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Experiments on the High-Power and High-Temperature Performance of Gear Contacts

Olson, Garrett Weston
http://rave.ohiolink.edu/etdc/view?acc_num=osu1340732447

Abstract Details

2012, Master of Science, Ohio State University, Mechanical Engineering.
In this study, gear contact tests were performed using a recently developed test methodology capable of both high-power (pitch-line velocities up to 50 m/s and pinion torques up to 450 N-m) and high-temperature (oil inlet temperatures up to 150C) operating conditions. Test specimens and operating conditions were chosen in order to simulate high-power automotive and aerospace applications. Automotive test specimens were made from a typical automotive transmission gear steel, SAE 4118M, at surface roughnesses typical of hard ground gears. Aerospace test specimens were made out of a high performance (high-temperature) proprietary gear steel. These aerospace specimens were either chemically polished or super-finished following grinding to achieve roughness amplitudes more than 10 times smoother than typical ground surfaces. Throughout each test interim inspections were used to identify and monitor failure modes. Experimental testing for automotive applications is shown to consistently produce contact fatigue failures in the form of micro-pitting and macro-pitting. Tests were suspended when macro-pits exceeded the test methodologies pre-determined failure criteria. Experimental testing for aerospace applications is shown to be absent of any contact fatigue failures due to the extremely smooth contact surfaces. The primary mode of contact failure in aerospace tests is observed to be scuffing.
Ahmet Kahraman (Advisor)
Gary Kinzel (Committee Member)
124 p.
Aerospace Engineering; Aerospace Materials; Automotive Engineering; Automotive Materials; Engineering; Mechanical Engineering
gears; gear contacts; high-power; high-temperature; contact fatigue; pitting; scuffing

Recommended Citations

Citations

  • Olson, G. W. (2012). Experiments on the High-Power and High-Temperature Performance of Gear Contacts [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1340732447

    APA Style (7th edition)

  • Olson, Garrett. Experiments on the High-Power and High-Temperature Performance of Gear Contacts. 2012. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1340732447.

    MLA Style (8th edition)

  • Olson, Garrett. "Experiments on the High-Power and High-Temperature Performance of Gear Contacts." Master's thesis, Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1340732447

    Chicago Manual of Style (17th edition)

osu1340732447
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© 2012, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.