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A novel technique for dynamic shear testing of bulk metals with application to 304 austenitic stainless steel

Résumé : This paper describes a new single-shear specimen (SSS) and method to characterize the dynamic shear behavior of bulk metals using a traditional Split Hopkinson Pressure Bar (SHPB). By this method, the shear behavior of materials can be tested conveniently over a wide range of strain rates within 105 s−1. This technique was applied to a 304 austenitic stainless steel (ASS) under shear strain rates from 0.001 s−1 to 38700 s−1 at room temperature. Based on finite element (FE) simulations, it was found that the deformation of the specimen shear zone was dominated by shear stress/strain components. Stress state parameters represented by stress triaxiality and Lode angle parameter were found very close to zero, indicating a deformation mode of simple shear. Besides, an obvious gap existed between the local deformation behavior in the specimen shear zone and the macroscopic stress-strain relations measured by the strain gauges on the SHPB bars. A correction coefficient method was adopted to extract the real shear behavior from the experimentally obtained force-displacement data. Through comparisons between the tested and simulated stress-strain curves, a good agreement was obtained.
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Submitted on : Monday, October 26, 2020 - 1:38:46 PM
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Bin Jia, Alexis Rusinek, Raphaël Pesci, Richard Bernier, Slim Bahi, et al.. A novel technique for dynamic shear testing of bulk metals with application to 304 austenitic stainless steel. International Journal of Solids and Structures, Elsevier, 2020, 204-205, pp.153-171. ⟨10.1016/j.ijsolstr.2020.08.019⟩. ⟨hal-02978371⟩

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