Thermodynamic Analysis And Theoretical Study Of Particle Reinforced Composites

The mechanical properties of particle reinforced composites are determined by the properties of the matrix material,particles and the intergranular interfaces.In this subject,a theoretical model of three phase composites,including matrix,inclusion particles and a certain thickness interface layer,is established by using the mesoscopic mechanical method to analyze the influence of the volume fraction of particles,shapes and the thickness of the interface on the thermodynamic properties of the reinforced composites.In this model,it is assumed that the particles are uniformly distributed in matrix and have perfect interface with the matrix material.The reinforced particles,matrix and interface layer are considered as inclusions in the composite material.In this model,the intrinsic strain relationship of thermal expansion between the reinforcing particles and the interface considering the bonding interface between the particle and the matrix is given by means of the Eshelby equivalent inclusion theory and the Mori-Tanaka method,and the analytical formula of the thermal expansion coefficient of the three phase cell element is derived.Based on the specific material parameters,the actual constants of the composite are numerically calculated.The variation of the thermal expansion coefficient curves of the particles with different volume fraction,shapes and thickness of the interface layer is obtained.Combined with the same meso-mechanical method,we further solved the thermal conduction problem of the composite,and analyzed the change trend of the heat conduction coefficient with the influence factors.In the numerical simulation part,the thermal expansion and thermal conductivity of the particle inclusions are predicted through the model formulae deduced in this paper.The results of the model obtained in this study are compared with the results of other existing research data.The feasibility and rationality of the theoretical model proposed have been verified based on the results obtained.