A solid rocket motor is one of the critical components of solid missiles, and its life and reliability mostly depend on the mechanical\nbehavior of a composite solid propellant (CSP). Effective mechanical properties are critical material constants to analyze the\nstructural integrity of propellant grain. They are estimated by a numerical method that combines the Voronoi cell finite element\nmethod (VCFEM) and the homogenization method in the present paper. The correctness of this combined method has been\nvalidated by comparing with a standard finite element method and conventional theoretical models. The effective modulus and\nthe effective Poisson�s ratio of a CSP varying with volume fraction and component material properties are estimated. The result\nindicates that the variations of the volume fraction of inclusions and the properties of the matrix have obvious influences on the\neffective mechanical properties of a CSP. The microscopic numerical analysis method proposed in this paper can also be used to\nprovide references for the design and the analysis of other large volume fraction composite materials.
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