| Citation: | TIAN Xueliang, XU Ying, WANG Xuemin, et al. Analysis of mechanical properties of SiCp/Al composites based on three-dimensional random meso-model[J]. Journal of Aerospace Power, 2024, 39（6）：20210687 doi: 10.13224/j.cnki.jasp.20210687
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Based on the mesoscopic composition and structural characteristics of particle reinforced aluminum matrix composites, a three-dimensional random meso particle reinforced composites analysis model and method considering particle, matrix and interface properties are established. On the meso scale, cubic particle, spherical particle and three-dimensional random polyhedron models are used to characterize the shape of particles respectively. According to the particle size distribution data obtained from particle raw material particle size analysis, a three-dimensional random representative volume element considering the random characteristics of particle spatial distribution and the probability distribution characteristics of particle size is established. Based on Ludwik model, considering the quenching hardening effect, the elastic-plastic constitutive relationship of aluminum matrix is described. The ductile damage of matrix, the elastic-brittle failure of SiC particles and the tensile cracking behavior of interface are considered. The deformation and damage process of material in uniaxial tension are simulated. The uniaxial tensile test verification of SiCp/Al2009 composite standard parts is carried out. The results show that the maximum errors of elastic modulus, yield strength and tensile strength are less than 5%, 5% and 11% respectively; The prediction result of elastic modulus is less affected by particle shape; Among them, the three-dimensional random polyhedron model has the highest prediction accuracy of tensile strength, and can reflect the failure modes of matrix ductile fracture, particle brittle failure and interface debonding in the tensile fracture process of particle reinforced composites; The model and method can provide a useful reference for the analysis of meso damage mechanism and macro mechanical properties of particle reinforced aluminum matrix composites.
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