Large Area and Short Pulsed Shock Initiation of A TATB/HMX Mixed Explosive*

The large area and short pulsed shock initiation experiment on a plastic bonded mixed explosive of TATB(80{\%}) and HMX(15{\%}) has been performed with an electric gun where a mylar flyer of 19mm in diameter and 0.05$\sim $0.30mm in thickness is launched by an electrically exploding metallic bridge foil. The cylindrical explosive specimens (\textit{$\Phi $}16mm $\times $ 8mm in size) were initiated by the mylar flyers in thickness of 0.07$\sim $0.20mm, which induced shock pressure in specimen was of duration ranging 0.029$\sim $0.109$\mu $s. The experimental data were treated with the DRM(Delayed Robbins-Monro) procedure and to provide the threshold of shock pressure $P$ 13.73$\sim $5.23GPa. The shock initiation criterion of the explosive specimen is ($P$/GPa)$^{1.451}(\tau/\mu$s) = 1.2. Meanwhile the criterion in 100{\%} probability in the experiment is ($P$/GPa)$^{1.8}(\tau/\mu$s) = 2.63. In addition, the 30$^{\circ}$ wedged specimen was tested and the shock to detonation transition (SDT) process emerging on its inclined surface was diagnosed with a device consisting of multiple optical fiber probe, optoelectronic transducer and digital oscilloscope. The POP plot of the explosive has been gained from above SDT data.