Paper Information

Journal:   MODARES MECHANICAL ENGINEERING   JULY 2017 , Volume 17 , Number 4 #P0099; Page(s) 299 To 306.
 
Paper: 

STUDY OF ELECTROHYDRAULIC FORMING PROCESS BY USING EXPERIMENTAL OBSERVATIONS AND NUMERICAL SIMULATION WITH ALE METHOD

 
 
Author(s):  ZOHOOR MEHDI*, MOUSAVI SEYED MEYSAM, ASHRAFI TAFRESHI AMIN
 
* FACULTY OF MECHANICAL ENGINEERING, KHAJE NASIR TOOSI UNIVERSITY OF TECHNOLOGY, TEHRAN, IRAN
 
Abstract: 

Electrohydraulic forming (EHF) is a high velocity sheet metal forming process in which two or more electrodes are positioned in a water filled chamber and a high-voltage discharge between the electrodes generates a high-pressure to form the sheet. In this study extensive experimental tests were carried out to investigate the effect of different parameters (such as discharge energy, standoff distance and electrodes gap) on the maximum drawing depth and implicit on shock wave maximal pressure in electrohydraulic free forming. EHF is a complex phenomenon and experimental work alone is not sufficient to properly understand this process. To explain different aspects of the problem, Arbitrary Lagrangian Eulerian (ALE) formulations coupled with fluid–structure interaction (FSI) algorithms that are available in the advanced finite element code LS-DYNA were used for the numerical simulation. In order to model the effect of the electrical discharge, two different approaches were implemented; explosive equivalent mass and energy leak. In the first approach, according to the similarity between explosion and electrical discharge in the water, electrical discharge energy was converted to equivalent TNT mass. In the second approach electrodes gap is replaced by a plasma channel and electrical discharge energy was leaked to it in a short amount of time which makes the channel expand and generate shock waves propagating toward the work piece. Finally, a good correlation was observed between the experimental and simulation results.

 
Keyword(s): HIGH VELOCITY FORMING, ELECTROHYDRAULIC PROCESS, NUMERICAL SIMULATION, ARBITRARY LAGRANGIAN EULERIAN
 
References: 
  • ندارد
 
  Persian Abstract Yearly Visit 29
 
Latest on Blog
Enter SID Blog