中国物理B ›› 2015, Vol. 24 ›› Issue (1): 14601-014601.doi: 10.1088/1674-1056/24/1/014601
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
宋保江, 阎绍泽, 向吴维凯
Song Bao-Jiang (宋保江), Yan Shao-Ze (阎绍泽), Xiang Wu-Wei-Kai (向吴维凯)
摘要:
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.
中图分类号: (Tribology and mechanical contacts)