Hyperplasticity: Enhanced formability at high rates

Balanethiram, V.S.; Hu, Xiaoyu; Altynova, Marina; Daehn, Glenn S.

doi:10.1016/0924-0136(94)90404-9

Cited by 94 publications

(33 citation statements)

References 11 publications

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“…10). These boundary conditions may act like reflection surfaces for the stress waves, which do not really exist [5]. This problem should be studied more deeply.…”

Section: Resultsmentioning

confidence: 97%

“…Deformation velocity (see Fig. 11) is critical parameter for studying the inertia effects occurred during process [5]. Despite the fact that the magnetic field in gap between the coil and the workpiece is reduced at the end of the coil, the Lorentz' s forces developed in the workpiece and the resultant deformation is higher in this area (see Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The strain rate of the workpiece (see Fig. 14) is higher than 10 −3 s −1 , thus the strain-rate hardening is not negligible [5].…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Physical principles of electromagnetic forming process: a constitutive finite element model

Mamalis

Manolakos

Kladas

et al. 2005

Journal of Materials Processing Technology

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“…10). These boundary conditions may act like reflection surfaces for the stress waves, which do not really exist [5]. This problem should be studied more deeply.…”

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Physical principles of electromagnetic forming process: a constitutive finite element model

Mamalis

Manolakos

Kladas

et al. 2005

Journal of Materials Processing Technology

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“…The timevariant currents passed through the working coil generate eddy currents in the workpiece without making mechanical contact or using a working medium. EMF can be effectively used to form intricate shapes, and its advantages include improved formability and reduced wrinkling [3][4][5].…”

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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“…Electromagnetic forming (EMF) is an impulse forming process showing great promise to improve the formability of lightweight metal alloys [1,2]. Its primary uses are sheet forming, tube compression, and tube expansion [3,4].…”

Section: Introductionmentioning

confidence: 99%

Simulation of tube wrinkling in electromagnetic compression

Demir

Psyk

Tekkaya

2010

Prod. Eng. Res. Devel.

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Wrinkle formation at electromagnetic tube compression was simulated using finite element (FE) method. Three-dimensional (3D) calculations were performed using a staggered coupling scheme between the electromagnetic and structural sides of the problem. Introducing the tube's contour imperfections into the FE model makes the simulation of the wrinkle formation possible. The results show good correspondence with the experiments.

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Hyperplasticity: Enhanced formability at high rates

Cited by 94 publications

References 11 publications

Physical principles of electromagnetic forming process: a constitutive finite element model

Physical principles of electromagnetic forming process: a constitutive finite element model

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

Simulation of tube wrinkling in electromagnetic compression

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