Characterisation of high strain rate material behaviour for high-speed forming and cutting applications

Determination of the material behaviour for high speed forming processes is challenging due to high process velocity and small specimen geometry in experimental analysis. This paper proposes two different material characterisation concepts for high strain rates at 103 s−1 and higher, namely a pneuma...

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Bibliographic Details
Published in:Journal of physics. Conference series 2018-07, Vol.1063 (1), p.12166
Main Authors: Tulke, M, Scheffler, C, Linnemann, M, Psyk, V, Landgrebe, D, Brosius, A
Format: Article
Language:English
Subjects:
Acceleration
Cutting speed
Hammers
High strain rate
Optimization
Parameter identification
Physics
Specimen geometry
Velocity
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Summary:Determination of the material behaviour for high speed forming processes is challenging due to high process velocity and small specimen geometry in experimental analysis. This paper proposes two different material characterisation concepts for high strain rates at 103 s−1 and higher, namely a pneumatically device and an electromagnetically accelerated hammer, for obtaining experimental values. Furthermore, two measuring principles of the hammer velocity and displacement are presented and compared. The authors describe a measurement system with an acceleration sensor for the pneumatic device and a shadowing principle for the electromagnetically driven concept. Using the measured data, material parameters are iteratively adapted in an optimisation procedure until an objective function, comparing the difference between numerical and experimental results, is satisfied. In this case the parameter identification is applied on a strain rate dependant flow curve approximation based on Johnson-Cook.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1063/1/012166