Surface Fatigue Lives of Case-Carburized Gears With an Improved Surface Finish

[+] Author and Article Information
T. L. Krantz

U.S. Army Research Laboratory, Glenn Research Center, Cleveland, OH 44135

M. P. Alanou, H. P. Evans, R. W. Snidle

Cardiff University, P.O. Box 685, Cardiff, CF24 3TA, Wales, United Kingdom

J. Tribol 123(4), 709-716 (Jan 18, 2001) (8 pages) doi:10.1115/1.1387036 History: Received February 02, 2000; Revised January 18, 2001
Copyright © 2001 by ASME
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NASA Glenn Research Center gear fatigue test apparatus: (a) cutaway view; (b) schematic view.
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Microphotographs of the gears prepared with 3 percent nital etch: (a) core of superfinished gear; (b) case of superfinished gear; (c) core of ground gear (from Ref. 4); and (d) case of ground gear (from Ref. 4).
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Material hardness versus depth below the pitch radius surface: (a) superfinished gear; (b) ground gear.
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Near-mirror quality of superfinished tooth surface
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Typical relocated surface features measured using a profilometer followed by filtering of the data using a 0.08 mm (0.003 in.) cutoff. Evidence of persistence of the deepest grinding marks are indicated by arrows: (a) ground tooth surface, Ra=0.434 μm (17 μin.) (b) same tooth surface after the first stage of superfinishing, Ra=0.083 μm (3.3 μin.); (c) same tooth after second (final) stage of superfinishing, Ra=0.056 μm (2.23 μin.).
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Comparison of gear tooth surface topographies as measured using a mapping interferometric microscope: (a) ground gear tooth; (b) superfinished gear tooth.
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Typical fatigue damage: (a) ground gear from study of Ref. 4; (b) superfinished gear of present study.
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Surface fatigue lives of ground and superfinished AISI 9310 gear pairs: (a) ground gears of Ref. 4; (b) superfinished gears; (c) summary of linear least-square fit lines; and (d) linear least-squares-fit lines plotted on linear axes.



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