(华中科技大学 材料成形与模具技术国家重点实验室，武汉 430074)
摘 要: 为了解决电磁管件胀形过程中磁场−结构场之间迭代耦合3D模拟的问题，采用ANSYS/EMAG得到不同时刻管件上的磁场力分布，并将节点力作为载荷输入到ANSYS/LS-DYNA进行管件动态塑性变形分析；然后将变形后的管件和空气网格输入到ANSYS/EMAG进行下一步的磁场分析。在管件变形过程中，对空气层网格采用任意拉格朗日算法，使空气网格能够随着管件的变形而有规则地变化，避免空气单元畸变。结果表明：管件外表面轴向中心点随时间位移值与实验结果基本一致；管件最终外表面轮廓与实验结果基本吻合；管件外表面轴向中心点位移与实验结果的误差为2.5%。
关键字: 电磁成形；管件胀形；松散耦合法；有限元模拟；磁场力
loose coupling method
（State Key Laboratory of Material Processing and Die and Mould Technology,
Huazhong University of Science and Technology, Wuhan 430074, China）
Abstract:In order to overcome the magnetic-structure coupling problems in three-dimensional simulation of electromagnetic tube bulging, the ANSYS/EMAG was used to obtain the magnetic force on the tube at different times, and the magnetic force used as loading condition was imported into ANSYS/LS-DYNA to predict the dynamic deformation process on the tube. Then the deformed meshes of the tube and the air were imported into ANSYS/EANG to analyze the magnetic force on the tube. In the process of the tube deformation, the arbitrary Lagrangian-Eulerian algorithm was used in air mesh to make it change regularly with the deformation of the tube. This will avoid the air meshes distortion. The displacement at the center of the outer surface along the tube axis with time agrees with the experimental one. The final profile of the outer surface of the tube is in very good agreement with the measured one. The relative error of deflections at the center of the outer surface along the tube axis is 2.5%.
Key words: electromagnetic forming; tube bulging process; loose coupling method; numerical simulation; magnetic force
