Constitutive Modeling for Aluminum Alloy Sheets in Non-eddy Current Electromagnetic Forming

Non-eddy current electromagnetic forming is a new type of electromagnetic forming process, which realized high-speed deformation of the workpieces by directly applying pulse current on the metal workpieces instead of induced eddy current. The speed reached 102 m/s and the strain rate was as high as 103 s_1, which did not have a complex coil strueture and the electromagnetic force was more uniform. For the 5052-O aluminum alloy sheets based on the non-eddy current electromagnetic forming experiments and Simulation, the Parameters in the Cowper-Symonds and Johnson-Cook high strain rate constitutive model were determined by using the inverse identification method. The flow stress of 5052-O aluminum alloy sheets was predicted at the high strain rate. By comparing the simu-lated and experimental results, it is confirmed that the Johnson-Cook hardening model is more accu-ratc in describing the hardening bchavior of the 5052-O aluminum alloy sheets. Finally, a Validation experiment was condueted based on the determined Parameters, and the deformation height, thick-ness, and strain at the marked points of the speeimens in the Simulation were compared with those in the experiments. The experimental data and the Simulation results corroborate with each other, con-firming the rcliability. © 2024 Chinese Mechanical Engineering Society. All rights reserved.