ABSTRACT
The recent escalation of dynamic loading activities such as explosions, seismic events and missile penetrations necessitates the characterization of materials in such environments in order to develop appropriate prevention and remediation protocols. The split Hopkinson pressure bar (SHPB) is widely used to simulate high-strain loading conditions in order to comprehend the material's behavior. A review of the literature indicates that conventional SHPB is inadequate for analyzing brittle materials such as concrete and rock and yielding desirable results. The behavior of the subject material is governed by the shapes of incident pulses in SHPB. In light of this, the authors of this study propose a novel numerical technique for generating a desired pulse for the analysis of brittle materials subjected to high strain rates. To develop an incident pulse with minimal oscillations in the incident bar, a parametric study of the striker's shape was conducted. The SHPB setup is numerically simulated using LS-DYNA®, and the Johnson-Holmquist-2 (JH-2) model is used to model brittle material. In addition, a comparative study has been conducted to confirm the practicability and effectiveness of the proposed pulse-shaping technique.
