Lubricant/Metallurgy Interaction Effects on Turbine Engine Lubricant Load Rating.
Final rept. 1 Mar 73-1 Mar 76,
SOUTHWEST RESEARCH INST SAN ANTONIO TEX
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This investigation has as its objective the development of an improved methodology for aircraft power spur gear design, with primary emphasis on gear-tooth scuffing scoring and secondary emphasis on gear-tooth pitting surface fatigue. Toward this end, mathematical models are proposed for scuffing and pitting, as well as for another relevant but less important failure mode, rubbing wear. Basic data for the scuffing and pitting models were derived from sliding-rolling disk tests using the AFAPL disk tester. Gear scuffing and pitting tests were also performed, using two WADD gear machines, to evaluate the validity of the two models. The scuffing model was found to yield scuff-limited gear power-transmitting capacities to about five percent of the actual. However, the several correlating factors employed in the model require independent confirmation and rationalization. The pitting model was found to yield gear pitting lives about ten times the actual, due principally to the weak statistical base of the quantitative data available and also a lack of basic understanding of the pitting process in gears. The wear model, which is not within the scope of this investigation, was not tested. The investigation has revealed many areas where basic understanding or quantitative data are still inadequate. Recommendations for additional research are presented. Author
- Lubricants and Hydraulic Fluids
- Jet and Gas Turbine Engines