceeds 400 K.