Abstract: The fast burning of cast-loaded TNT/RDX/Al explosive with metal shell at fast thermal effect was experimented to obtain its thermal response characteristics and ascertain the feasibility of fiber-optic probe to measure the propagation velocity of chemical reaction front. A fast heating equipment is used to fast heat a steel tube, which is 400 mm in length, filled with cast-loaded TNT/RDX/Al explosve, and the propagation velocity and path of chemical reaction front are measured by using the fiber-optic probe. The result shows that the propagation velocity of chemical reaction front is 200~1 000 m/s when the open end of steel tube is covered with an end cap. Its propagation velocity is 200~500 m/s when the open end is not covered with the end cap. The detonation dosen't happen and the state of chemical reaction is fast burning. So the thermal response state of cast-loaded TNT/RDX/Al explosives at fast heating rate is rapid burning. The fiber-optic probe can be used to obtain the propagation velocity of chemical reaction front at less than 1 000 m/s. Key

Key words: ordnancescienceandtechnology, cast-loadedTNT/RDX/Alexplosive, fastthermaleffect, fastburning, fiber-opticprobe