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

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.

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

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.

Numerical Simulation of Heat Transfer of Liquefied Natural Gas in Horizontal Circular Tubes under Supercritical Pressure

2014 ◽  
Vol 960-961 ◽  
pp. 438-441 ◽  
Author(s):  
Hai Yu Meng ◽  
Shu Zhong Wang ◽  
Lu Zhou ◽  
Zhi Qiang Wu ◽  
Jun Zhao ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Pressure Drop ◽  
Natural Gas ◽  
Numerical Simulations ◽  
Supercritical Pressure ◽  
Liquefied Natural Gas ◽  
Design Parameters ◽  
Circular Tubes ◽  
Submerged Combustion

The submerged combustion vaporizer (SCV) is a kind of equipment used for liquefied natural gas (LNG) vaporization. In order to get insights into the heat transfer of supercritical LNG, numerical simulations were carried out in this paper for investigating heat transfer of LNG in horizontal circular tubes under supercritical pressure. Numerical results showed that LNG temperature at the outlet under the design parameters was 276 K which met the demands of application. The velocity of LNG at the outlet was 12 m/s, and the pressure drop along the ducts was 120 kPa.

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