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A tribo-dynamic contact fatigue model for spur gear pairs.pdf
International Journal of Fatigue 98 (2017) 81–91
Contents lists available at ScienceDirect
International Journal of Fatigue
journal homepage: /locate/ijfatigue
A tribo-dynamic contact fatigue model for spur gear pairs
Sheng Li ?, Anusha Anisetti
Wright State University, 3640 Colonel Glenn Highway, Dayton, OH 45435, United States
article info
Article history: Received 20 October 2016 Received in revised form 12 January 2017 Accepted 17 January 2017 Available online 18 January 2017
Keywords: Gear Tribo-dynamics Contact fatigue
abstract
This study proposes a contact fatigue model for spur gears operating under the high speed condition where the dynamic behavior is evident. Realizing the tight relationship between the gear dynamics and the gear tribology, a six degree-of-freedom discrete dynamics model and a mixed elastohydrodynamic lubrication model for spur gears are bridged through an iterative numerical scheme to determine the surface normal pressure and tangential shear under the tribo-dynamic condition, where the gear dynamics and the gear tribology interact. The resultant multi-axial stress ?elds (from these surface tractions) on and below the surface are then used to assess the fatigue damage. A comparison between the tribo-dynamic and quasi-static life predictions is performed to demonstrate the important role of the gear tribo-dynamics in the fatigue damage. The impacts of the input torque, surface roughness and lubricant temperature on the gear contact fatigue under the tribo-dynamic condition are also investigated.
ó 2017 Elsevier Ltd. All rights reserved.
1. Introduction
The contact fatigue in the form of macro-pitting has been one of the most common failure modes in gearing systems. In both the automotive and aerospace applications, gear pairs often operate within a high speed range, where the gear dynamic behavior is evident and alters the tooth contact force signi?cantly. It has to be noted that the gear dynamics does not play alone. It interacts with th
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