Abstract
To determine the long-term Young’s relaxation modulus of composite double-base propellants (CMDB), thermally accelerated aging tests were conducted at 343.15 K for 100 days. Gas chromatography and stress relaxation tests at different aging times were conducted. The aging stress relaxation model has taken into account the change of stabilizer (N-methyl-4-nitroaniline, or MNA) content in accelerated aging. The results show that with the increase of aging time, the MNA content decreases, and Young’s relaxation modulus increases. The time-aging time superposition principle was considered to construct an aging relaxation master curve through a series of short-term stress relaxation curves under different aging times. Based on the master aging relaxation curve and the Prony series models, the conversion time related to the content of MNA was determined. The aging stress relaxation model considering the change of MNA content agrees well with the experimental results and can accurately predict Young’s relaxation modulus of CMDB propellant during thermal aging.
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Liu, Jm., Tong, X., Luo, Xb. et al. The relaxation behavior of composite double-base propellants with various stabilizer content under thermal aging. Mech Time-Depend Mater 27, 651–663 (2023). https://doi.org/10.1007/s11043-022-09573-w
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DOI: https://doi.org/10.1007/s11043-022-09573-w