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 structure 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-rate in describing the hardening behavior of the 5052-O aluminum alloy sheets.Finally,a validation experiment was conducted based on the determined parameters,and the deformation height,thick-ness,and strain at the marked points of the specimens in the simulation were compared with those in the experiments.The experimental data and the simulation results corroborate with each other,con-firming the reliability.
万方数据
维普
