GLTRS--Glenn
TITLE AND SUBTITLE:
Consideration of Moving Tooth Load in Gear Crack Propagation Predictions

AUTHOR(S):
David G. Lewicki, Lisa E. Spievak, Paul A. Wawrzynek,
Anthony R. Ingraffea, and Robert F. Handschuh

REPORT DATE:
July 2000

FUNDING NUMBERS:
WU-581-30-13-00
1L162211A47A

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
NASA Glenn Research Center
Cleveland, Ohio 44135-3191
and
U.S. Army Research Laboratory
Cleveland, Ohio 44135-3191

PERFORMING ORGANIZATION REPORT NUMBER:
E-12347

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, DC 20546-0001
and
U.S. Army Research Laboratory
Adelphi, Maryland 20783-1145

REPORT TYPE AND DATES COVERED:
Technical Memorandum

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA TM-2000-210227
ARL-TR-2246
DETC2000/PTG-14386

SUPPLEMENTARY NOTES:
Prepared for the 8th International Power Transmission and Gearing Conference sponsored by the American Society of Mechanical Engineers, Baltimore, Maryland, September 10-13, 2000. David G. Lewicki and Robert F. Handschuh, U.S. Army Research Laboratory, NASA Glenn Research Center; Lisa E. Spievak, Paul A. Wawrzynek, and Anthony R. Ingraffea, Cornell Fracture Group, Cornell University, Ithaca, New York 14853-0001. Responsible person, David G. Lewicki, organization code 5950, (216) 433-3970.

ABSTRACT:
Robust gear designs consider not only crack initiation, but crack propagation trajectories for a fail-safe design. In actual gear operation, the magnitude as well as the position of the force changes as the gear rotates through the mesh. A study to determine the effect of moving gear tooth load on crack propagation predictions was performed. Two-dimensional analysis of an involute spur gear and three-dimensional analysis of a spiral-bevel pinion gear using the finite element method and boundary element method were studied and compared to experiments. A modified theory for predicting gear crack propagation paths based on the criteria of Erdogan and Sih was investigated. Crack simulation based on calculated stress intensity factors and mixed mode crack angle prediction techniques using a simple static analysis in which the tooth load was located at the highest point of single tooth contact was validated. For three-dimensional analysis, however, the analysis was valid only as long as the crack did not approach the contact region on the tooth.


SUBJECT TERMS:
Gears; Spiral-bevel gears; Crack propagation; Fracture mechanics;
Finite element method; Boundary element method

NUMBER OF PAGES:
15

PDF AVAILABLE FROM URL:
2000/TM-2000-210227.pdf
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