Comparison of Two Different Simulation Methods for the Finite Element Analysis of Electromagnetic Forming and Perforation (EMFP) of Tubes

The electromagnetic forming and perforation is a high strain rate dynamic process, carried out within microseconds, and it is difficult to measure the material behavior experimentally; hence, FEA is used. This paper presents the comparison of non-coupled and coupled simulation approach. In non-coupled simulations, using EM fields obtained in Ansys Maxwell, transient magnetic pressure is calculated, and it is used as an input load in the mechanical model. In coupled simulations, structural deformation due to initial Lorentz force is accounted for adjustment of the calculation of electromagnetic fields. This modified EM fields again change the structural deformation. These iterations continue until sufficient convergence is achieved. Thus, in coupled model, mutual dependence between EM fields and structural deformation is considered which is missing in non-coupled simulation. The numerical results are compared with the experimental results, and overall, the coupled simulation results are found to be in good agreement with experimental results.