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We investigate the effects of aging and damage on the mechanical behavior of composite modified double-base (CMDB) propellants in uniaxial tension under high-temperature aging. We measure the relaxation modulus curves and stress–strain relationships of CMDB propellants at different accelerated aging times. The results show that aging has a significant effect on the mechanical properties of CMDB propellants. With the increase of accelerated aging time (from 0 to 100 days), the maximum elongation decreases gradually, both the initial and relaxation moduli increase gradually, and the maximum tensile strength fluctuates within a certain range. The mechanism of aging on the mechanical properties of CMDB propellants was analyzed. The master curve of aging relaxation modulus was obtained by using the time-aging time superposition principle, and a model describing the relaxation modulus as a function of accelerated aging time was established. A constitutive model considering aging and strain rate was established based on a viscoelastic continuum damage theory. The model was validated by comparing the predictions with experimental data. The model can accurately predict the stress–strain behavior of CMDB propellants under different accelerated aging times and strain rates.
Mechanics of Time-Dependent Materials – Springer Journals
Published: Dec 1, 2023
Keywords: CMDB propellant; Aging; Strain rate; Damage; Constitutive model
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