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On the Thermal and Contact Fatigue Behavior of Gear Contacts under Tribo-dynamic Condition

Anisetti, Anusha
http://rave.ohiolink.edu/etdc/view?acc_num=wright149363918488722

Abstract Details

2017, Doctor of Philosophy (PhD), Wright State University, Engineering PhD.
Gears are vital power transmitting mechanical components, in both automotive and aerospace applications, and commonly operate within relatively high rotational speed ranges. Therefore, the dynamic behavior of gears is inevitable and can be quite significant under certain circumstances. The gear dynamics introduces not only noises and vibrations, but also large tooth force amplitudes, and consequently large amplitudes of bending stresses and contact stresses, and high surface temperatures, promoting the failures of tooth bending fatigue, contact fatigue, and scuffing. This study focuses on the mechanism by which the gear dynamic responses affect the flash temperature rise and contact fatigue life using a gear tribo-dynamic formulation. The significance of this work is that it connects the gear dynamics and gear tribology disciplines and shows the importance of dynamic response on the two critical failure modes; scuffing and pitting. A six degree-of-freedom transverse-torsional discrete gear dynamics equation set is coupled with a thermal mixed elastohydrodynamic lubrication formulation to include the interactions between the gear dynamics and the gear tribological behavior. The flash temperature rises are quantified within a wide speed range under the different operating and surface conditions. The results indicate evident deviations of flash temperature rise between quasi-static condition and tribo-dynamic condition especially in the vicinities of the resonances. The interactive model of gear dynamics and gear tribological behavior is bridged through an iterative numerical scheme to determine the surface normal pressure and tangential shear under the tribo-dynamic condition. The resultant multi-axial stress fields (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. The results show that the fatigue life under tribo-dynamic conditions show large deviations at the vicinities of the resonances when compared to the quasi-static conditions.
Sheng Li, Ph.D. (Advisor)
Joseph Slater, Ph.D. (Committee Member)
Ahmet Kahraman, Ph.D. (Committee Member)
Ha-Rok Bae, Ph.D. (Committee Member)
Nikolai Priezjev, Ph.D. (Committee Member)
175 p.
Mechanical Engineering
Gear; Flash temperature; Tribo-dynamics; Mixed EHL; Contact Fatigue

Recommended Citations

Citations

  • Anisetti, A. (2017). On the Thermal and Contact Fatigue Behavior of Gear Contacts under Tribo-dynamic Condition [Doctoral dissertation, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright149363918488722

    APA Style (7th edition)

  • Anisetti, Anusha. On the Thermal and Contact Fatigue Behavior of Gear Contacts under Tribo-dynamic Condition . 2017. Wright State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=wright149363918488722.

    MLA Style (8th edition)

  • Anisetti, Anusha. "On the Thermal and Contact Fatigue Behavior of Gear Contacts under Tribo-dynamic Condition ." Doctoral dissertation, Wright State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright149363918488722

    Chicago Manual of Style (17th edition)

wright149363918488722
1,163
© 2017, some rights reserved.Creative Commons License On the Thermal and Contact Fatigue Behavior of Gear Contacts under Tribo-dynamic Condition by Anusha Anisetti is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by Wright State University and OhioLINK.
Release 3.2.12