随机粗糙峰接触模型的等效热阻研究
首发时间:2015-06-01
摘要:接触表面的接触热阻受接触面上粗糙峰的面积比、分布、几何尺寸等多种因素的影响。本文首先基于多点接触理论,通过控制粗糙峰的面积比,引入粗糙峰空间位置和几何尺寸的随机分布函数,建立了用于计算随机接触表面等效接触热阻的代表性体积单元。随后,本文对该代表性体积单元的粗糙峰的不同空间位置随机分布对代表性体积单元计算结果的稳定性进行了研究,研究表明选取的代表性体积单元可以保证预测的结果不受粗糙峰的空间随机分布的影响,即可以保证代表性单元的有效性。以上述研究为基础,本文最后重点研究了不同特征尺寸、接触面积比、粗糙峰高度、材料导热系数等因素对接触热阻的影响。
关键词: 代表性体积单元 随机分布 等效接触热阻 接触面积比。
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The research of quivalent thermal resistance between solids with randomly contact roughness peak
Abstract:Thermal contact resistance of contact interface affected by area rito, distribution , geometric dimension of roughness peak. This article based on the theory of multi-point contact, by controlling the asperity area ratio, introducting function of distribution and geometric dimension of roughness peak, establishing representative volume model for calculating equivalent thermal contact resistance of contact interface. Then, this article have a research on stability of result of different distribution of roughness peak by the representative volume model, result shows this representative volume model can guarantee the TCR do not affected by distribution of roughness peak, means the effectiveness of the representative volume model. Based on this reaearch, this article focus on the study of feature size of roughness peak, contact area rate, rough peak height, material thermal conductivity impact on thermal contact resistance.
Keywords: representative volume element model random distribution equivalent thermal contact resistance contact area ratio.
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