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Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Sewices, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188), Washington, DC 20503. 1. AGENCY USE ONLY (Leave blank) 2. REPORT DATE May 3. REPORT TYPE AND DATES COVERED 2000 Final 4. TITLE AND SUBTITLE Simulating Contractor Report 5. FUNDING NUMBERS Fatigue Crack Growth in Spiral Bevel Gears WU-581-30-13-00 NAG3-1993 6. AUTHOR(S) Lisa 1LI62211A47A E. Spievak, Paul A. Wawrzynek, and Anthony R. Ingraffea 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) Cornell 8. PERFORMING ORGANIZATION REPORT NUMBER University Cornell Fracture Group 641 Frank Rhodes Hall Ithaca, New York E-12287 14853 10. SPONSORING/MONITORING AGENCY REPORTNUMBER 9. SPONSORINCVMONITORING AGENCY NAME(S) AND ADDRESS(ES) U.S. Army Research Laboratory Cleveland, Ohio 44135-3191 and NASA Glenn Research Center NASA CR--2000-210062 ARL-CR--451 Cleveland, Ohio 44135-319t 11. SUPPLEMENTARY NOTES Project Manager, organization code David G. Lewicki, 5950, (216) 12a. DISTRIBUTION/AVAILABILITY Unclassified Subject Structures and Acoustics Division, NASA Glenn Research Center, 433-3970. 12b. DISTRIBUTION CODE STATEMENT - Unlimited Category: This publication 37 Distribution: is available from the NASA Center for AeroSpace Nonstandard Information, (301) 621-0390. 13. ABSTRACT (Maximum 200 words) The majority into vertical of helicopter rotorcraft power applications, aircraft. As requires a three elastic a result, bevel pinion areas growth rates moving must in three crack spiral loading bevel whether growth gears on a gear's the gear in gears and cracks. The is used arbitrarily shaped to predict load conditions. in greater The predictions in loading detail conditions prior to convert fatigue crack failure will be benign boundary three A spiral element and crack more bevel Boundary gears; element method 17. SECURITY CLASSIFICATION OF REPORT NSN 7540-01-280-5500 complex crack shape with trajectories to experimental parameters trajectories In linear in a results. is explored. and crack are identified. 15. NUMBER OF PAGES Spiral-bevel Unclassified crack the engine for the in conjunction rate model 14. SUBJECT TERMS Gears, gear's fatigue accurate from can occur. or catastrophic by comparison growth power propagation method dimensional are validated to predicting the horizontal tooth, is significant. of the geometry to variations be understood dimensions utilize determines to predict theories under systems to the cyclical trajectory model of the predictions that Due the capability mechanics sensitivity Critical a crack's dimensional fracture spiral The transmission for the rotor. Crack propagation; Fracture 12l :16. PRICE CODF:' mechanics; A06 18. SECURITY CLASSIFICATION OF THIS PAGE Unclassified 19. SECURITY CLASSIRCATION OF ABSTRACT 20. LIMITATION OF ABSTRACT Unclassified Standard Form 298 (Rev. 2-89) Prescribed 29B-102 by ANSI Std. Z39-1B