关键词: 端羟基聚了二烯推进剂;裂纹扩展;应力强度因子;应力试验

Abstract: In this paper, guided by Schapery’s theory of viscoelastic fracture, a model crack growth experiment was conducted with of HTPB composite propellant.Crack growth behavior was analyzed, showing that at the beginning of crack growth the critical stness intensity factor KIC exists. The power functional relationship of this propellant between crack growth rate da/dt and stress intensity factor KI was determined. The relationship between the fracture energy of this propellant and crack growth rate was discussed.

Key words: Hydroxy terminated polybutadiene propellant;Crack propagation;Stress intensity factor;Stress test