MATEC Web Conf.
Volume 80, 2016NUMIFORM 2016: The 12th International Conference on Numerical Methods in Industrial Forming Processes
|Number of page(s)||7|
|Section||Topic 3: Application to metal or multi-metal forming processes|
|Published online||24 October 2016|
Suitability of the electromagnetic ring expansion test to characterize materials under high strain rate deformation
1 Sorbonne universités, Université de Technologie de Compiègne, Laboratoire Roberval, CNRS UMR 7337, Centre de recherche Royallieu, CS 60319, 60203, Compiègne cedex, France
2 Department of Materials Science and Engineering, The Ohio State University, 2041 College Road, Columbus, OH 43210, USA
3 Universités de Bourgogne Franche Comtés, IRTES-LERMPS, Universités de Technologie de Belfort Montbésliard, 90100 Belfort, France
a Corresponding author: email@example.com
Characterisation of materials under high strain rate is always challenging, and requires sophisticated apparatus. Magnetic pulse forming techniques can involve high strain rate deformation and the electromagnetic ring expansion test (ERET) is considered here to determine its suitability to characterise materials at high strain rate. The multi-physics and high speed nature of the process requires advanced numerical modelling techniques to gain insight and understanding of stress development when used as a material characterisation technique. In order to evaluate the suitability of the ERET to fully characterise the material behaviour at high strain rate, stress states were investigated using 3D coupled mechanical-electromagnetic simulations on a validated numerical model. The numerical simulations were performed in LS-Dyna® with a modified Johnson-Cook (MJC) material model in this study. Albeit the preliminary results show the development of biaxial stress during the test, a shielding mechanism is proposed to eliminate the axial component of the stress on the rings. This study indicates that the ERET has a potential to be used for characterisation of the material parameters under the influence of high strain rate.
© The Authors, published by EDP Sciences, 2016
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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