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| Accelerated Test Method of Composite Solid Propellant with Constant Strain-Temperature Cycle |
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| DOI：10.7643/issn.1672-9242.2022.05.008 |
| KeyWord:composite solid propellant, constant strain, temperature cycle, accelerated test method, modified Coffin-Manson model reliable storage life |
| Author | Institution |
| WEI Xiao-qin |
Southwest Institute of Technology and Engineering, Chongqing , China;Key Laboratory of Ammunition Storage Environmental Effects of China South Industries Group Co., Ltd., Chongqing , China;Mohe National Field Scientific Observation and Research Station for Atmospheric Environmental Material Corrosion, Heilongjiang Mohe , China |
| LI Han |
Southwest Institute of Technology and Engineering, Chongqing , China;Key Laboratory of Ammunition Storage Environmental Effects of China South Industries Group Co., Ltd., Chongqing , China |
| ZHAO Yang |
Southwest Institute of Technology and Engineering, Chongqing , China;Key Laboratory of Ammunition Storage Environmental Effects of China South Industries Group Co., Ltd., Chongqing , China |
| LI Ze-hua |
Southwest Institute of Technology and Engineering, Chongqing , China;Key Laboratory of Ammunition Storage Environmental Effects of China South Industries Group Co., Ltd., Chongqing , China |
| ZHAO Fang-chao |
Southwest Institute of Technology and Engineering, Chongqing , China;Key Laboratory of Ammunition Storage Environmental Effects of China South Industries Group Co., Ltd., Chongqing , China |
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| Abstract: |
| This paper is to establish a accelerated test method of composite solid constant strain-temperature cycle. The finite element analysis software MSC.PATRAN was used to simulate and calculate the maximum von Mises strain at the extreme point where a certain type of case-bonded casting solid rocket motor solidifies and cools from zero stress temperature (68 ℃) to normal temperature (20 ℃). The self-made strain loading device was used to apply a certain strain to the composite solid propellant. The temperature change law of the long-term warehouse storage of the solid rocket motor was analyzed, and then the temperature cycle acceleration test of composite solid propellant under four groups of different stress levels were designed and carried out on the basis of taking into account simulation and acceleration. Appropriate performance degradation model and accelerated life model were selected to evaluate the reliable warehouse storage life of composite solid propellant. The maximum von Mises strain at the extreme point where a certain type of case-bonded casting solid rocket motor solidifies and cools from zero stress temperature to normal temperature was 9.4%. The highest test temperatures of the 4 groups of temperature cycle accelerated tests of composite solid propellants were 75, 75, 60, 60 ℃, and the temperature differences were 5, 10, 15 ℃, and the duration of a single cycle was 24 h. The aging performance parameters of composite solid propellant under four temperature cycle accelerated test conditions were the maximum tensile strength retention rate, and the degradation law of the maximum tensile strength retention rate was conformed to the exponential performance aging mathematical model when the confidence level was 0.9. Combined with the critical value of failure, the minimum accelerated life with a confidence level of 0.9 is calculated to be 59, 100, 203, and 342 d, respectively. Based on the modified Coffin-Manson model and using the multiple regression analysis method, it was calculated that the minimum storage life of the composite solid propellant in the long-term warehouse storage environment (the maximum temperature was 298 K, and the annual average temperature difference was 15 K) with a confidence level of 0.9 was 20 years. On the basis of taking into account simulation and acceleration, a constant strain-temperature cycle accelerated test method for composite solid propellants was established, and the exponential performance degradation model and the modified Coffin-Manson accelerated life model were used to quickly obtain the minimum warehouse storage life of composite solid propellants and lay the foundation for the storage life estimation of solid rocket motors. |
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