New Forming Limits For Light Alloys By Means Of Electromagnetic Forming And Numerical Simulation Of The Process

2007 ◽  
Author(s):  
P. Jimbert ◽  
I. Ulacia ◽  
J. I. Fernandez ◽  
I. Eguia ◽  
M. Gutiérrez ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Electromagnetic Forming ◽  
Forming Limits ◽  
Light Alloys

Effect of quasi-static pre-strain on electromagnetic forming limits for high strength steel sheets

2017 ◽  
Vol 12 (5/6) ◽  
pp. 436
Author(s):  
Xifan Zou ◽  
Shiwei Yan ◽  
Mengcheng Zhou ◽  
Yu Lei ◽  
Shangyu Huang ◽  
...  
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Electromagnetic Forming ◽  
Forming Limits ◽  
Steel Sheets

scholarly journals Large Ellipsoid Parts Manufacture Using Electromagnetic Incremental Forming With Variable Blankholder Structure

2021 ◽  
Author(s):  
Xiaohui Cui ◽  
Yan Ziqin ◽  
Chen Baoguo ◽  
Du Zhihao ◽  
Xiao Ang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Compressive Stress ◽  
Sheet Metal ◽  
Incremental Forming ◽  
Sheet Material ◽  
Electromagnetic Forming ◽  
Blank Holder ◽  
Load Bearing ◽  
Metal Thickness

Abstract The large ellipsoid parts are the main load-bearing components in the rocket tank, which are prone to wrinkle when using the traditional stamping. In order to solve the wrinkling problem in large parts, the EMIF method with a variable blank holder is proposed in this paper. The numerical simulation has shown that the sheet material near the blank holder is, as a consequence of stamping, subjected to circumferential compressive stress. When the drawing height was 100 mm, the sheet metal was notably wrinkled. In the electromagnetic forming (EMF) process, the sheet region facing the coil becomes thinner. However, the sheet metal thickness corresponding to the coil edge increases with the increase in forming height. If the EMF forming height is 150 mm, the sheet, which is in contact with the smooth mold, is deformed without a wrinkle. Compared to the traditional stamping, the EMF can significantly reduce the sheet metal wrinkling, improving the deformation height of the sheet metal smooth area.

Numerical simulation of magnetic flux and force in electromagnetic forming with attractive force

2007 ◽  
Vol 184 (1-3) ◽  
pp. 190-194 ◽  
Author(s):  
Jianghua Deng ◽  
Chunfeng Li ◽  
Zhiheng Zhao ◽  
Fang Tu ◽  
Haiping Yu
Keyword(s):  
Numerical Simulation ◽  
Magnetic Flux ◽  
Electromagnetic Forming ◽  
Attractive Force

Numerical Simulation of Collision Effect on Damage Evolution in Electromagnetic Forming of Aluminum Alloy Sheet

2018 ◽  
Vol 765 ◽  
pp. 216-221
Author(s):  
Xi Fan Zou ◽  
Shang Yu Huang ◽  
Wei Liu ◽  
Yu Lei ◽  
Jie Zhu
Keyword(s):  
Numerical Simulation ◽  
Damage Evolution ◽  
Volume Fraction ◽  
Alloy Sheet ◽  
Void Volume Fraction ◽  
Electromagnetic Forming ◽  
Void Volume ◽  
Free Form ◽  
Al Alloy ◽  
Form Model

A numerical simulation study of collision effect on damage evolution in electromagnetic forming (EMF) was presented. EMF technology can greatly improve the forming limit of metal sheet duo to the high rate. However, collision behavior is also an important factor for the formability of sheet. Free form model and conical die model were carried out to study the effect of collision behavior on mechanical properties of Al alloy sheet. The EMF process of 1050 Al alloy sheet was analyzed and discussed by numerical analysis software LS-DYNA. The combined strategy of boundary element method and finite element method was adopted to realize the coupling calculation of electromagnetic field and structural field. Based on the GTN material model, the evolution of void volume fraction of 1050 Al sheet were calculated and analyzed. Comparing the free form model results and the die form model results, showed that the collision behavior could reduce the void volume fraction of sheet, but excessively high collision speed lead to the sheet rebound, which aggravated the damage of material and reduce the accuracy of the product. Therefore, the appropriate discharge voltage in this work was found to improve mechanical property of sheet on the premise of forming precision.

Electromagnetic forming of aluminum circular tubes into square tubes: Experiment and numerical simulation

2018 ◽  
Vol 31 ◽  
pp. 613-623 ◽  
Author(s):  
Haiping Yu ◽  
Jie Chen ◽  
Wei Liu ◽  
Huazhe Yin ◽  
Chunfeng Li
Keyword(s):  
Numerical Simulation ◽  
Electromagnetic Forming ◽  
Circular Tubes

Electromagnetic Forming Tools and Processing Conditions: Numerical Simulation

2006 ◽  
Vol 21 (4) ◽  
pp. 411-423 ◽  
Author(s):  
A. G. Mamalis ◽  
D. E. Manolakos ◽  
A. G. Kladas ◽  
A. K. Koumoutsos
Keyword(s):  
Numerical Simulation ◽  
Electromagnetic Forming ◽  
Processing Conditions ◽  
Forming Tools

Limit dome height and failure location of stainless steel tailor-welded blanks

2007 ◽  
Vol 221 (12) ◽  
pp. 1497-1506 ◽  
Author(s):  
M Jie ◽  
C H Cheng ◽  
C L Chow ◽  
L C Chan
Keyword(s):  
Numerical Simulation ◽  
Stainless Steel ◽  
Dome Height ◽  
Forming Limit ◽  
Forming Limits ◽  
Limit Dome Height ◽  
Localized Necking ◽  
Tailor Welded Blanks ◽  
Necking Criterion ◽  
Failure Location

Forming limits of stainless steel tailor-welded blanks (TWBs) are investigated through both testing and numerical simulation. Limit dome height (LDH) tests were performed for 1.2/1.0 mm TWBs with 0°, 90°, 45° weldment orientations and various blank widths. Numerical simulation of the LDH test was conducted with LSDYNA. Since TWB is, in reality, a structure, the forming limits of TWBs in terms of the LDH and failure location should be characterized rather than the conventional forming limit diagrams (FLDs). A localized necking criterion based on the vertex theory was employed to identify the failure sites of TWBs. The localized necking criterion was compiled into a computer program, which processed the output data from LSDYNA. The LDHs and failure locations were computed for various combinations of blank thickness and weldment orientation. The predicted LDH and failure locations were compared with the test results and found to be satisfactory.

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