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Electromagnetic Forming Rules of a Stiffened Panel with Grid Ribs

State Key Laboratory of Solidification Processing, School of Materials Science & Engineering, Northwestern Polytechnical University, Xi’an 710072, China
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Metals 2017, 7(12), 559; https://doi.org/10.3390/met7120559
Received: 11 October 2017 / Revised: 15 November 2017 / Accepted: 7 December 2017 / Published: 12 December 2017
(This article belongs to the Special Issue Modern Aerospace Materials)
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Abstract

Electromagnetic forming (EMF), a technology with advantages of contact-free force and high energy density, generally aims at forming parts by using a fixed coil and one-time discharge. In this study, multi-stage EMF is introduced to form a panel with stiffened grid ribs. The forming rules of the stiffened panel is revealed via analyzing the distribution and evolution of the simulated stress and strain in the ribs and web, where the grid-rib panels were decomposed as the flat panel and two panels with uni-directional ribs (ribs only in X direction or Y direction). It is shown that the forming depth is mainly attributed to the forces on the web, although electromagnetic force is applied on both the ribs and the web, especially, large force on the ribs. The ribs are subjected to uniaxial stress parallel to their directions, and the web is subjected to plane stress in the deformation region. Furthermore, the change of the uniaxial stress characteristic in the X-direction ribs is influenced by the electromagnetic force, reverse bend and inertial effect. The plastic deformation mainly occurs in the Y-direction ribs of the deformation region under a three-direction strain state. View Full-Text
Keywords: electromagnetic incremental forming (EMIF); stiffened panel; finite element (FE) simulation electromagnetic incremental forming (EMIF); stiffened panel; finite element (FE) simulation
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Tan, J.; Zhan, M.; Gao, P.; Li, H. Electromagnetic Forming Rules of a Stiffened Panel with Grid Ribs. Metals 2017, 7, 559.

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