关键词: 大型固体发动机；立式贮存；交互试验；累积损伤；艇载

Abstract: In order to study the cumulative damage of large-scale solid motor grains on-board suffering gravity and low frequency vibration for a long time，the sustained loading destruction test, cyclic loading test with fixed stress and creep-fatigue interaction test of HTPB propellant were carried out, and the constitutive equation of interaction damage was obtained. The grain’s stress and strain distribution rules were obtained，by the motor’s finite element calculation under combined loadings of curing, long-time gravity and low frequency vibration. The cumulative damage of the key points and paths on the inner grain was calculated，based on the Miner’s linear damage theory. The results show that creep and fatigue possess asymmetric interaction. The whole grain sinks with long-time gravity, and the displacement decreases successively from the head to the tail, the creep strain accounts for more than 60% of the total strain. The stress and strain change periodically with periodical vibration. The cu?mulative damage of inner grain is linear with storage time, the damage for half a year on vertical storage is 0.0219.

Key words: Large-scale solid rocket motor；Vertical storage；Interaction test；Cumulative damage；Onboard