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基于原位观测的固体表面真实接触面积计算
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国家自然科学基金项目(51375132);中北大学科学研究基金项目(XJJ2016004)


Real Contact Area Calculation of the Solid Surface Based on the In Situ Observation
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    摘要:

    为获得固体粗糙表面实际接触面积和表面形貌,设计一个能够原位光学观测和分析固体粗糙接触界面名义接触区域和实际接触区域的测量装置。采用该测量装置获得不同直径金属小球与玻璃平板在不同载荷作用下的接触图像,采用Canny算子等图像处理方法对金属小球与玻璃平板相互接触产生的牛顿环进行边缘提取和灰度阈值分析,获得接触界面名义接触面积和实际接触面积随小球直径和载荷的变化规律。实验结果表明:粗糙接触界面的名义接触面积随载荷的增加而增加;实际接触面积与名义接触面积之比随载荷和小球直径的增加而非线性增加;在塑性变形阶段,直径较小的金属小球名义接触面积随载荷变化较为敏感,而在弹性变形阶段,则直径较大小球变化剧烈,与Hertz接触理论相符合。该实验装置还可进行接触界面的摩擦学特性分析,如表面形貌、边界膜厚度和磨粒构造等。

    Abstract:

    In order to obtain the actual contact area and surface morphology of solid rough surface,a measuring device was designed to observe and analyze the nominal contact area and actual contact area of contact interface.The contact images of metal balls and glass plates with different diameters under different loads were obtained by using this measuring device.The edge extraction and gray threshold analysis of contact Newton’s ring were carried out by using Canny image processing method.The change of nominal contact area and actual contact area of the contact interface with the diameter of the ball and load was obtained.The experimental results indicate that the nominal contact area of rough interface is increased with the increase of load.The ratio of the actual contact area to the nominal contact area is also increased nonlinearly with the increase of the load and the diameter of the ball.At the stage of plastic deformation,the nominal contact area of small diameter metal ball is sensitive to the change of load,however,at the elastic deformation stage,the nominal contact area of larger diameter metal ball changes dramatically.The experiment results are in accordance with the Hertz contact theory.The measuring device can also be used to study the tribological properties of the contact interface,such as surface morphology,boundary film thickness,wear debris formation and so on.

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董磊.基于原位观测的固体表面真实接触面积计算[J].润滑与密封,2018,43(9):76-80.
. Real Contact Area Calculation of the Solid Surface Based on the In Situ Observation[J]. Lubrication Engineering,2018,43(9):76-80.

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  • 在线发布日期: 2018-09-26
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