To study the evolution of asperity contact in the sliding contact, a new in situ observation system of sheet metal surface is built up. The workpiece is stationary so that the continuous deformation of a specific group of asperities can be traced. In the case of no strain rate in the substrate of workpiece, the experiments for various materials, roughness patterns, sliding velocities, and normal loads all show that the fractional contact area will increase from its initial state of pure flattening without shear stress, to a saturated value with sliding distance in different rates. The sliding velocity has minor influence on the variation of contact area for same sliding distance. The maximum increasing rate of the contact area is found in the case of medium load. In most cases, the increase in contact area takes place with simultaneously decreasing shear stress and pressure on the flattened asperity peak. The development of adhesive wear can be clearly observed in the case of high normal load and long sliding distance.
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April 2002
Technical Papers
Real-Time Observation of the Evolution of Contact Area Under Boundary Lubrication in Sliding Contact
Sy-Wei Lo, Professor,
Sy-Wei Lo, Professor
Department of Mechanical Engineering, National Yunlin University of Science and Technology, Touliu, Taiwan 640
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Sheng-Da Tsai, Graduate Assistant
Sheng-Da Tsai, Graduate Assistant
Department of Mechanical Engineering, National Yunlin University of Science and Technology, Touliu, Taiwan 640
Search for other works by this author on:
Sy-Wei Lo, Professor
Department of Mechanical Engineering, National Yunlin University of Science and Technology, Touliu, Taiwan 640
Sheng-Da Tsai, Graduate Assistant
Department of Mechanical Engineering, National Yunlin University of Science and Technology, Touliu, Taiwan 640
Contributed by the Tribology Division for publication in the ASME JOURNAL OF TRIBOLOGY. Manuscript received by the Tribology Division September 19, 2000; revised manuscript received January 23, 2001. Associate Editor: J. A. Williams.
J. Tribol. Apr 2002, 124(2): 229-238 (10 pages)
Published Online: January 23, 2001
Article history
Received:
September 19, 2000
Revised:
January 23, 2001
Citation
Lo, S., and Tsai, S. (January 23, 2001). "Real-Time Observation of the Evolution of Contact Area Under Boundary Lubrication in Sliding Contact ." ASME. J. Tribol. April 2002; 124(2): 229–238. https://doi.org/10.1115/1.1387027
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