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A coupled finite element EHL and continuum damage mechanics model for rolling contact fatigue.pdf

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A coupled finite element EHL and continuum damage mechanics model for rolling contact fatigue.pdf

Tribology International 107 (2017) 173–183 Contents lists available at ScienceDirect Tribology International journal homepage: /locate/triboint A coupled ?nite element EHL and continuum damage mechanics model for rolling contact fatigue Neil R. Paulsona, Farshid Sadeghia,?, Wassim Habchib a Purdue University, School of Mechanical Engineering, West Lafayette, IN 47907, US b Lebanese American University, Department of Industrial and Mechanical Engineering, Byblos, Lebanon MARK ARTICLE INFO Keywords: Rolling contact fatigue Elastohydrodynamic Lubrication Damage mechanics ABSTRACT The objectives of this study were to investigate the e?ects of elastohydrodynamic lubrication pressure on the rolling contact fatigue life of non-conformal contacts. In order to achieve the objectives a ?nite element elastohydrodynamic lubrication (EHL) model was coupled with a continuum damage mechanics model. The coupled ?nite element damage mechanics and EHL (DMEHL) model was then used to investigate the e?ects of speed and damage variable on the fatigue life of non-conformal contacts. The results demonstrate that the damage variable has a signi?cant e?ect on pressure distribution within the contact and depending on the level of damage; the pressure distribution can signi?cantly deviate from the undamaged EHL pressure. The results also demonstrated that speed has a signi?cant e?ect on fatigue and failure. A parametric study was conducted to examine the e?ects of the damage variable on the progression of fatigue and evolution of the EHL pressure pro?le. The results demonstrate that the critical damage value is important to fatigue and can drastically a?ect the EHL pressure pro?les. 1. Introduction Rolling contact fatigue (RCF) is the predominant mode of failure in properly lubricated, maintained and installed rolling element bearings (REB) [1]. There are two main modes of RCF failures, surface and subsurface initiated. In surface initiated RCF failure, a fatigue crack initiates on the surfac