Service Life Prediction of Solid Motor during Vertical Storage Based on Accelerated Aging and Actual Loadings

doi:10.3969/j.issn.1000-1093.2019.11.005

Abstract

Abstract: The influences of accelerated aging and actual loadings are both considered in predicting the storage life of solid motor grain during vertical storage. The variation law of the extensibility of propellant was obtained by high temperature accelerated aging test. The variation of von Mises strain of grain dangerous point and the fatigue damage of grain under vibration were obtained by the finite element simulation of motor under two loadings of curing/static vertical storage/blast-off and curing/ dynamic vertical storage. Service life of motor was predicted according to the variation law of von Mises strain and extensibility with storage time. Test results show that the extensibility of propellant decreases with time; the creep effect appears in the grain under a long-term action of gravitational load, and the periodic stresses are generated at the points in the grain under actual loadings. The fatigue damage of grain storaged for half a year is 0.017 12. The storage time has a negative exponent relation with vertical storage frequency, and the allowable vertical storage is 15 times. Its storage life during vertical storage is between 8.24 and 11.75 years, and its storage life under horizontal storage is 17.81 years. Key

Key words: verticalstoragesolidmotor, acceleratedaging, finiteelementanalysis, actualloading, fatiguedamage, servicelifeprediction

CLC Number:

V430

WANG Xin， ZHAO Ruyan， LU Hongyi， LIU Lei， WU Peng. Service Life Prediction of Solid Motor during Vertical Storage Based on Accelerated Aging and Actual Loadings[J]. Acta Armamentarii, 2019, 40(11): 2212-2219.

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第40卷
第11期2019 年11月兵工学报ACTA
ARMAMENTARIIVol.40No.11Nov.2019

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