Thermal Radiation Characteristics of RDX-Based PBX Explosives during Shock-Induced Ignition Reactions

Studying the impact initiation radiation and temperature of polymer bonded explosives in the shock wave flow is crucial for understanding and predicting their reaction kinetics and detonation behavior. This work uses the two-stage light gas gun for shock loading, transient radiation pyrometer temperature measurement, and laser displacement interference system, to study the thermal radiation characteristics of the polymer bonded explosive/lithium fluoride window interface and its correlation with the interface pressure. This work optimized the polymer bonded explosives sample preparation method, significantly suppressed the luminous background of the wrapped gas and interface gap, and provided interface radiance data and interface temperature data. The results show that the time attenuation characteristics of the interface temperature during two consecutive impact loading processes are closely related to the isentropic expansion behavior of the reaction products, and the interface temperature reflects the temperature evolution behavior of the products at the interface. It provides a feasible technical way to directly obtained the reaction product temperature of heterogeneous composite explosives during the ignition reaction and energy release.