Numerical and experimental study on electrohydraulic forming process

Woo, Min-A; Kim, Hongkyo; Park, Hyeong-Gyu; Kim, Yong Hee; Song, Woo‐Jin; Kim, Jeong

doi:10.1016/j.proeng.2017.10.780

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…EMHF analysis in LS-DYNA employs the "EM" keyword for implementing electromagnetic field analysis and the "ALE" keyword for implementing fluid-structure analy-sis [29,30]. However, it is challenging to integrate EM and ALE analysis techniques into a single step.…”

Section: Electromagnetic Hydraulic Forming Modelingmentioning

confidence: 99%

Numerical Study on Electromagnetic Hydraulic Forming Process to Overcome Limitations of Electromagnetic Forming Process

Kim,

Kim

2024

Materials

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This paper provides a comparison between the conventional Electromagnetic Forming (EMF) technique and the novel Electromagnetic Hydraulic Forming (EMHF) approach. The EMHF involves the use of finite element analysis coupled with the EM and arbitrary Lagrangian–Eulerian techniques analyzed through LS-DYNA. In the free-bulge configuration, EMF is influenced by the forming coil, resulting in a dead zone and uneven forming. Additionally, EMF can only be used to shape materials with high electrical conductivity. In contrast, EMHF, driven by induced hydraulic pressure from the electromagnetic field-affected drive sheet, is independent of the electrical conductivity of the material and produces dome-shaped workpieces. For rectangular die shapes, EMF is prone to collision owing to the acceleration of the blank, which results in a reduced quality owing to bouncing. However, EMHF exhibits no bouncing effect and successfully achieves the target shape in most cases. The two techniques differ in the strain rate, with EMF at 4850/s, whereas EMHF operates at approximately 1250/s. Despite being slower, EMHF is still a high-speed forming technique. In conclusion, EMHF is a promising technique capable of addressing the shortcomings of conventional EMF and achieving improvements in forming processes.

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Section: Electromagnetic Hydraulic Forming Modelingmentioning

confidence: 99%

Numerical Study on Electromagnetic Hydraulic Forming Process to Overcome Limitations of Electromagnetic Forming Process

Kim,

Kim

2024

Materials

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“…In recent years, several research outcomes of pulsed discharge technique have been achieved and widely implemented in many fields. Typical applications include electrohydraulic forming, soil remediation, industrial wastewater treatment, etc [3][4][5]. Especially the impact effect of pulsed high-voltage discharge in water, has been used in the fields of rock disintegrating [6][7][8][9], concrete recovering [10,11], waste printed circuit board processing [12,13] and conduit descaling [14].…”

Section: Introductionmentioning

confidence: 99%

Direct impact characteristics of magnesite fragmentation by pulsed discharge in water

Cao¹,

Wang²,

Ma³

2019

Plasma Sci. Technol.

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To clarify direct impact characteristics (pressure and position) of middle-grade magnesite fragmentation by pulsed discharge in water, this work uses pressure film to accomplish passive measurement through pulsed discharge experiment and obtain the pressure. The impact position is determined by image analysis of fragmentation product morphology, crack edge and discharge channel. Then, pressure load on magnesite surface is numerically analyzed based on the measured pressure obtained from the film. Results indicate that, at 10 mm discharge gap, the impact pressure increases with the discharge voltage, and the discharge voltage to disintegrate magnesite is −40 kV. The impact position is normally in the boundary among different mineral components. Simulation analysis indicates that, the pressure load applied directly on magnesite surface is approximately 142.5 MPa at −40 kV and greater than the compressive strength of magnesite, thus leading to the fragmentation.

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confidence: 99%

Experimental Study on Formability in Electrohydraulic Forming with and without Bridging Wire

Jang,

Kim,

Kim

2024

Preprint

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Electrohydraulic forming (EHF) can overcome the shortcomings of deep drawing and electromagnetic forming, demonstrating a reduced bouncing effect, formation in narrow areas, and no effect on the electrical conductivity of the blank. In existing EHF experiments, wires are fastened to provide a forming force at variable positions. Therefore, production of uniform products is difficult, and the experimentation is time-consuming and difficult to apply in industrial processes. In this study, wireless and wire-cross EHF were presented to reduce the time required for EHF experiments and produce a uniform forming force. The maximum forming height and formability were evaluated using a 0.5 t SUS430 specimen and free-bulging die. The required experimentation time was measured by comparing each EHF with a conventional EHF. The wireless EHF experiments required the least time and produced a constant forming force. A wire-cross EHF was proposed to compensate for the time required to connect the fully connected wires in a conventional EHF. However, this did not substantially reduce the experiment time. Although wire-cross EHF has a higher energy efficiency than wireless EHF because wires are incorporated, it cannot completely overcome the fundamental problems of EHF. In wireless EHF, two consecutive experiments were performed to produce the same height under an applied voltage of 6 kV. When conducting consecutive experiments, if the experiment is ready for the first time, only the capacitor must be repeatedly charged and discharged while maintaining a constant electrode spacing, so the experiment can be completed faster.

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Numerical and experimental study on electrohydraulic forming process

Cited by 5 publications

References 5 publications

Numerical Study on Electromagnetic Hydraulic Forming Process to Overcome Limitations of Electromagnetic Forming Process

Numerical Study on Electromagnetic Hydraulic Forming Process to Overcome Limitations of Electromagnetic Forming Process

Direct impact characteristics of magnesite fragmentation by pulsed discharge in water

Experimental Study on Formability in Electrohydraulic Forming with and without Bridging Wire

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