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

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 10(5) 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 eta and Lode angle parameter (theta) over bar 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. (C) 2020 Elsevier Ltd. All rights reserved.