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TECHNICAL PAPERS

Modeling of Micro-Pit Evolution in Rolling or Strip-Drawing

[+] Author and Article Information
M. P. F. Sutcliffe, H. R. Le, R. Ahmed

Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK

J. Tribol 123(4), 791-798 (Dec 07, 2000) (8 pages) doi:10.1115/1.1352741 History: Received June 22, 2000; Revised December 07, 2000
Copyright © 2001 by ASME
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References

Figures

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Comparison between measurements and theory for the change in the pit area of shot-blasted white hot band during drawing
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Schematic of inlet and MPHL lubrication mechanism
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A schematic of the artificial micro-pits. Dimensions are in mm.
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Comparison between measurements and theory for the change in the volume of the artificial micro-pits during drawing
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Schematic of flattening of an asperity: (a) initial asperity; (b) comparison between deformed and initial asperity, after Lo and Wilson 13.
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Schematic of micro-pit evolution due to sliding in the bite: (a) isolated micro-pits under uniform contact pressure; (b) oil drawn out by sliding, after Lo and Wilson 13.
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Schematic of strip forming processes (a) rolling and (b) drawing
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Theoretical predictions for the variation in trailing edge film thickness h1 and contact area ratio A through the bite in rolling, Y=600 MPa,A0=0.5, and L0=300 μm
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Theoretical predictions for the variation in trailing edge MPHL film thickness h1 and contact area ratio A through the bite in strip drawing, Y=600 MPa,A0=0.5, and L0=300 μm
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Correlation between the full numerical prediction and the estimated value from Eq. (18) of the ratio h1/δ of the trailing edge film thickness to the pit depth
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Variation of contact ratio with Λm

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