| Syntactic foam(Syntactic Foam)is a class of polymer matrix and hollow microsphere filler mixing,forming,curing the porous material.Compared with the traditional foam,since the material is present in the pores closed hollow microspheres,and therefore it has a low density,high specific strength and stiffness,low water absorption,good thermal insulation properties,electrical insulation properties,acoustic and mechanical damping performance characteristics,widely used in aviation and aerospace,damping plate,deep-sea buoyancy materials,offshore operations,the sandwich structure and electronic industries.By ANSYS APDL language comes second development,the establishment of multi particles randomly distributed volume element model,implementation hollow glass microspheres in a resin matrix with randomly distributed RSA algorithm program.Finite element analysis of the volume element numerical simulation model to study the volume fraction of the filler,the wall thickness of the microspheres,the microspheres equivalent diameter influence the thermal conductivity of the composite material,the material by viewing the local temperature and heat flux vector contours specific Effects of microstructure on the mechanism of thermal performance,enabling optimized design of composite foam.And introducing classical theory model,verify the feasibility and accuracy of the finite element method,and further enrich the finite element analysis method in engineering.Synthesis of the data,draw conclusions about:(1)Through finite element analysis software ANSYS,APDL programming language secondary development,the establishment of hollow glass microspheres filled epoxy matrix random distribution model,the volume element thought to simulate composite materials,composite foam is heat-related It means effective performance.(2)Hollow glass microspheres in a syntactic foam system to heat a certain barrier effect,when the heat encountered hollow glass microspheres,micro heat flow was split on both sides of the ball,only a small part of the heat flow through the hollow glass microspheres,while most of the other along the wall microspheres flow,so that the composite foam can be used as an effective insulation.(3)By the finite element method of effective thermal conductivity of the composite foam to simulate a detailed study of the hollow filler volume fraction,the impact of hollow glass microsphere size and the wall thickness of the thermal properties of the composite foam glass microspheres.With the increase of hollow glass microspheres filled amount of material thermal conductivity substantially linear downward trend,while in the same amount of hollow glass microspheres filled condition,with the microsphere size increases,decreasing the number of microspheres,syntactic foam plastic effective thermal conductivity increases when constant diameter microspheres,hollow glass microspheres with a diameter ratio increases,that is,the thinner wall thickness,material thermal conductivity decreases.(4)From the perspective of anti-insulation effect,according to the simulation results,to ensure the effective dispersion of the situation as much filled microspheres,and use smaller diameter,thin-walled microsphere ball.However,the actual engineering need to consider many factors mechanical properties of materials and the like.(5)The introduction of the classic model and verified by the experimental data,compared with the classical model,finite element analysis model data more fitting experimental data more accurately simulate syntactic foam equivalent thermal conductivity of the actual situation,but also for prediction thermal properties of composite materials and other system parameters to provide a more accurate and effective way. |
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