| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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A measurement method for distinguishing the real contact area of rough surfaces of transparent solids using improved Otsu technique |
| Song Bao-Jiang (宋保江), Yan Shao-Ze (阎绍泽), Xiang Wu-Wei-Kai (向吴维凯) |
| State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China |
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Abstract An experimental method of measuring the real contact area of transparent blocks based on the principle of total internal reflection is presented, intending to support the investigation of friction characteristics, heat conduction, and energy dissipation at the contact interface. A laser sheet illuminates the contact interface, and the transmitted laser sheet is projected onto a screen. Then the contact information is acquired from the screen by a camera. An improved Otsu method is proposed to process the data of experimental images. It can compute the threshold of the overall image and filter out all the pixels one by one. Through analyzing the experimental results, we describe the relationship between the real contact area and the positive pressure during a continuous loading process, at different loading rates, with the polymethyl methacrylate (PMMA) material. A hysteresis phenomenon in the relationship between the real contact area and the positive pressure is found and explained.
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Received: 11 April 2014
Revised: 02 July 2014
Accepted manuscript online:
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PACS:
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46.55.+d
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(Tribology and mechanical contacts)
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42.30.Va
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(Image forming and processing)
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78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11272171), the Beijing Natural Science Foundation, China (Grant No. 3132030), and the Education Ministry Doctoral Fund of China (Grant No. 20120002110070). |
Corresponding Authors:
Yan Shao-Ze
E-mail: yansz@mail.tsinghua.edu.cn
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Cite this article:
Song Bao-Jiang (宋保江), Yan Shao-Ze (阎绍泽), Xiang Wu-Wei-Kai (向吴维凯) A measurement method for distinguishing the real contact area of rough surfaces of transparent solids using improved Otsu technique 2015 Chin. Phys. B 24 014601
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