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Tribology Letters

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01-12-2021 | Original Paper

Shakedown Analysis of Evolving Non-Hertzian Rolling Contact Using a Semi-analytical Numerical Model

Authors: Yaswanth Sai Jetti, Alison C. Dunn

Published in: Tribology Letters | Issue 4/2021

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Abstract

The non-conforming rolling contact under high loads results in considerable plastic deformation of the surface. This surface plastic flow is studied using a twin-disk tribometer, and the observed deformation as a function of the number of rolling cycles is classified into three distinct stages. Substantial geometric changes are observed in the initial stage and during this process, the contact type changed from Hertzian to non-Hertzian in the first few cycles, and then it changed from non-Hertzian back to near Hertzian by the end of this stage. A semi-analytical model is hence used to perform the contact analysis. Special traction elements are employed near the surface discontinuities within the contact area to resolve singularities. The contact area is observed to change from elliptic to a near-rectangular shape and the evolution of the contact parameters during this process is reported. Shakedown limits are obtained at different instants of the deformation process using Melan’s theorem. It is observed that the high stresses near the surface discontinuities greatly affect the shakedown limits. The actual stress state is observed to move on a shakedown map until it goes below the shakedown limit but above the elastic limit as predicted.

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Title: Shakedown Analysis of Evolving Non-Hertzian Rolling Contact Using a Semi-analytical Numerical Model
Authors: Yaswanth Sai Jetti
Alison C. Dunn
Publication date: 01-12-2021
Publisher: Springer US
Published in: Tribology Letters / Issue 4/2021
Print ISSN: 1023-8883
Electronic ISSN: 1573-2711
DOI: https://doi.org/10.1007/s11249-021-01506-x

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