Shelf-life prediction and correlation between maximum elongation and stabilizer depletion of CMDB propellant

Abstract

Abstract In order to predict the storage life of composite modified double base propellant (CMDB propellant) at 298.15K, the correlation between the maximum elongation and the stabilizer depletion of CMDB propellant was studied. The thermal accelerated aging tests were carried out at 323.15K, 333.15K, 343.15K and 353.15K. The changes of MNA content and maximum elongation at different thermal aging temperatures were analyzed and a modified exponential aging model for CMDB propellant was proposed. With MNA content and maximum elongation as aging characteristics, the storage life of CMDB propellants at 298.15K was predicted using the modified Arrhenius equation. The aging mechanism of CMDB propellant was analyzed and the correlation function model of maximum elongation and stabilizer depletion was established. The results show that the maximum elongation and MNA content decrease with aging time and aging temperature increasing. The fitting correlation coefficients of modified exponential aging model are all greater than 0.97, which can better describe the changes of MNA content and maximum elongation of CMDB propellant. The storage life of CMDB at 298.15K is estimated to be 19.19 years and 18.09 years, respectively. The validity of the correlation function between the maximum elongation and the stabilizer depletion is verified. The overall error is less than 15%, which provides a reference for predicting the maximum elongation of CMDB propellant by the consumption of MNA.