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Numerical Study of Electrohydraulic Forming Using an Arbitrary Lagrange-Eulerian Method

Arbitrary Lagrange-Eulerian 기법을 활용한 액중 방전 성형의 해석적 연구

  • Received : 2015.11.13
  • Accepted : 2015.12.03
  • Published : 2016.02.01

Abstract

Electrohydraulic forming (EHF) is a high-speed forming process that uses an electric arc discharge in water. Shock waves resulting from the electric arc discharge are propagated to the blank through water and the blank moves toward the die. Advantages of EHF include improved formability due to the high-speed process and reduction of the bouncing effect. In the current study, a numerical simulation of EHF was developed using LS-DYNA. In the simulation, the model for the electric arc was assumed as an adiabatic gas expansion and an Arbitrary Lagrange-Eulerian (ALE) multi material formulation was used to describe the interaction between the electric arc and the water. In order to model the Fluid-Structure Interaction (FSI), a coupling mechanism was used. The blank of Al 1100-O was simulated using shell elements. The results of the simulation showed that the blank was deformed due to the pressure propagation of water and the bouncing effect did not affect the formability of blank.

Keywords

Electrohydraulic Forming;Bouncing Effect;Arbitrary Lagrange-Eulerian;Fluid-Structure Interaction

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Acknowledgement

Grant : 설계기반 미래성형 기술개발