改性双基推进剂黏弹-黏塑性本构模型

doi:10.7527/S1000-6893.2016.0238

Abstract

Abstract:

In order to characterize mechanical properties of modified double base propellant, a viscoelastic-viscoplastic constitutive model for modified double base propellant is developed. A series of creep-recovery tests is done to separate the total strain of material into viscoelastic strain and viscoplastic strain. The least square method is used to get viscoelastic parameters, and Nelder-Mead simplex optimization algorithm is combined with backward Euler method to get viscoplastic parameters. Creep-recovery tests under different stress levels and different loading times are conducted to verify the model. The results show that with lower stress levels or shorter loading time, the variation trend of model prediction is consistent with that of the test value,and the percentage of viscoelastic strain and viscoplastic strain in total strain obtained from model agree with that by test. It is concluded that the mechanical properties of the modified double base propellant can be described to some extent by the viscoelastic-viscoplastic constitutive model.

Key words: aerospace propulsion system, solid mechanics, modified double base propellant, viscoelatic-viscoplastic model, creep-recovery

CLC Number:

V512

WANG Hongli, XU Jinsheng, CHEN Xiong, ZHOU Changsheng. Viscoelastic-viscoplastic constitutive model for modified double base propellant[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(4): 220505-220505.

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Viscoelastic-viscoplastic constitutive model for modified double base propellant

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