Experimental investigation of junction growth of rough contacts using X-ray computed tomography

IF 6.3 1区 工程技术 Q1 ENGINEERING, MECHANICAL Friction Pub Date : 2024-08-06 DOI:10.1007/s40544-024-0896-1
Runliang Wang, Jianhua Liu, Bo Liu, Duo Jia, Xiaoyu Ding
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Abstract

The real contact area (RCA) of randomly rough contacts has received a great deal of attention because it correlates strongly with friction, lubrication, sealing, and conductivity. Simulations have revealed that the RCA associated with deterministic normal squeezing loads increases when tangential loads are also applied, in a phenomenon called junction growth. However, experimental investigations of the junction growth of randomly rough contacts are rare. Here, we used X-ray computed tomography (CT) to measure junction growth when two aluminum alloy surfaces were in contact. A high-resolution experimental setup was used to apply loads and observe contact behaviors at a resolution of 4 µm. The RCA and average contact gaps were computed using a three-dimensional (3D) geometric model constructed from gray CT images using the Otsu thresholding method. The results showed that the RCA increased as the normal load increased. The RCA increased by 22.67% after a tangential load was applied (junction growth), and the average gap decreased by 14.01% after a tangential load was applied. Thus, X-ray CT accurately measured the junction growth as a novel quantitative method.

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利用 X 射线计算机断层扫描对粗糙触点的结生长进行实验研究
随机粗糙触点的实际接触面积 (RCA) 与摩擦、润滑、密封和导电性密切相关,因此受到广泛关注。模拟显示,当同时施加切向载荷时,与确定性法向挤压载荷相关的 RCA 会增大,这种现象被称为 "结点增长"。然而,对随机粗糙触点的结生长进行的实验研究却很少见。在这里,我们使用 X 射线计算机断层扫描(CT)来测量两个铝合金表面接触时的结生长。我们使用高分辨率实验装置施加负载,并以 4 µm 的分辨率观察接触行为。利用大津阈值法从灰色 CT 图像中构建的三维(3D)几何模型计算了 RCA 和平均接触间隙。结果表明,随着法向载荷的增加,RCA 也在增加。在施加切向载荷后,RCA 增加了 22.67%(交界增长),而在施加切向载荷后,平均间隙减少了 14.01%。因此,X 射线 CT 作为一种新的定量方法准确测量了交界处的生长。
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来源期刊
Friction
Friction Engineering-Mechanical Engineering
CiteScore
12.90
自引率
13.20%
发文量
324
审稿时长
13 weeks
期刊介绍: Friction is a peer-reviewed international journal for the publication of theoretical and experimental research works related to the friction, lubrication and wear. Original, high quality research papers and review articles on all aspects of tribology are welcome, including, but are not limited to, a variety of topics, such as: Friction: Origin of friction, Friction theories, New phenomena of friction, Nano-friction, Ultra-low friction, Molecular friction, Ultra-high friction, Friction at high speed, Friction at high temperature or low temperature, Friction at solid/liquid interfaces, Bio-friction, Adhesion, etc. Lubrication: Superlubricity, Green lubricants, Nano-lubrication, Boundary lubrication, Thin film lubrication, Elastohydrodynamic lubrication, Mixed lubrication, New lubricants, New additives, Gas lubrication, Solid lubrication, etc. Wear: Wear materials, Wear mechanism, Wear models, Wear in severe conditions, Wear measurement, Wear monitoring, etc. Surface Engineering: Surface texturing, Molecular films, Surface coatings, Surface modification, Bionic surfaces, etc. Basic Sciences: Tribology system, Principles of tribology, Thermodynamics of tribo-systems, Micro-fluidics, Thermal stability of tribo-systems, etc. Friction is an open access journal. It is published quarterly by Tsinghua University Press and Springer, and sponsored by the State Key Laboratory of Tribology (TsinghuaUniversity) and the Tribology Institute of Chinese Mechanical Engineering Society.
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