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Pulse Current Effect on Stress Levels in a Metal Strip in Tension
Summary
Experiments on steel strips under tensile load showed that pulse electric current causes stress relaxation when loads increase, but paradoxically increases tensile stresses after load reduction, attributed to microplastic strains of opposing directions. These findings about how microplastic deformation accumulates under cycling loads are relevant to understanding fragmentation mechanisms in plastic materials subjected to repeated mechanical stress.
Results of experimental evaluation of the pulse current effect on stress levels in a stretched steel strip are presented. At the stage of growing loads, stress relaxation in the strip is shown to increase with current densities and loads. After a stepwise decrease in loads, pulse current passage causes an increase in tensile stresses rather than their relaxation. It was suggested that loading and further unloading result in microplastic strains of different directions, which become apparent upon pulse current passage. The phenomenological model of the metal behavior describing the pulse current effect upon loading and unloading is proposed.