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Pressure Wave Analysis in Electrohydraulic Forming - A Multiple Sensor Approach

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Abstract:

Electrohydraulic forming involves a complex energy transfer from the initial plasma explosion through the fluid to the sheet metal, where the pressure wave propagation critically determines the amplitude, distribution, and timing of the resulting acceleration forces. These dynamics can be influenced not only by the explosion itself but also by fluid properties and the geometry and volume of the pressure vessel. To enable systematic process optimization, this study introduced a multi-sensor methodology that captured the transient behavior of the forming process. The approach integrated piezoelectric pressure sensor measurement and high-speed backgroundoriented schlieren imaging to analyze the pressure wave propagation, as well as in-situ two-point laser triangulation to monitor the sheet metal displacement. Experiments using different exploding wires varying discharge energies demonstrate the method’s effectiveness. The results reveal different pressure wave velocities from 800 m/s to 1700 m/s and link displacement data to waveinduced impulses. Additional phenomena such as process-related light emissions and cavitation bubble formation were temporally resolved. The study further introduced that, after an initial learning phase with full sensor integration, selected sensors can be omitted in specific scenarios without loss of essential information, highlighting the efficiency and adaptability of the proposed diagnostic approach.

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Periodical:

Solid State Phenomena (Volume 389)

Pages:

107-114

DOI:

https://doi.org/10.4028/p-Odegn2

Citation:

Cite this paper

Online since:

April 2026

Authors:

Lasse Langstädtler*, Andreas Tausendfreund, Christian Schenck

Keywords:

Electrohydraulic Forming, Pressure Wave, Schlieren Imaging, Shockwave

Funder:

The publication of this article was funded by the University of Bremen

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Creative Commons CC BY 4.0

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* - Corresponding Author

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