M-shaped Specimen for the High-strain Rate Tensile Testing Using a Split Hopkinson Pressure Bar Apparatus |
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Authors: | D. Mohr G. Gary |
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Affiliation: | (1) Solid Mechanics Laboratory, CNRS UMR 7649, Department of Mechanics, école Polytechnique, 91128 Palaiseau Cedex, France;(2) Impact and Crashworthiness Laboratory, Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA |
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Abstract: | An experimental technique is proposed to determine the tensile stress–strain curve of metals at high strain rates. An M-shaped specimen is designed which transforms a compressive loading at its boundaries into tensile loading of its gage section. The specimen can be used in a conventional split Hopkinson pressure bar apparatus, thereby circumventing experimental problems associated with the gripping of tensile specimens under dynamic loading. The M-specimen geometry provides plane strain conditions within its gage section. This feature retards necking and allows for very short gage sections. This new technique is validated both experimentally and numerically for true equivalent plastic strain rates of up to 4,250/s. |
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Keywords: | Finite element analysis Fracture High strain rates Hopkinson bar Kolsky bar Plasticity Tensile testing Transverse plane strain |
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