Analysis of fluid pressure, interface stresses and stress intensity factors for layered materials with cracks and inhomogeneities under elastohydrodynamic lubrication contact

Dong, Qingbing; Zhou, Kun; Wei, Rongbing; Luo, Jun; Srikanth, Narasimalu

doi:10.1016/j.ijmecsci.2015.01.007

Cited by 41 publications

(9 citation statements)

References 37 publications

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“…The governing Reynolds equation used to compute fluid-film distribution and other performance parameter is expressed as follows. 28,[35][36][37][38][39][40] Governing flow field equations.…”

Section: Lubricant Flow Field Equationmentioning

confidence: 99%

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Finite element analysis of tilted thrust pad bearings of various recesses shapes considering thrust pad flexibility

Yadav

Sharma

2015

Proceedings of the Institution of Mechanical Engineers, Part J:

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The performance characteristics of capillary compensated tilted pad hydrostatic bearing operating with Newtonian lubricant and cubic law lubricant are studied numerically considering the flexibility of pad. The two-dimensional Reynolds equation coupled with three-dimensional equilibrium equations governing the deformation of thrust pad has been solved by using finite element method. The results indicate the influence of tilt parameter and bearing deformation on bearing performance characteristics parameters. In the analysis, four different types of recess shapes such as rectangular, circular, elliptical, and square have been chosen for the analysis. The results show that the consideration of bearing pad deformation significantly increases the value of fluid-film stiffness coefficient and decreases the value of fluid-film damping coefficient. The fluid-film pressure distributions also compared for circular, elliptical, square, and rectangular bearing.

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Section: Lubricant Flow Field Equationmentioning

confidence: 99%

“…where Modification of fluid-film thickness. The fluid-film thickness of an elastohydrostatic thrust bearing is a summation of nominal fluid-film thickness and bearing pad deformation in z-direction and expressed as 12,32,33,39,40…”

Section: Lubricant Flow Field Equationmentioning

confidence: 99%

Finite element analysis of tilted thrust pad bearings of various recesses shapes considering thrust pad flexibility

Yadav

Sharma

2015

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…The motion of an object close to a wall with intervening fluid is one of the cornerstones of lubrication studies, where an established finding is the growth in lift generated on the object upon approach, enabling the design of robust and effective bearing setups [2][3][4]. Furthermore, there is rich literature on 'soft lubrication' too, where either the approaching object or the wall or both are deformable [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24], which finds applications in topics ranging from biotransport modelling [25][26][27][28] to tool design and analysis [29][30][31]. Such soft-lubrication setups are wide-spread in both natural and man-made world, examples being scanning probe microscope (SPM) and surface force apparatus (SFA) setups [32][33][34][35][36][37][38][39][40][41] and motion of biological entities like red blood corpuscles (RBCs) in fluidic environments [42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Influence of non-hydrodynamic forces on the elastic response of an ultra-thin soft coating under fluid-mediated dynamic loading

Karan

Chakraborty

2020

Physics of Fluids

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The force between two approaching solids in a liquid medium becomes increasingly large with decreasing separation, a phenomenon that prevents contact between the two solids. This growth in force occurs because of the intervening liquid, and, studies of such physical systems constitute the classical discipline of lubrication. Furthermore, when the solid(s) are soft, there are quantitative as well as qualitative alterations in the force interaction due to the solids' deformation. The underlying physics as well as resultant system behaviour are even more complex when forces of non-hydrodynamic origin come into play, two major classes of such forces being the DLVO (Derjaguin-Landau-Verwey-Overbeek) forces and the non-DLVO molecular forces. Studies assessing the coupling of these physical phenomenon are avenues of contemporary research. With this view, we perform an analytical study of fluid-mediated oscillatory motion of a rigid sphere over an ultra-thin soft coating, delineating the distinctive effects of solvation force as well as substrate compliance. Our key finding is the major augmentation in the force and substrate-deformation characteristics of the system due to solvation force when the confinement reduces to a few nanometers. Consideration of solvation force leads to upto four orders of magnitude and upto three orders of magnitude increment in force and substrate-deformation respectively. While higher softness leads to higher deformation (as expected), its effect on force and substratedeformation characteristics exhibits a tendency towards amelioration of the increment due to solvation force. arXiv:1908.03923v1 [cond-mat.soft]

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“…Wang et al 36 employed EIM to model the inclusions and obtained a solution to EHL for inhomogeneous materials. Dong and Zhou 37,38 and Dong et al 39 investigated the effects of subsurface cracks and inclusions on the pressure and film thickness profiles and subsurface elastic fields. However, the surface roughness was not considered in their solutions.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous structures with inhomogeneous inclusions under elastohydrodynamic lubrication contact with consideration of surface roughness

Dong

Yang

Wang

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part J:

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In order to predict the microscopic response of surface coatings and subsurface inhomogeneous inclusions, a semianalytical solution is developed for heterogeneous materials subjected to elastohydrodynamic lubrication contact. In this solution, the inhomogeneous inclusions are homogenized according to Eshelby's equivalent inclusion method with unknown eigenstrains to be determined. The topmost coating is assumed as an inhomogeneous inclusion of finite size and thus simulated with the same methodology. The disturbed surface deformation due to the presence of coatings and inhomogeneous inclusions are iteratively introduced into the lubricant film thickness until a convergence is achieved. The effects of surface roughness on the pressure and film thickness profiles and subsurface elastic fields are considered to approach the engineering practice. This solution takes into account the interactions between the loading body, the fluid lubricant and the coating/substrate system with embedded inclusions.

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Analysis of fluid pressure, interface stresses and stress intensity factors for layered materials with cracks and inhomogeneities under elastohydrodynamic lubrication contact

Cited by 41 publications

References 37 publications

Finite element analysis of tilted thrust pad bearings of various recesses shapes considering thrust pad flexibility

Finite element analysis of tilted thrust pad bearings of various recesses shapes considering thrust pad flexibility

Influence of non-hydrodynamic forces on the elastic response of an ultra-thin soft coating under fluid-mediated dynamic loading

Heterogeneous structures with inhomogeneous inclusions under elastohydrodynamic lubrication contact with consideration of surface roughness

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