Modeling and Analytical Methods in Tribology

Kudish, Ilya I.; Covitch, Michael J.

doi:10.1201/9781420087024

Cited by 39 publications

(199 citation statements)

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“…It is also assumed that linear elastic fracture mechanics is applicable to small fatigue cracks. The details of the substantiation of these assumptions can be found in [1]. Based on these assumptions in the vicinity of a crack the stress intensity factors completely characterize the material stress state.…”

Section: Direction Of Fatigue Crack Propagationmentioning

confidence: 99%

“…The analysis of a significant amount of accumulated experimental data obtained from field exploitation and laboratory testing provides undisputable evidence of the most important factors affecting contact fatigue [1]. It is clear that the factors affecting contact fatigue the most are as follows (a) acting cyclic normal stress and frictional stress (detailed lubrication conditions, surface roughness, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, at best, most of the existing contact fatigue models are only partially based on the fundamental physical and mechanical mechanisms governing the fatigue phenomenon. Most of these models are of empirical nature and are based on assumptions some of which are not supported by experimental data or are controversial as it is in the case of fatigue models for bearings and gears [1]. Some models involve a number of approximations that usually do not reflect the actual processes occurring in material.…”

Section: Introductionmentioning

confidence: 99%

“…

The approach presented in this section provides a unified model of contact and structural fatigue of materials [1,2]. The model development is based on a block approach, i.e.

…”

mentioning

confidence: 99%

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Fracture Mechanics Based Models of Structural and Contact Fatigue

Kudish¹

2012

Applied Fracture Mechanics

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The approach presented in this section provides a unified model of contact and structural fatigue of materials [1,2]. The model development is based on a block approach, i.e. each block of the model describes a certain process related to fatigue and can be easily replaced by another block describing the same process differently. For example, accumulation of new more advanced knowledge of the process of fatigue crack growth may provide an opportunity to replaced the proposed here block dealing with fatigue crack growth with an improved one. Two examples of the application of this model to structural fatigue are provided. Initial statistical defect distributionIt is assumed that material defects are far from each other and practically do not interact. However, in some cases clusters of nonmetallic inclusions located very close to each other

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Section: Direction Of Fatigue Crack Propagationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…

The approach presented in this section provides a unified model of contact and structural fatigue of materials [1,2]. The model development is based on a block approach, i.e.

…”

mentioning

confidence: 99%

See 2 more Smart Citations

Fracture Mechanics Based Models of Structural and Contact Fatigue

Kudish¹

2012

Applied Fracture Mechanics

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“…by Hooke [23], Bisset [24,25], for line contacts, and more recently Kudish [26,27]. In numerical studies of (harmonic) waviness passing through the contact, it was found that the deformation of the waviness depends on a single parameter, which was the same for line and point contacts, see [9].…”

Section: Introductionmentioning

confidence: 99%

Boundary Layer Behaviour in Circular EHL Contacts in the Elastic-Piezoviscous Regime

2014

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The solution of elastohydrodynamically lubricated contacts at high loads and/or low speeds can be described as a Hertzian pressure with inlet and outlet boundary layers: zones where significant pressure flow occurs. For the soft lubrication regime (elastic-isoviscous), a self-similar solution exists in the boundary layers satisfying localized equations. In this paper, the boundary layer behaviour in the elastic-piezoviscous regime is investigated. The lengthscale of the boundary layers and the scaling of pressure and film thickness are expressed in nondimensional parameters. The boundary layer width scales as 1= ffiffiffiffi ffi M p (equivalent to " k 3=8 ), the maximum pressure difference relative to the Hertzian solution as 1= ffiffiffiffi ffi M 3 p (equivalent to " k 1=4 ) and the film thickness as 1= ffiffiffiffi ffi M 16 p (equivalent to " k 3=64 ) with M the Moes non-dimensional load and " k a dimensionless speed parameter. The Moes dimensionless lubricant parameter L was fixed. These scalings differ from the isoviscous-elastic (soft lubrication) regime. With increasing load (decreasing speed), the solution exhibits an increasing degree of rotational symmetry. The pressure varies less than 10 % over an angle less than 45 degrees from the lubricant entrainment direction. The results provide additional fundamental understanding of the nature of elastohydrodynamic lubrication and give physical rationale to the finding of roughness deformation depending on the ''inlet length''. The findings may contribute to more efficient numerical solutions and to improved semi-analytical prediction methods for engineering based on physically correct asymptotic behaviour.

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2012

Grease Lubrication in Rolling Bearings

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Modeling and Analytical Methods in Tribology

Cited by 39 publications

References 0 publications

Fracture Mechanics Based Models of Structural and Contact Fatigue

Fracture Mechanics Based Models of Structural and Contact Fatigue

Boundary Layer Behaviour in Circular EHL Contacts in the Elastic-Piezoviscous Regime

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