关键词: 电磁成形, 平板胀形, 数值模拟, 松散耦合法

Abstract: Numerical simulation offers a means of analyzing the multi-physics field coupling process of electromagnetic forming. However, the existing simulations are lmostly limited to 2D model or simplified as independent physics fields. In order to propose a new coupling method suitable for complex 3D models, a three-dimensional finite element model and a loose coupling method are used to analyze electromagnetic sheet free bulging. The Lagrangian algorithm is used for sheet meshes to analyze the sheet deformation process, and the arbitrary Lagrangian-Eulerian algorithm is used for air meshes, so that the air 3D meshes can follow the deformation of the sheet without distortion, thus realizing the iteration coupling analysis of magnetic field and structure field. The dynamic and distortion-free hexahedron meshes can ensure the accuracy of date transfer between the magnetic field analysis module and the plastic forming module. Thereby not only the operational speed is improved, but also accurate calculation results can be obtained. The comparison between the simulation results and the experimental ones indicates the deformation laws in simulation results agree with the experimental ones.

Key words: Electromagnetic forming, Loose coupling method, Numerical simulation, Sheet bulge forming