Strain rates in electrohydraulic forming of thin stainless-steel sheet metals
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Date
2025-08-26
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Abstract
Impulse forming technologies can be used for shaping thin sheet metal parts, e.g. bipolar
plates for hydrogen production. Thereby, the energy transmission behaviour to the sheet
metals depends on actual process characteristics. In electrohydraulic forming with
exploding wire, shockwaves are expected to cause transient pressure fields onto the forming
area. This transient force or pressure action realises the punch while the die is a rigid part
of the tool. Hence, one part of the forming tool does not feature a defined geometry. To
understand the impact of such kind of punches the resulting strain field was mapped during
electrohydraulic forming experiments. Different explosion wire materials were used to form
100 µm thin EN 1.4404 / AISI 316L stainless-steel sheet metals. The displacement was
measured in-process with two laser triangulation sensors at different positions. This time
and space resolving data was taken to represent the initial pressure and resulting strain
distribution. The in-process measurements enable further optimisation of the process
settings.
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Keywords
Electrohydraulic Forming,, In-Process Measurement, Energy Transmission
Subjects based on RSWK
Hochenergieumformen, Elektrische Energieübertragung, Blech, Edelstahl, Messung