Study On Thermal And Mechanical Properties Of Composite Materials Based On Finite Element Method

The mechanical and thermal properties of composite materials have an important influence on the application of materials.This thesis established three composite materials of diamond/copper,chopped carbon fiber/epoxy resin,carbon fiber cloth/epoxy resin using finite element method,and explored the influence of system factors on the thermal and mechanical properties of composite materials.The effect of interfacial modification,particle size ratio(r),and diamond volume fraction(?)on the thermal conductivity of diamond/copper composites was studied using double-diameter diamond mixed reinforced copper matrix.The changes of thermal conductivity,thermal expansion coefficient and Young's modulus of the composite materials were observed.In order to reduce the production and application costs of carbon fiber/epoxy resin matrix composites,the composite system of chopped carbon fiber and epoxy resin was studied using simulation technology.By controlling the orientation distribution of chopped carbon fibers,we simulated the carbon fiber in epoxy resin matrix structure and staggered structure two states,studied the mechanical and thermal properties of the composite material.The study found that the composite material with carbon fiber tile structure shows anisotropic characteristics,and the composite material with staggered structure has isotropic characteristics in the plane.In the carbon fiber cloth/epoxy composite system,we studied the influence of yarn width and porosity on the thermal conductivity,Young's modulus,thermal expansion coefficient,shear modulus and Poisson's ratio of the composite.Our finite element research can be used for experimental research to design new composite materials.