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TECHNICAL PAPERS

Real-Time Observation of the Evolution of Contact Area Under Boundary Lubrication in Sliding Contact

[+] Author and Article Information
Sy-Wei Lo, Sheng-Da Tsai

Department of Mechanical Engineering, National Yunlin University of Science and Technology, Touliu, Taiwan 640

J. Tribol 124(2), 229-238 (Jan 23, 2001) (10 pages) doi:10.1115/1.1387027 History: Received September 19, 2000; Revised January 23, 2001
Copyright © 2002 by ASME
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References

Figures

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Aluminum sheet with longitudinal roughness: CP diagram; friction force versus sliding distance: fractional contact area versus sliding distance  
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Aluminum sheet with transverse roughness: CP diagram; friction force versus sliding distance; fractional contact area versus sliding distance
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Copper sheet with longitudinal roughness: CP diagram; friction force versus sliding distance; fractional contact area versus sliding distance
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Copper sheet with transverse roughness: CP diagram; friction force versus sliding distance; fractional contact area versus sliding distance
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Relationship between the final junction growth coefficient and the nondimensional mean interface pressure. Material: A=aluminum,B=copper; Roughness: I=isotropic,L=longitudinal,T=transverse; Numbers 10, 60, and 300 represents velocity in mm/min respectively.
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Aluminum sheet with isotropic roughness: CP diagram; Friction force versus sliding distance; fractional contact area versus sliding distance  
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Scratch and adhesive wear for transverse aluminum sheet
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Variation of the contact part (white) and valley (shaded)
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Microscopic image for aluminum with transverse roughness  
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Microscopic image for aluminum with longitudinal roughness    
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Microscopic image for aluminum with isotropic roughness
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Comparison between the measured fractional contact area and the theoretical result of Wilson and Sheu’s model 10 in a stationary flattening test. Aluminum sheet with isotropic roughness is used. The flow stress used in the theory is the initial yield stress multiplied by a factor 1.7.
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Schematic representation of the experimental apparatus and some details of the geometry of workpiece supporter  

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