A New Experimental Technique for the Multi-axial Testing of Advanced High Strength Steel Sheets |
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| Authors: | D Mohr M Oswald |
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| Institution: | (1) Impact and Crashworthiness Laboratory, Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA;(2) Solid Mechanics Laboratory (CNRS-UMR 7649), Department of Mechanics, école Polytechnique, Palaiseau, France;(3) Department of Mechanical and Process Engineering, Swiss Federal Institute of Technology (ETH), Zurich, Switzerland |
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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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| Keywords: | Multi-axial testing Sheet metal Plasticity Yield surface Finite strains TRIP steel Advanced high strength steel |
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