Prediction of Storage Life of Propellants having Different Burning Rates using Dynamic Mechanical Analysis

Defence Science Journal

V.S. Wani¹  Sunil Jain¹  B. Bhattacharya¹  Mehilal M¹  P.P. Singh¹ 

[1] High Energy Materials Research Laboratory, Pune

关键词: Glass transition temperature;    mechanical properties;    storage modulus;    loss modulus;    polybutadiene;    visco-elastic properties;   

DOI  :  

学科分类：社会科学、人文和艺术（综合）

来源: Defence Scientific Information & Documentation Centre

【 摘 要 】

Propellants, visco-elastic in nature, show time and temperaturedependent behaviour on deformation. Hence, the time–temperaturesuperposition principle may be applied to the visco-elastic propertiesof propellants. In the present study, dynamic mechanical analyser (DMA)was used to evaluate the dynamic mechanical properties and quantify thestorage life of four different propellants based on hydroxyl terminatedpolybutadiene, aluminium and ammonium perchlorate having differentburning rates ranging from 5 mm/s to 25 mm/s. Each sample was given amulti-frequency strain of 0.01 per cent at three discrete frequencies(3.5 Hz, 11 Hz, 35 Hz) in the temperature range - 80 °C to + 80 °C. Thestorage modulus, loss modulus, tan delta and glass transitiontemperature (Tg) for each propellant samples have been evaluated and itis observed that all the propellants have shown time (frequency) andtemperature dependent behaviour on deformation. A comparison of the logaT versus temperature curves (where aT is horizontal (or time) shiftfactor) for all four propellants indicate conformance to theWilliams–Landel–Ferry (WLF) equation. The master curves of storagemodulus (log É versus log ω plots) were generated for each propellant. Aplot of É versus time for all propellants was generated up to 3 years,6 years, and 10 years of time, respectively. The drop in the storagemodulus below the acceptable limit with time may be used to predict theshelf life of the propellant. Defence Science Journal, 2012, 62(5), pp.290-294 , DOI:http://dx.doi.org/10.14429/dsj.62.2480

【 授权许可】

Unknown