Open Access
Pitting fatigue characteristics of AISI M-50 and super nitralloy spur gears
TLDR
In this paper, two groups of 3.50-in. pitch-diameter spur gears, without tip relief, made from consumable-electrode vacuum-melted (CVM) AISI M-50 steel and CVM super nitralloy (5Ni-2A1) were tested under conditions which produced fatigue pitting.Abstract:
Two groups of 3.50-in. pitch-diameter spur gears, without tip relief, made from consumable-electrode vacuum-melted (CVM) AISI M-50 steel and CVM super nitralloy (5Ni-2A1) were tested under conditions which produced fatigue pitting. The M-50 gears had fatigue lives approximately 50 percent longer than the super nitralloy gears. Both groups of gears failed by classical rolling-element fatigue at the pitch circle. When the gears were overrun past initial spall formation, the spalled M-50 gear teeth failed by fatigue fracture. The M-50 material had higher wear than the super nitralloy material. Differences in fatigue life and wear were not considered statistically significant.read more
Citations
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Proceedings ArticleDOI
Surface Fatigue Lives of Case-Carburized Gears With an Improved Surface Finish
TL;DR: In this paper, a set of AISI 93 10 steel gears were provided with a near-mirror finish by superfinishing, which reduced the roughness average by about a factor of 5.
Book
An Experimental Investigation of the Influence of the Lubricant Viscosity and Additives on Gear Wear
Timothy L. Krantz,Ahmet Kahraman +1 more
TL;DR: In this paper, the influence of lubricant viscosity and additives on the average wear rate of spur gear pairs was investigated experimentally, and the wear rate was inversely proportional to the viscosities of the lubricant and to the lambda ratio (also sometimes called the specific film thickness).
Proceedings ArticleDOI
Increased Surface Fatigue Lives of Spur Gears by Application of a Coating
TL;DR: In this paper, a case-carburized AISI 9310 steel spur gears with and without a metal-containing, carbon-based coating were used for increasing gear surface fatigue lives.
Proceedings ArticleDOI
Pitting and Bending Fatigue Evaluations of a New Case-Carburized Gear Steel
Timothy L. Krantz,Brian Tufts +1 more
TL;DR: In this paper, a case-carburized case-hardened Rockwell C66 alloys were used for aircraft gearbox performance evaluation using surface fatigue tests and single-tooth bending fatigue tests.
Proceedings ArticleDOI
Investigation of Low-Cycle Bending Fatigue of AISI 9310 Steel Spur Gears
TL;DR: In this article, an investigation of the low-cycle bending fatigue of spur gears made from AISI 9310 gear steel was completed using the single-tooth bending method to achieve crack initiation and propagation.
References
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Journal ArticleDOI
Results of a Fifteen-Year Program of Flexural Fatigue Testing of Gear Teeth
John B. Seabrook,Darle W. Dudley +1 more
Journal ArticleDOI
Evaluation of Gear Materials Scoring at 700 F
TL;DR: In this article, a new high-temperature tester patterned after the Kelley roll tester was designed and constructed for use in high Mach no. aircraft gears, which requires consideration of high temperature rubbing compatibility.