Pulsed Electric Current V-Bending Springback of AZ31B Magnesium Alloy Sheets

• Published in: Metallurgical and materials transactions. A, Physical metallurgy and materials science Vol. 50; no. 6; pp. 2720 - 2731
• Main Authors: Lee, Jinwoo, Bong, Hyuk Jong, Lee, Young-Seon, Kim, Daeyong, Lee, Myoung-Gyu
• Format: Journal Article
• Language: English
• Published: New York Springer US 15.06.2019; Springer Nature B.V
• Subjects: Bend tests; Characterization and Evaluation of Materials; Chemistry and Materials Science; Compression tests; Computer simulation; Deformation effects; Electric currents; Finite element method; Hardening; High temperature effects; Magnesium alloys; Magnesium base alloys; Materials Science; Mathematical analysis; Mathematical models; Metal sheets; Metallic Materials; Nanotechnology; Ohmic dissipation; Resistance heating; Springback; Strain; Structural Materials; Surfaces and Interfaces; Temperature dependence; Thin Films; Yield strength
• ISSN: 1073-5623; 1543-1940
• DOI: 10.1007/s11661-019-05213-0

The springback of AZ31B magnesium alloy sheets subjected to pulsed electric current-assisted V-bending tests was investigated. To study the effect of pulsed electric current on the bending-dominated deformation behavior of magnesium alloy sheets, the stress–strain responses from the electric current-assisted uniaxial tension and compression tests were experimentally measured. The stress–strain curves under pulsed electric current showed an instantaneous stress drop under the application of the electric pulse. The ductility was enhanced owing to the application of electric current. The electrically assisted V-bending tests helped reduce the springback compared with conventional room-temperature V-bending tests, and the magnitude of the springback reduction increased with the increase in the electric current density. A thermo-mechanical-electrical finite element model for the electrically assisted V-bending test was developed. To consider the Joule heating effect, temperature-dependent hardening and a yield function with strength differential were implemented for simulating the AZ31B sheet. The simulations could reproduce the experimental flow stress curves of the uniaxial tension/compression tests under pulsed electric current, characterized by an instantaneous stress drop and subsequent transient hardening behavior. The simulated springback profiles were in good agreement with the measured V-bending test data, thus validating the proposed finite element modeling procedure.