Electroplastic Effect on the Formability of Annealed AA6061 in Equibiaxial Tension Stress State

Farkhondeh, A.H.; Bakhshi-Jooybari, M.; Gorji, H.; Mirnia, M.J.

doi:10.22084/jrstan.2024.29624.1260

Electroplastic Effect on the Formability of Annealed AA6061 in Equibiaxial Tension Stress State

Document Type : Original Research Paper

Authors

Faculty of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Iran

10.22084/jrstan.2024.29624.1260

Abstract

The use of electric current is an innovative technology in forming processes. Considering the vital role of forming processes in various industrialized applications and the wide utilization of light metal alloys, especially AA6061 aluminum alloy sheets, it is important to examine the electroplastic effect on the formability of AA6061 in different stress states. In this article, the electroplastic effect on the formability of AA6061 sheets in the states of annealing heat treatment and in equibiaxial tension stress states is investigated by the hydraulic bulge test. The appropriate current parameters were first determined from a set of parameters. The results showed that due to the utilization of electric pulses at appropriate current parameters, the fracture pressure was reduced by 6.67%, and the dome height of the bulge was increased by 5.52%. Moreover, by investigating the thickness distribution, the bulge dome thickness was decreased by 6.9%. This shows that in the equibiaxial tension stress state, when the electric current was applied at appropriate current parameters, the formability increased and the forming force decreased. Through theoretical calculation of the biaxial stress curve in
terms of thickness strain, it was observed that by applying the electric current at appropriate current parameters, the formability of the sample increased, and the forming force decreased. As a result, the theoretical results confirmed
the experimental results. The results of this study can be used as a basis for the application of the electroplastic effect to more complex stress states and finally using the electroplastic effect in the industry.

Keywords