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A New Experimental Technique for the Multi-axial Testing of Advanced High Strength Steel Sheets

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Abstract

This paper deals with the development of a new experimental technique for the multi-axial testing of flat sheets and its application to advanced high strength steels. In close analogy with the traditional tension-torsion test for bulk materials, the sheet material is subject to combined tension and shear loading. Using a custom-made dual actuator hydraulic testing machine, combinations of normal and tangential loading are applied to the boundaries of a flat sheet metal specimen. The specimen shape is optimized to provide uniform stress and strain fields within its gage section. Finite element simulations are carried out to verify the approximate formulas for the shear and normal stress components at the specimen center. The corresponding strain fields are determined from digital image correlation. Two test series are performed on a TRIP-assisted steel sheet. The experimental results demonstrate that this new experimental technique can be used to investigate the large deformation behavior of advanced high strength steel sheets. The evolution of the yield surface of the TRIP700 steel is determined for both radial and non-proportional loading paths.

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Acknowledgement

Thanks are due to Professor T. Wierzbicki from MIT for valuable discussions. ThyssenKrupp Steel (TKS Germany) is thanked for providing the TRIP700 sheet material. The dual actuator testing machine has been designed jointly with Mark Shorey from Instron (Canton, MA). The help of MIT’s Bioinstrumentation Lab on the EDM machining of the specimens is gratefully acknowledged.

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Authors and Affiliations

  1. Impact and Crashworthiness Laboratory, Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA

    D. Mohr & M. Oswald

  2. Solid Mechanics Laboratory (CNRS-UMR 7649), Department of Mechanics, École Polytechnique, Palaiseau, France

    D. Mohr

  3. Department of Mechanical and Process Engineering, Swiss Federal Institute of Technology (ETH), Zurich, Switzerland

    M. Oswald

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  1. D. Mohr
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  2. M. Oswald
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Correspondence to D. Mohr.

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Mohr, D., Oswald, M. A New Experimental Technique for the Multi-axial Testing of Advanced High Strength Steel Sheets. Exp Mech 48, 65–77 (2008). https://doi.org/10.1007/s11340-007-9053-9

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  • DOI: https://doi.org/10.1007/s11340-007-9053-9

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