高温下奥克托今单晶的冲击响应特性

A heating device which can heat up the explosive sample before experiment is designed to investigate the shock response of octogen (HMX). The designed heating device is used to conduct the plate impact experiments of HMX single crystal at elevated temperatures of 323 K, 373 K and 423 K. The particle velocities on the interface between HMX single crystal and window at different elevated temperatures are measured by using a velocity interferometry system for any reflector (VISAR). The corresponding elastoplastic mechanical parameters of HMX single crystal are obtained by the wave impedance matching method. At an impact velocity of about 300 m/s, the particle velocity curves on the interface between single crystal and window show a distinct elastic-viscoplastic double wave structure. It is found that the Hugoniot elastic limit has no obvious temperature dependence at the elevated temperatures of 323 K and 373 K, which indicates that the plastic deformation mechanism is unchanged. At high elevated temperature of 423 K, the Hugoniot elastic limit increases, showing a thermal hardening effect. The plastic deformation mechanism may change from thermal activation to phonon resistance.