Abstract: The launching tube for rockets which constitute by steel inner lining and composite outer lining has high strength and repeatability but with lower weight. But the coupling structure takes on complex characteristic of thermal under the high temperature rocket jet flow. The simulation of thermal has been done with the ABAQUS software for a steel-composite launch tube, the distribution of temperature for the launch tube has been obtained. The simulation indicates the highest temperature at joint face is 268℃,and the temperature along the tube during 4min refrigeration is basically less than 150℃ except the both sides. The analysis results indicate that the thermal action of jet flow to the launch tube is very strong. The study provides theory warranty for the structure and thermal design of the tube, and has important references to the choice of composite material and bond.

Key words: steel-composite, launch tube, coupling, thermal analysis