Study On Stress Distribution In Near Shell Microregion Of Core-shell Particle Reinforced Al Matrix Composites During The Deformation Process

The interface is an important part of the metal matrix composite material,which determines the mechanical properties and deformation behavior of the composite material.The study of the stress distribution of the micro-regions near the interface layer in the process of composite materials is helpful to better understand the influence of the interface on the deformation behavior of the composite materials.Based on the experimental results,a series of core-shell structure particle reinforced aluminum matrix composite materials models were constructed with Si C,diamond and graphite as the main reinforcement phases.The influence of shell properties and thickness changes on the stress distribution of the micro-region near the shell during the deformation of the composite material was studied by finite element method.First,the paper analyzes the stress cloud of the core and matrix of the particle-reinforced aluminum matrix composites with different core-shell structures,and finds that the impact of the shell on the stress distribution during the deformation of the particle-reinforced metal matrix composite depends on Modulus of elasticity of shells and cores and their differences.Secondly,the study found that changes in the shell properties will significantly affect the distribution of the maximum stress position on the reinforced particles,but have little effect on the maximum stress position on the substrate near the shell micro-area.The research on the standard deviation of stress in each part of the model shows that the existence of the shell layer will affect the concentration of stress in each part of the model.The smaller the elastic modulus of the core,the more serious the stress concentration in the matrix.Finally,the effect of shell thickness variation on stress distribution is analyzed.It is found that,under the condition that the size of the reinforcing phase particles is fixed,the influence of the thickness of the shell layer on the stress concentration of the aluminum matrix also mainly depends on the elastic modulus of the shell and the core.When the elastic modulus of the shell layer is less than the elastic modulus of the core,the increase in the thickness of the shell layer will reduce the degree of stress concentration of the matrix,otherwise,the increase in the thickness of the shell layer will increase the degree of stress concentration of the matrix.While keeping the core size constant,an increase in the thickness of the shell will reduce the stress concentration of the shell,but increase the stress concentration of the matrix.