用轮廓离散法研究粗糙表面间的接触导热

通过ＳＴＡＲ－１型表面轮廓仪对粗糙表面实际形貌的测定，分析得到了实际表面微凸体的高度分布和曲率分布，发现微凸体的高度分布并非高斯，而曲率分布则呈随机状态，运用轮廓离散的广泛和显微硬度的概念，得到了各高度下微凸体的数量和实际形变，建立了粗糙表面接触热导的离散化模型，该模型消降了常规模型中有关微凸体高度分布和形变类型的人为假设。模型与实验数据吻合程度良好，其预测精度比Ｇ－Ｗ模型和Ｙ模型高。

USING PROFILE DISCRETIZATION METHOD TO INVESTIGATE THERMAL CONTACT CONDUCTANCE BETWEEN ROUGH INTERFACES

Surface roughness parameters were measured using STAR-1 profilometer.The results showed that the distribution of the peak height was different from the profile height distribution and was not Gaussian, but the curvature distribution was random. A model was developed which used a discretiza- tion method to obtain the asperity height and deformation mode.This model eliminated some of the assumptions made by previous models and can be used to predict the thermal contact conductance without assuming the asperity deformation mode and surface summit height distribution.The predicted thermal contact conductance values were in good agreement with experimental results.