热力耦合作用下薄壁均热板的力学特性分析  

Research on Mechanical Properties of Vapor Chamber under Thermo-mechanical Coupling Effect

作　　者：蔡爱峰 钱程[1] 朱娟 聂晓展 程鑫 杨光[1] 吴静怡[1] CAI Aifeng;QIAN Cheng;ZHU Juan;NIE Xiaozhan;CHENG Xin;YANG Guang;WU Jingyi(Institute of Refrigeration and Cryogenics,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学制冷与低温工程研究所,上海200240

出　　处：《真空与低温》2024年第2期157-165,共9页Vacuum and Cryogenics

基　　金：国家自然科学基金重点项目(51936006);上海市自然科学基金(22ZR1434300)。

摘　　要：随着航天技术的快速发展,高功耗、大尺寸电子元件的散热问题亟待解决。基于被动式两相热输运机理的大面积薄壁均热板提供了一种有前景的高效散热选择,同时大面积、薄壁的结构特点也为其流-热-力耦合设计带来了一系列挑战。基于弹性力学理论与有限元分析方法,分析了承力单元各结构参数的力学构效关系,并研究了在不同压力场、温度场、热-力耦合场下腔体应力的变化规律。仿真结果表明,承力单元最大应力与孔隙率、承力柱直径呈指数关系。当只考虑腔体内部温度场时,腔体热应力与承力柱直径正相关,与孔隙率和板厚负相关。温度场和压力场在承力结构的不同部位会导致不同的拉、压应力效果,腔体的表观最大应力受到温度场与压力场两种作用相互叠加或抵消的影响。With the rapid development of aerospace technology,the heat dissipation requirements of high-power consumption and large size electronic components need to be solved urgently.The large-area thin-walled vapor chamber based on the passive two-phase heat transport mechanism provides a promising choice for efficient heat dissipation.At the same time,the structural characteristics of large-area and thin-walled cavity also bring a series of challenges to its flow heat force coupling design.Therefore,based on Finite Element Analysis(FEA)and the theory of elasticity,this study elucidates the mechanical constitutive relationship of each structural parameter of the load-bearing unit,and reveals the changing law of the cavity stress under the pressure field,temperature field,and thermo-mechanical coupling field:The maximum stress in the bearing unit is exponentially related to the porosity and the bearing column diameter.When only the internal temperature field of the cavity is considered,the thermal stress in the cavity is positively related to the bearing column diameter and negatively related to the porosity and the thickness of the vapor chamber.The temperature and pressure fields have different tensile and compressive stress effects on different parts of the loading structure,and the apparent maximum stress in the cavity is actually the result of the two stresses superimposing or cancelling each other.

关 键 词：大面积均热板 代表体元法 力学特性 构效关系 

分 类 号：TB69[一般工业技术—制冷工程] O343.6[理学—固体力学]