复合材料点阵夹芯结构的耦合换热及热应力分析  

Coupled heat transfer and thermal stress analysis of composite lattice core sandwich structure

作　　者：吴林志[1] 殷莎[1] 马力[1] 

机构地区：[1]哈尔滨工业大学复合材料与结构研究所,黑龙江哈尔滨150080

出　　处：《功能材料》2010年第6期969-972,共4页Journal of Functional Materials

基　　金：国家重点基础研究发展计划(973计划)资助项目(2006CB601206);国家自然科学基金资助项目(90816024;10872059)

摘　　要：采用数值模拟对复合材料点阵夹芯结构的传导辐射耦合换热及其产生的热应力问题进行了研究。通过孔洞辐射的计算方式,分析了结构内部辐射对于传热机制的影响,并探讨了纤维柱及材料发射率等因素对辐射换热强弱的影响;最后,分析了结构在耦合换热作用下所产生的热变形和热应力。数值结果表明,当温度在350℃左右时,碳纤维点阵夹芯结构的辐射换热效果明显,且温度越高其差值越大;纤维柱对辐射换热的贡献不大;材料的表面发射率越大,夹芯结构的辐射换热能力越强。在上下面板固支情况下,热应力场主要分布于上面板及纤维柱与上面板相接触的根部,增强辐射换热,可减小根部的最大热应力。A simulation was carried out for the coupled conduction and radiation heat transfer in the all-composite lattice core sandwich structure.The cavity radiation method was used firstly to detect the radiation contribution to the heat transfer,and then a discussion for the effect factors of this contribution was followed,such as the participation of the lattice truss core and the surface emissivity of the composite materials.Finally,the thermal deformation and thermal stress was calculated on the basis of the known temperature field by coupled simulation.It was shown that the radiation effect was obvious when the structural temperature was around 350℃,and this effect was enhanced as the emissivity increased;the contribution of lattice truss core to the heat radiation was small.As the upper and under sheets fixed,thermal stress happened mainly in the upper facesheet and at the endwalls where the cylinders contacted with the upper facesheet.The distribution of thermal stress field depends on the restriction forms,and the max thermal stress is smallest only as the upper sheet is fixed.

关 键 词：复合材料点阵夹芯 传导辐射耦合换热 孔洞辐射 发射率 热应力 

分 类 号：V414.8[航空宇航科学与技术—航空宇航推进理论与工程]