Comparation of Solid Propellant Micromodels with and without Damage at Initial Particle/matrix Interface

doi:10.3969/j.issn.1000-1093.2020.09.012

Abstract

Abstract: Impregnation capability at particle/matrix interface deteriorates during the preparation of composite solid propellant due to manufacturing and environmental factors，which leads to the initial defects in composite solid propellant. In order to analyze how initial defect affects the mechanical property of solid propellant，a microscopic particle packing model is created by applying the molecular dynamics method. An exponential cohesive model for particle/matrix interface is developed by vectorized user defined material subroutine(VUMAT). Moreover，an initial damage model，in which the distribution of density function of bond strength at propellant particle/matrix interface obeys Weibull function，and a damage-free model of particle/matrix interface with the same bond strength are established.Comparison of the numerical results of two models shows that the mesh sensitivity of the initial damage model is lower than that of the damage-free model.In the initial damage model，the smaller the shape parameter is，the higher the damage is，and the lower the initial modulus is. Through experiments and simulations，it could be seen that the initial damage model can be used to describe the damage characteristic more accurately in uniaxial tension compared to the damage-free model.

Key words: solidcompositepropellant, microscopicparticlepackingmodel, exponentialcohesivelaw, Weibulldistribution, meshsensitivity

CLC Number:

V512⁺.3

HOU Yufei， XU Jinsheng， ZHOU Changsheng， CHEN Xiong， LI Hongwen. Comparation of Solid Propellant Micromodels with and without Damage at Initial Particle/matrix Interface[J]. Acta Armamentarii, 2020, 41(9): 1800-1808.

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