Determination of the High Strain Rate Behaviour of a CuCrZr Alloy Using an Electromagnetic Forming Bench Test
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Date
2025-08-26
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Abstract
A novel electromagnetic forming (EMF) bench test has been developed to characterize the
dynamic behaviour of metallic materials. This paper presents the specific case of a CuCrZr
wrought alloy, detailing both the experimental approach and the inverse numerical
methodology. The primary advantage of the proposed method lies in its ability to calibrate
a dynamic material model, which is particularly relevant for forming applications involving
thin specimens, with thicknesses as low as 0.6 mm. The well-known Johnson-Cook model is
used without consideration of the thermal softening term. The calibration is validated within
the strain rate range of [1-4000]s-1
. It is indeed shown that this method generates a broad
variation of strain rates during the 300 µs test duration. The benefits from using a strain
rate sensitive law as opposed to a quasi-static one are also demonstrated. Analysis of plastic
strains and peak stresses further indicates that the EMF test is particularly well-suited for
ductile materials, whereas brittle materials may fracture prematurely or fail to deform
sufficiently. Limitations regarding the non-uniqueness of the calibrated model and the
incorporation of thermal effects are briefly discussed.
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Keywords
Dynamics,, Forming, Modelling
Subjects based on RSWK
Modellierung, Umformen, Dynamik, Kupferlegierung, Kupfer, Chrom, Zirkonium, Magnetumformen