电磁成形是一种高速率成形方法,它能够有效提高金属板材的成形极限.但是电磁成形过程复杂,涉及到磁场-结构场之间的耦合分析.数值模拟提供一种手段去解决耦合问题.然而,大多数的数值模拟都限于2D.建立3D有限元模型去分析电磁平板胀形.成形过程中考虑了板料与底模的接触和板料变形对磁场的影响.板料中心节点和半径20 mm处节点的位移随着时间的变化与实验结果一致.分析了塑性应变能和塑性应变.%Electromagnetic forming (EMF) is a high-speed forming method which can be quite effective in increasing the forming limits of metal sheet.However,the EMF process is complicated due to magnetic-structure coupling analysis.Numerical simulation offers an opportunity to overcome the problem.Nevertheless,most present models for EMF process are limited to 2D axisymmetric model.So,a three-dimensional (3D) finite element model was established to analyze the electromagnetic sheet bulging.The contact between the sheet and the die and the effect of sheet deformation on the magnetic field analysis were both taken into consideration during the forming process.The simulation results of deflection at the sheet center and 20 mm away from the center were in agreement with the experimental ones.The plastic strain energy and plastic strain were analyzed.
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