Abstract
To establish a robust theoretical and physical foundation for the safe design and application of heterogeneous polymer-bonded explosives (PBXs), it is essential to elucidate their shock Hugoniot relationship and Jones–Wilkins–Lee (JWL) equation of state (EOS). Based on planar shock wave theory and the Rankine–Hugoniot relations, combined with the relationship between shock wave velocity and particle velocity, symmetric impact experiments were conducted to determine the EOS of the PBX under different shock front conditions. Interfacial particle velocity experiments were performed to characterize the reaction-zone parameters, including the Chapman–Jouguet pressure and the von Neumann spike pressure. Cross-comparison and validation of the results from the two experiments confirmed the reliability of the test method for deriving the JWL EOS parameters for unreacted PBX. For the reacted PBX, the EOS parameters were calibrated using 50 mm-diameter cylinder expansion tests. The reacted JWL EOS parameters were subsequently fitted via an optimization algorithm, providing a critical basis for predicting the internal pressure, density, and energy states of the PBX under higher-amplitude shock loading.