Evaluation of Hugoniot parameters for unreacted Al/PTFE reactive materials by modified SHPB test

Numerical simulation is one of the most effective ways to investigate the internal damage mechanism for reactive materials (RMS), and an adequate equation of state (EOS) is of great importance. Explosives and lasers are widely employed to drive a flying plate to obtain the EOS parameters. However, the velocity achieved by these ways is too high to obtain the corresponding EOS parameters for unreacted RMS because they tend to be deflagrated under the intense dynamic loads. In order to evaluate the shock EOS parameters for unreacted Al/PTFE RMS, this work introduces a direct method based on the split Hopkinson pressure bar (SHPB) test. The traditional SHPB test was developed by adding two polyvinylidene fluoride piezoelectric sensors pasted at the bottom surfaces of cylindrical RM specimens, which could directly obtain the real-time stress wave speed, and the particle speed is tested by the strain gauge in the transmit bar. Therefore, the two key parameters (the elastic wave speed C0 and slope S) in the shock EOS are achieved by the method of directly linear fitting. This work could provide favorable reference for relative simulation researchers of RMS.