Finite Element Simulation Of Magnesium Alloy Sheet Based On Uniform Pressure Coil

Electromagnetic forming is a process of high-energy and high-velocity. It has the merit of simple equipments, high productivity and good controllability. Especially in the forming of magnesium alloy, the electromagnetic forming has been of the research hotspots in plasticity industries.As is shown in this paper, the author has analyzed the discharge model of electromagnetic forming and deduced the calculation formulas of some discharge circuit parameters. The finite element method has been used to calculate the discharge currents of electromagnetic forming. The elements used in the simulation are described, the input and output parameters are listed in this paper. Model of the electromagnetic field is establishment and the method of the finite element analysis is described. Analysis module is designed by APDL language and the current load approach is determined. The simulation of the electromagnetic forming of sheet metal is achieved by two ways. The order flow and a detailed explanation of the electromagnetic simulation are given.Comprehensive introduction to the ANSYS in the electromagnetic is given. the simulation results are viewed by using ANSYS common post-processing and time-history post-processing. The location and time characteristics are made and each image is analyzed.On the base of the determined magnesium alloy AZ31 Johnson-cook material model, the simulation of the electromagnetic forming deformation field is made by LS-DYNA and the results are viewed by using LSPREPOST software. The simulation results have a good agreement with the experimental results.On the base of numerical simulation, this thesis has researched the regularity of how process parameters affect the discharge current, deformation and the height of the alloy. Changing the parameters of the discharge circuit, under the same conditions by voltage changes, voltage and current draw changes positively correlated peak, but does not affect the frequency of discharge circuit. Then changing the capacitor under the same conditions, the writer found that when the capacitance increases, the discharge rate will decrease, while the peak discharge current has slightly increased.