Numerical simulation of electrohydraulic processes

Viatcheslav S Mamutov,Alexander V Mamutov,A Borodinecs,N Vatin,V Sergeev

doi:10.1051/matecconf/201824509015

Viatcheslav S Mamutov, Alexander V Mamutov + Show 3 more

Open Access

https://doi.org/10.1051/matecconf/201824509015

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Abstract

Using the finite element software complex LS-DYNA 971, the technique of simulating processes of Electro-Hydraulic forming is developed. The law of energy deposition is obtained from semi-analytical calculation. A simulation of complex EHF process, which includes discharge chamber with electrodes, plasma channel, water, deformable blank that is formed into a rigid die, is performed using the developed technique. The simulation is validated by experimental results. The developed technique significantly extends practical usage of numerical simulation of electrohydraulic forming and other electrohydraulic-based technologies.

Highlights

The electrohydraulic effect, a combined effect of shock waves and streams generated during a high-voltage electric discharge in liquid, finds wide use in the various processes of ElectroHydraulic Forming (EHF) of automotive parts and in other areas of manufacturing [1,2,3,4,5,6]
Some assumptions were made for simulating EHF process: regarding discharge current at variable electric resistance of the discharge channel, initiating and expanding the plasma channel, propagating of the pressure wave in the liquid, loading and deforming of the workpiece, similar to that made in [8, 9]
The law of energy deposition is obtained from semi-analytical calculation based on E.V

Summary

Introduction

The electrohydraulic effect, a combined effect of shock waves and streams generated during a high-voltage electric discharge in liquid, finds wide use in the various processes of ElectroHydraulic Forming (EHF) of automotive parts and in other areas of manufacturing [1,2,3,4,5,6]. One of the most efficient Finite Element (FE) software complexes for computer simulation of a high-voltage discharge in liquids is LS-DYNA [10] This software can simulate interacting of several fluids and deformable solids objects through using the Arbitrary Lagrangian Eulerian (ALE) algorithm which, in combination with Multi-Material. In the context of EHF, a simulation of a discharge channel in liquid for the case of cylindrical symmetry was done in work [12], and for the case of a chamber with coaxial closely placed electrodes – in works [13,14,15,16] In these works, electric power laws were used to provide input in LS-DYNA for energy deposit laws into the discharge channel. The goal of this work was creating a complex computer model of EHF process using the software complex LS-DYNA 971 together with calculated function of electric power law as energy deposition into the discharge channel, and to estimate the influence of numerical parameters on results of simulation

Simulation of electrical circuit and plasma

Specifics of simulating discharge

Computer model and results of simulation

Conclusion