Simulation of surface pitting due to contact loading

Glodež, Srečko; Ren, Zoran; Flašker, Jože

doi:10.1002/(sici)1097-0207(19980915)43:1<33::aid-nme410>3.0.co;2-z

Cited by 34 publications

(22 citation statements)

References 17 publications

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“…The two cylinders are then further transformed into equivalent contact cylinder of equivalent radius R * , for which the Hertzian normal contact pressure distribution p(x) can be estimated with simple analytical relationships. Detailed description of the equivalent contact model and relevant equations is given in reference (Glodež et al, 1998). It has been shown, that for small coefficients of friction the distribution of tangential contact loading q(x) due to relative sliding can be estimated with a simple Coulomb friction law within the Hertzian model (Ren et al, 2002):…”

Section: Normal and Tangential Loading Conditionsmentioning

confidence: 99%

“…Widely used models for crack growth prediction consider the influence of rollingsliding loading, material properties and the influence of a fluid lubricant (Keer and Bryant, 1983;Kaneta et al, 1985;Bower, 1988;Blake, 1994;Bogdanski et al, 1996;Glodež et al, 1998;Kudish, 2000;Frolish et al, 2002;Ringsberg and Bergkvist, 2003;Fajdiga et al, 2004;). Rougher contact surfaces elevate contact temperature and thus lead to transient reduction of material yield strength over local areas, which results in plastically deformed layer.…”

Section: Introductionmentioning

confidence: 99%

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Modelling of Surface Crack Growth under Lubricated Rolling–Sliding Contact Loading

et al. 2005

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The paper describes modelling approach to computational simulation of surface crack growth subjected to lubricated rolling-sliding contact conditions. The model considers the size and orientation of the initial crack, normal and tangential loading due to rolling-sliding contact and the influence of fluid trapped inside the crack by a hydraulic pressure mechanism. The motion of the contact sliding load is simulated with different load cases. The strain energy density (SED) and maximum tangential stress (MTS) crack propagation criteria are modified to account for the influence of internal pressure along the crack surfaces due to trapped fluid. The developed model is used to simulate surface crack growth on a gear tooth flank, which has been also experimentally tested. It is shown that the crack growth path, determined with modified crack propagation criteria, is more accurately predicted than by using the criteria in its classical form.

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Section: Normal and Tangential Loading Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling of Surface Crack Growth under Lubricated Rolling–Sliding Contact Loading

et al. 2005

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“…Once the crack is initiated the gear tooth crack propagation life must be considered [77][78][79][80][81][82][83][84][85]. Podrug et.…”

Section: Introductionmentioning

confidence: 99%

“…They applied this model on a real spur gear pair that was also experimentally tested. After this work, Glodez et al [78,79] continued to develop a general computational model for simulating fatigue crack growth of mechanical elements under cyclic contact loading. For different combinations of contact surface curvatures and contact loadings, the effects of various crack length on the pit shapes and the first stress intensity factor were studied.…”

Section: Introductionmentioning

confidence: 99%

Multiscale modeling and simulation of rolling contact fatigue

Gharehbagh

Ali

2018

International Journal of Fatigue

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iii ABSTRACT In this thesis, a hierarchical multiscale method was developed to predict rolling contact fatigue lives of mechanical systems. In the proposed multiscale method, the molecular modeling and simulation of lubricant was conducted to investigate the friction between rolling contact surfaces. The calculated friction coefficient was passed to the continuum model of rolling contact components to predict fatigue lives.Molecular dynamics modeling and simulation of thin film lubrication and lubricated contact surfaces were carried out to investigate mechanisms of hydrodynamic lubrication at nano-scale first. Although various lubricant alkane chains were considered in the molecular model, the chain length of eight united molecules were mainly employed in this thesis. In addition, the effects of temperature and nano-particles (debris) on the friction forces were discussed. It was found that the existing of nano-particles (debris) could increase the friction force between contact surfaces with hydrodynamic lubrication.In the continuum model of the developed multiscale method, finite element analysis was employed to predict rolling contact fatigue life of rolling contact components, including bearing and gear-tooth. Specifically, the fatigue crack initiation of bearing was studied, and then the fatigue crack initiation and propagation in gear-tooth. In addition, the enhancement of gear-tooth fatigue life by using composite patches was discussed as well. It should be noted that the friction coefficient used in the continuum model was calculated in the molecular model. It is one-way message passing in iv the developed multiscale method.Another continuum method was studied and developed in this thesis to provide alternate methods for the continuum model in the proposed multiscale framework.Peridynamics method has advantages in modeling and simulation of discontinuities, including cracks, over the conventional finite element methods. The applications of Peridynamics in predicting fatigue crack initiation and propagation lives were discussed in this thesis. v PUBLIC ABSTRACTThis research aims to develop a hierarchical multiscale method to predict rolling contact fatigue lives of mechanical systems. In the proposed multiscale method, the molecular modeling and simulation of lubricant was conducted to investigate the friction between rolling contact surfaces. The calculated friction coefficient was passed to the continuum model of rolling contact components to predict fatigue lives.Molecular dynamics modeling and simulation of thin film lubrication and lubricated contact surfaces were carried out to investigate mechanisms of hydrodynamic lubrication at nano-scale first. In addition, the effects of temperature and nano-particles (debris) on the friction forces were discussed. It was found that the existing of nanoparticles (debris) could increase the friction force between contact surfaces with hydrodynamic lubrication.In the continuum model of the developed multiscale method, finite element analysis was employed to pred...

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“…However, in these previous studies, moving contact loads along the tooth surface had not been considered. Once the crack is initiated the gear tooth crack propagation life must be considered [3][4][5][6][7][8][9][10][11]. Podrug et al [2] presented a computational model for finding fatigue lives of gears under moving bending loads.…”

Section: Introductionmentioning

confidence: 99%