基于松散耦合法的电磁平板成形3D有限元仿真

Loose Coupling Simulation for Electromagnetic Sheet Forming:3D Finite Element Method

数值模拟提供一种手段去分析电磁成形中的多物理场耦合过程,但是目前的电磁成形模拟大多局限于2D模型或者将复杂的多物理场耦合数值模型简化为单独的多个物理场分别进行求解。为提供一种能够适用于复杂3D模型的多场耦合模拟方法,采用松散耦合法对平板电磁自由胀形过程进行3D有限元模拟分析。对工件网格采用拉格朗日算法,空气网格采用任意拉格朗日欧拉算法。从而使空气3D网格能够与板料变形随动而不产生畸变,实现磁场—结构场的迭代耦合分析。动态而无畸变的六面体网格能够在磁场分析模块与塑性成形模块间准确传递数据,既提高了运算速度又可获得精确计算结果。与实际数据比较证明,模拟的板料变形规律与试验结果一致。

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.