The Research On Effect Of Reinforcement Particle Characteristics On The Mechanical Properties Of SiCp/Al Composite Materials

As an advanced composite material,SiCp/Al composite material had high specific strength and specific modulus,fatigue resistance,high dimensional stability and had been widely used in the fields of aerospace,automobile manufacturing and electronic packaging.In this paper,we mainly studied the effect of reinforcement particle characteristic parameters on the mechanical properties of composite materials to establish the relationship between the macro-and micro-mechanical properties of SiCp/Al composites.On the basis of the quantitative characterization of the particle characteristics,the influence of the particle characteristic parameters on the mechanical properties of the composites was analyzed,and further established the coupling model of mechanical properties of composite materials.The main research contents and results of this paper are as follows:The corresponding stress-strain curves were obtained by analyzing the nanoindentation curves at different locations,and finally the mechanical properties required for numerical simulation and the stress-strain relationship at the plastic stage are obtained.The analysis of the interface position showed that the average of Young's modulus is 187.299GPa,the average of yield stress is 0.336GPa,and the stress-strain relationship at the interface stage is?=0.336×?1+557.438·?_p?^0.376.The analysis of the matrix position showed that the average of Young's modulus is 121.015GPa and the average of yield stress is 0.120GPa;the stress-strain relationship of the matrix part is?=0.120×?1+1011.269·?_p?^0.410.According to the established finite element analysis model of composite materials with different particle characteristic parameters?equivalent diameter,shape factor,and uniformity index?,it was found that the yield stress and the Young's modulus of the composite materials increased first and then dropped with the decrease of the equivalent diameter,and increased with the increase of the shape factor,while the change trend of the yield stress and the Young's modulus under different uniformity index was opposite.The ratio of the average stress of the composite materials to the average stress of the matrix in all three cases was greater than 1,indicating that the reinforcing particles have a certain strengthening effect on the matrix.The ratio of the average plastic strain of the composite material to the average plastic strain of the matrix was less than 1,indicating that the average plastic deformation at the interface was smaller than that of the matrix.Finally,the quantitative relationships between the Young's modulus,the yield stress and equivalent diameter,shape factor,uniformity index were established using the Logistic function,Binomial formula,and Gauss formula,respectively.The coupling model between the Young's modulus,the yield stress of the composite material and the characteristic parameters of the three types of reinforcement particles were established by Multivariate Linear Regression.The coupled model was tested and the results showed that the Young's modulus and the yield stress had the linear relationship between the quantitative relationships of the three kinds of reinforcement particle characteristic parameters,and finally proved the accurate prediction of the two coupled models.