A nonlinear viscoelastic constitutive model for cyclically loaded solid composite propellant

Tong, Xin;Xu, Jinsheng;Doghri, Issam;El Ghezal, Marieme Imene;Chen, Xiong;et.al.
(2020) International Journal of Solids and Structures — Vol. 198, p. 126-135 (2020)

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Authors
  • Tong, XinSchool of Mechanical Engineering, Nanjing University of Science & Technology, China
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  • Xu, JinshengSchool of Mechanical Engineering, Nanjing University of Science & Technology, China
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  • Doghri, Issamorcid-logoUCLouvain
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  • El Ghezal, Marieme Imenee-Xstream Engineering, Axis Park-Building H, Mont-Saint-Guibert, Belgium
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  • Chen, XiongSchool of Mechanical Engineering, Nanjing University of Science & Technology, China
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Abstract
In this paper, a novel nonlinear viscoelastic constitutive model is proposed to describe the mechanical behavior of a polymer matrix composite (HTPB propellant). The model is built upon two stress-dependent nonlinear functions within the hereditary integral formulation of viscoelasticity. After implementation into a finite element code, the proposed model is utilized to simulate the stress-strain responses of cyclically loaded HTPB propellant. The results show that the model is capable of capturing the main characteristics of the hysteresis loops during fatigue process and good quantitative agreement is found under circumstances that self-heating effect is not evident. This paper deepens the understanding of the nonlinear behaviors of composite propellant under cyclic loading.
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Tong, X., Xu, J., Doghri, I., El Ghezal, M. I., Krairi, A., & Chen, X. (2020). A nonlinear viscoelastic constitutive model for cyclically loaded solid composite propellant. International Journal of Solids and Structures, 198, 126-135. https://doi.org/10.1016/j.ijsolstr.2020.04.011 (Original work published 2020)