The split Hopkinson shear bar (SHSB) test is a modification of the high rate-impact test using a split Hopkinson pressure bar (SHPB). The SHSB has been developed for a variety of techniques, for example, the hat-shaped (circular or flat), double-notch, and punch (with or without notch) techniques. The main purpose of this study was to compare these three techniques to determine the shear stress-shear strain of aluminum alloy 2024-T351. The study was conducted using the Abaqus/CAE® software. The circular hat-shaped and punch (with and without notch) techniques used a quarter-section solid 3D model. The flat hat-shaped and double-notch techniques used a half-section solid 3D model. This study successfully tested and compared the three SHSB techniques, with a number of considerations, i.e. the same parameter values for kinetic energy, shear area and shear angle. Each technique has its own advantages and disadvantages in terms of force equilibrium, flow stress fluctuation, constant strain rate, machine-ability, ease of experiment, etc. The optimum technique among the three is the hat-shaped technique.
It is known that the split Hopkinson pressure bar (SHPB) technique has not been standardized yet. A standardized SHPB technique is necessary to provide guidelines for determining the intrinsic material properties. One possibility to examine the consistency of the SHPB technique is to conduct a mini round-robin test. This paper examines whether consistent results can be achieved from three sets of SHPBs by conducting numerical simulations and physical tests on two metals: commercial copper and 6060-T5 aluminum. Both numerical simulation and physical tests employed three sets of SHPBs, namely, 12.7-mm-diameter SHPB made from the AISI 4140 steel, 13-mm-diameter SHPB made from the high-strength steel (HSS), and 14.5-mm-diameter SHPB made from maraging steel 350 (AISI 18Ni). The current study shows that consistent flow stresses (with an acceptable flow stress fluctuation of ±2.2 %) were obtained from these three sets of SHPBs, which indicates the possibility of SHPB standardization in the future.
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