Title: Identification of strain-rate-dependent hardening model for aluminium alloy sheet in electromagnetic forming

Authors: Yangzhe Lin; Zhigang Xu; Wei Liu; Zhenghua Meng; Shoulu Zhou

Addresses: School of Materials Science and Engineering, Wuhan University of Technology, 122, Luoshi Road, Wuhan, China ' School of Automotive Engineering, Wuhan University of Technology, 122, Luoshi Road, Wuhan, China ' School of Materials Science and Engineering, Wuhan University of Technology, 122, Luoshi Road, Wuhan, China ' School of Automotive Engineering, Wuhan University of Technology, 122, Luoshi Road, Wuhan, China ' School of Materials Science and Engineering, Wuhan University of Technology, 122, Luoshi Road, Wuhan, China

Abstract: The deformation rate of aluminium alloy sheet reaches up to thousands per second in the electromagnetic forming process, and how to obtain the hardening behaviour of aluminium alloy sheet at such high strain rate becomes an essential issue. The electromagnetic hole-flanging test is proposed to simplify the deformation process. Based on the electromagnetic hole-flanging test, the inverse identification procedures are adopted to calibrate the strain-rate-dependent hardening models of aluminium alloy sheet. For the Johnson-Cook and Cowper-Symonds hardening models, the strain-hardening terms were initially determined by the quasi-static uniaxial tensile tests to simplify the inverse procedures. Then, the strain-rate-dependent terms were identified by comparing the simulated and experimental strains of the electromagnetic hole-flanging test. It was validated to calibrate the Johnson-Cook and Cowper-Symonds models of AA5754 aluminium alloy sheet by combining the electromagnetic hole-flanging test with the quasi-static tensile test.

Keywords: electromagnetic forming; aluminium alloy sheet; hardening model; high strain rate; Johnson-Cook model; Cowper-Symonds model; numerical simulation; flat spiral coil; flanging; inverse identification.

DOI: 10.1504/IJMPT.2022.124741

International Journal of Materials and Product Technology, 2022 Vol.65 No.2, pp.95 - 106

Received: 15 Feb 2021
Accepted: 15 Sep 2021
Published online: 08 Aug 2022 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article