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RESEARCH PAPERS

Low-Cycle Fatigue and Ultimate Strength Related to Gear Design

[+] Author and Article Information
W. L. Moore

The Boeing Company, Seattle, Wash.

J. Mech. Des 101(3), 373-379 (Jul 01, 1979) (7 pages) doi:10.1115/1.3454065 History: Received June 23, 1977; Online October 21, 2010

Abstract

This paper describes the development of a method for assessing the ultimate tensile and limit load strength values required by MIL-A-8860 (ASG) [1] for aircraft actuator gear teeth, and the subsequent effect of a few very-high-load cycles with regard to bending and surface fatigue life. American Gear Manufacturers Association (AGMA) rating procedures are found to require modification for pitch point contact, modulus of rupture, higher contact ratios, and the extension of S-N curves to one load cycle. These modified rating procedures, combined with qualifying statements, provide for relatively simple calculation. Background and application data are provided for gear teeth under relatively common load conditions that are not included in AGMA standards.

Copyright © 1979 by ASME
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