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Strength of Materials

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13-11-2021 | SCIENTIFIC AND TECHNICAL SECTION

Prediction Method of Heterogeneous Propellant Relaxation Moduli Based on Viscoelastic VCFEM

Authors: L. L. Shen, Z. B. Shen, L. Zhang, H. Y. Li

Published in: Strength of Materials | Issue 4/2021

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Abstract

The relaxation modulus of heterogeneous propellants permits evaluating the structural integrity and life of a solid rocket motor. Its governing factors were investigated by the Voronoi cell finite element method (VCFEM) at the microscopic level. The formula of viscoelastic VCFEM is based on the discrete form of the Prony series viscoelastic constitutive model in the time domain; the iterative procedure is also proposed to obtain the effective modulus at each time step. The random sampling method is adopted to analyze the effect of each microparameter on the effective relaxation modulus. The results show that the matrix modulus and inclusion weight fraction exert a more pronounced effect on the relaxation modulus than the inclusion material constants and particle grain.

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L. L. Shen, Z. B. Shen, and Y. Xie, “Effective mechanical property estimation of composite solid propellants based on VCFEM,” Int. J. Aerospace Eng., 2018, 2050876 (2018), https://doi.org/10.1155/2018/2050876.CrossRef

Title: Prediction Method of Heterogeneous Propellant Relaxation Moduli Based on Viscoelastic VCFEM
Authors: L. L. Shen
Z. B. Shen
L. Zhang
H. Y. Li
Publication date: 13-11-2021
Publisher: Springer US
Published in: Strength of Materials / Issue 4/2021
Print ISSN: 0039-2316
Electronic ISSN: 1573-9325
DOI: https://doi.org/10.1007/s11223-021-00314-x

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