Research on the detonation wave interaction in triaminotrinitrobenzene-based plastic-bonded explosive

The detonation wave interactions are characterized by transient high temperature and pressure, and the coupling among multiple wave fronts induces abrupt variations in the pressure flow and temperature field, thereby significantly affecting both the energy release characteristics and the propagation of the detonation waves. To reveal the interaction mechanisms, overdriven detonation experiments were conducted on triaminotrinitrobenzene based plastic-bonded explosive with synchronous initiation from both ends using linear-wave generators. The detonation waveforms and particle velocities under head-on collision and regular oblique reflection conditions were successfully obtained. The dynamic simulations were carried out using ANSYS/LS-DYNA to thoroughly analyze the spatiotemporal evolution of the pressure flow in the collision region. Furthermore, the Mach reflection process was theoretically analyzed using the improved Whitham method based on the Jones–Wilkins–Lee (JWL) equation of state (EOS) and the Jones–Wilkins–Lee–Grüneisen (JWL-Γ) EOS, through which key parameters such as pressure and the critical angle were determined. The results demonstrate that, compared with the standard JWL EOS, the JWL-Γ EOS provides a more accurate prediction of the pressure following detonation wave interactions. These findings offer both valuable theoretical support and engineering guidance for the design of overdriven detonation systems, such as multi-point initiation and shaped charges.