3D Simulation of magnetic field distribution in electromagnetic forming systems with field-shaper

Bahmani, M. A.; Niayesh, Kaveh; Karimi, Alireza

doi:10.1016/j.jmatprotec.2008.05.024

Cited by 51 publications

(17 citation statements)

References 3 publications

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“…All above were simulated by 2D modeling, and Bahmani et al [17] made a comparison of the 3D and 2D simulation results, which indicated that some higher errors would be resulted by 2D simulation. Moreover, the 3D modeling is crucial for an effective process design in industrial application.…”

Section: Introductionmentioning

confidence: 99%

A triangular prism solid and shell interactive mapping element for electromagnetic sheet metal forming process

Cui

She

Feng

et al. 2017

Journal of Computational Physics

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In this paper, a novel triangular prism solid and shell interactive mapping element is proposed to solve the coupled magnetic-mechanical formulation in electromagnetic sheet metal forming process. A linear six-node "Triprism" element is firstly proposed for transient eddy current analysis in electromagnetic field. In present "Triprism" element, shape functions are given explicitly, and a cell-wise gradient smoothing operation is used to obtain the gradient matrices without evaluating derivatives of shape functions. In mechanical field analysis, a shear locking free triangular shell element is employed in internal force computation, and a data mapping method is developed to transfer the Lorentz force on solid into the external forces suffered by shell structure for dynamic elasto-plasticity deformation analysis. Based on the deformed triangular shell structure, a "Triprism" element generation rule is established for updated electromagnetic analysis, which means inter-transformation of meshes between the coupled fields can be performed automatically. In addition, the dynamic moving mesh is adopted for air mesh updating based on the deformation of sheet metal. A benchmark problem is carried out for confirming the accuracy of the proposed "Triprism" element in predicting flux density in electromagnetic field. Solutions of several EMF problems obtained by present work are compared with experiment results and those of traditional method, which are showing excellent performances of present interactive mapping element.

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Section: Introductionmentioning

confidence: 99%

A triangular prism solid and shell interactive mapping element for electromagnetic sheet metal forming process

Cui

She

Feng

et al. 2017

Journal of Computational Physics

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“…A new electromagnetism (EM) module implemented in LS-DYNA by L'Eplattenier et al is also very promising for coupled mechanical, thermal, and electromagnetic tasks. The electrical fields are determined by the finite element method, and the surrounding air is considered by the boundary element method [11]. Demir et al used ANSYS for three-dimensional calculation of the magnetic field distribution.…”

Section: Introductionmentioning

confidence: 99%

Two-step electromagnetic forming process using spiral forming coils to deform sheet metal in a middle-block die

Noh

Song

Kang

et al. 2014

Int J Adv Manuf Technol

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Two-step electromagnetic forming (EMF) of a metal sheet into the shape of a middle block is proposed in this paper. EMF is a high-speed forming process involving the application of a Lorentz force to the workpiece. The high speed of the forming process produces bouncing of the workpiece, which may result in poor shape accuracy owing to the absence of a medium between the coil and the workpiece. The proposed two-step EMF was used to solve this problem. In the demonstration of the proposed method, a 3D numerical simulation of the current supplied through the forming coil was performed using an LS-DYNA electromagnetism module, and the results were used to select a spiral forming coil with a 50-mm dead zone for the first step of deforming the workpiece. The process did not adequately achieve the desired shape, and, based on the results of another simulation, a second forming coil with a 20-mm dead zone was used for the second forming step of completing the fit with the forming die. The experimental results showed that the accuracy in shape achieved by the proposed multistep forming process was better than that of the single-step process, especially regarding the reduced wrinkling and sharpness of the edge of the workpiece.

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“…[7][8][9] Psyk et al 8 described the development of numerical approaches and implied that accurate 3D simulation could be achieved due to the recent progress of the finite element method. Mamalis et al 10 and Bahmani et al 11 indicated that the magnetic pressures applied on the workpiece under the slit feature are reduced. Bely et al 12 used a special field shaper to adapt a cylindrical compression coil and form a sheet metal workpiece.…”

Section: Introductionmentioning

confidence: 99%

Effect of field shaper geometry on the Lorentz force for electromagnetic sheet impact forming process

Chu

Lee

2013

Proceedings of the Institution of Mechanical Engineers, Part B:

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This article proposes a novel separable field shaper design for electromagnetic sheet impact forming. The efficiency of the field shaper under different geometric parameters was evaluated through a combination of the Taguchi method and three-dimensional coupled simulation. The deviation in impact velocity between the experiment and the simulation was under 3%. The results indicate that the slit feature determines the performance of the field shaper. Wider slits reduce the energy loss resulting from electromagnetic repulsion. In addition, with more field shaper components, the generated magnetic pressure will be distributed more evenly. Based on the analysis result of the nonsymmetric edge effect, some guidelines for designing the field shaper are proposed.

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3D Simulation of magnetic field distribution in electromagnetic forming systems with field-shaper

Cited by 51 publications

References 3 publications

A triangular prism solid and shell interactive mapping element for electromagnetic sheet metal forming process

A triangular prism solid and shell interactive mapping element for electromagnetic sheet metal forming process

Two-step electromagnetic forming process using spiral forming coils to deform sheet metal in a middle-block die

Effect of field shaper geometry on the Lorentz force for electromagnetic sheet impact forming process

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