Solid Mechanics and Vehicle Conceptual Design

Viscoelastic-viscoplastic constitutive model for modified double base propellant

  • WANG Hongli ,
  • XU Jinsheng ,
  • CHEN Xiong ,
  • ZHOU Changsheng
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  • School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

Received date: 2016-06-07

  Revised date: 2016-08-17

  Online published: 2017-05-12

Supported by

Natural Science Foundation of Jiangsu Province (BK20140772)

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.

Cite this article

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 . DOI: 10.7527/S1000-6893.2016.0238

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