Analysis of mechanical properties of SiCp/Al composites based on three-dimensional random meso-model
Based on the mesoscopic composition and structural characteristics of particle reinforced aluminum matrix composites,a three-dimensional random meso particle reinforced composites analysis model along with its method considering particle,matrix and interface properties was established.On the meso scale,cubic particle,spherical particle and three-dimensional random polyhedron models were 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 was established.Based on Ludwik model,considering the quenching hardening effect,the elastic-plastic constitutive relationship of aluminum matrix was described.The ductile damage of matrix,the elastic-brittle failure of SiC particles and the tensile cracking behavior of interface were considered.The deformation and damage process of material in uniaxial tension were simulated.The uniaxial tensile test verification of SiCp/Al2009 composite standard parts was carried out.The results showed that the maximum errors of elastic modulus,yield strength and tensile strength were less than 5％,5％and 11％,respectively;the prediction result of elastic modulus was less affected by particle shape;among them,the three-dimensional random polyhedron model had 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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