Thermal Stress Numerical Simulation Of Complex Components Of SiC Particle Reinforced Ceramic Matrix Composites

Particle reinforced composites are widely used in aerospace and other fields.The prediction of thermal physical properties and mechanical properties of SiC particle reinforced ceramic matrix composites is the basis for optimal design and preparation of such materials.Meanwhile,it provides calculation parameters for thermal stress calculation of spacecraft.At present,SiC particle composite is one of the candidates for thermal structure material of near space vehicle.The thermal stress calculation and high temperature strength analysis of such materials is one of the focuses in aerospace field.In order to solve this problem,the thermal stress of the SiC particle reinforced ceramic matrix composites and the complex components of the composites are numerically simulated in this paper..First,based on meso mechanics,a two-dimensional and three-dimensional mesoscopic structure model of two-dimensional and three-dimensional,multi shape single particle reinforced and dual particle reinforced composites is established based on meso mechanics.Using SiC nano reinforced ceramic matrix composites as an example,on the basis of heat transfer,elastic-plastic mechanics,homogenization method,flight dynamics theory research,using ANSYS software parametric language APDL two development,analysis of the material of 2D and 3D equivalent performance parameters,the equivalent thermal conductivity coefficient,equivalent the material expansion coefficient,equivalent elastic modulus,and put forward the optimization scheme.Secondly,for a near space vehicle during actual flight,especially after a long time flight,the heat caused by temperature stress effect on structure often can not be ignored,when the initial temperature is 300K,height 20km,at a speed of 5 Maher,10 degree angle of attack of the cruise flight conditions,using finite element method the three-dimensional numerical simulation of the stress of the hypersonic aircraft wing multi riveted structure of heat,the stress concentration phenomenon of the riveted joints is more serious.In this paper,through the method of homogenization simulated equivalent material properties,while the actual structure is found in more dangerous areas of stress concentration,to provide guidance for future computational performance of SiC particle reinforced composite material and Simulation of multi riveted complex structure of aircraft.