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Materials 2016, 9(8), 639; doi:10.3390/ma9080639

On the Convergence of Stresses in Fretting Fatigue

1
Department of Electrical Energy, Systems and Automation, Ghent University, Zwijnaarde B-9052, Belgium
2
Faculté des Sciences, de la Technologie et de la Communication, Université du Luxembourg, Luxembourg-Kirchberg L-1359, Luxembourg
3
Department of Communication Systems, Jozef Stefan Institute, Ljubljana 1000, Slovenia
4
Division of Computational Mechanics, Ton Duc Thang University, Ho Chi Minh City, Vietnam
5
Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam
6
Soete Laboratory, Faculty of Engineering and Architecture, Ghent University, Technologiepark Zwijnaarde 903, Zwijnaarde B-9052, Belgium
*
Author to whom correspondence should be addressed.
Academic Editor: Geminiano Mancusi
Received: 15 June 2016 / Revised: 14 July 2016 / Accepted: 22 July 2016 / Published: 29 July 2016
(This article belongs to the Special Issue Numerical Analysis of Tribology Behavior of Materials)
View Full-Text   |   Download PDF [4206 KB, uploaded 29 July 2016]   |  

Abstract

Fretting is a phenomenon that occurs at the contacts of surfaces that are subjected to oscillatory relative movement of small amplitudes. Depending on service conditions, fretting may significantly reduce the service life of a component due to fretting fatigue. In this regard, the analysis of stresses at contact is of great importance for predicting the lifetime of components. However, due to the complexity of the fretting phenomenon, analytical solutions are available for very selective situations and finite element (FE) analysis has become an attractive tool to evaluate stresses and to study fretting problems. Recent laboratory studies in fretting fatigue suggested the presence of stress singularities in the stick-slip zone. In this paper, we constructed finite element models, with different element sizes, in order to verify the existence of stress singularity under fretting conditions. Based on our results, we did not find any singularity for the considered loading conditions and coefficients of friction. Since no singularity was found, the present paper also provides some comments regarding the convergence rate. Our analyses showed that the convergence rate in stress components depends on coefficient of friction, implying that this rate also depends on the loading condition. It was also observed that errors can be relatively high for cases with a high coefficient of friction, suggesting the importance of mesh refinement in these situations. Although the accuracy of the FE analysis is very important for satisfactory predictions, most of the studies in the literature rarely provide information regarding the level of error in simulations. Thus, some recommendations of mesh sizes for those who wish to perform FE analysis of fretting problems are provided for different levels of accuracy. View Full-Text
Keywords: finite element analysis; fretting fatigue; convergence; stress analysis finite element analysis; fretting fatigue; convergence; stress analysis
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MDPI and ACS Style

Pereira, K.; Bordas, S.; Tomar, S.; Trobec, R.; Depolli, M.; Kosec, G.; Abdel Wahab, M. On the Convergence of Stresses in Fretting Fatigue. Materials 2016, 9, 639.

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