A Method of Restraining the Geometric Dispersion Effect on Split-Hopkinson Pressure Bar by the Modified Striker Bar

Abstract

In order to restrain the geometric dispersion effect of the stress-wave propagation on conventional split-Hopkinson pressure bar (SHPB), the modified striker bar in Hopkinson bar-loaded test system is selected. Both the experiments and the simulation using ANSYS/LS-DYNA finite element method (FEM) were performed to investigate the modified effect. After verifying the effectiveness of the used program, six modified geometries of the striker bar were simulated. The optimization results in the simulation were further compared with that of the experiment. It was found that the geometric dispersion effect of the incident pulse under the same loading condition can be restrained effectively by modifying the striker bar. Moreover, the experimental incident pulse has a good agreement with that of the numerical simulation curves. By investigating various cases, several typical incident pulses can be obtained through different modified striker bars, and these modified approaches are simple and easy to be achieved.