Soft Elastohydrodynamic Analysis of Radial Lip Seals With Deterministic Microasperities on the Shaft

Hadinata, Philip C.; Stephens, Lyndon Scott

doi:10.1115/ijtc2006-12120

Cited by 6 publications

(7 citation statements)

References 19 publications

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“…The reference case corresponds to typical values found in the literature, e.g., [11][12][13][15][16][17][18][19][20][21] for surface texturing (2r p = 100 lm, h p = 10 lm, S p = 0.3, c = 0.6), elastomer geometry (l 1 = 1.5 9 10 -3 m, l 2 = 1 9 10 -3 m), mechanical properties (E* = 10 7 Pa), and operating conditions (l = 0.05 Pa s, U = 2 m/s, c = 1.5 9 10 -6 m). The parametric analysis is performed by changing the value of each parameter in Table 1 in its turn while maintaining a fixed value for all the others.…”

Section: Resultsmentioning

confidence: 99%

“…Surface texturing of the rigid counterpart in SEHL, as suggested in [11][12][13], has a few disadvantages. It requires texturing of a significant large area as, for example, the entire length of the rod in elastomeric rod seals.…”

Section: Introductionmentioning

confidence: 98%

“…In all these studies, both of the mating surfaces were rigid. However, surface texturing is also effective in cases where one of the mating surfaces is soft (Young's modulus on the order of 10 MPa) [11][12][13][14] and may be deformed due to the hydrodynamic pressure and viscous shear. Such cases are known as soft elastohydrodynamic lubrication (SEHL).…”

Section: Introductionmentioning

confidence: 99%

“…However, the surface topography considered in these studies consisted mainly of traditional nonregular surface roughness rather than designed regular textured surfaces, which can enhance the tribological performance of the SEHL component. Hadinata and Stephens [11] developed SEHL model of a lip seal in which the shaft surface was textured with deterministic microasperities of different shapes and the elastomer surface was smooth. The authors showed that the microasperities texture can lead to significant improvement of the seal performance.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Elastomer Surface Texturing in Soft Elasto-Hydrodynamic Lubrication

2009

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The present study focuses on modeling the effect of elastomer surface texturing in soft elasto-hydrodynamic lubrication. The model consists of an elastomer with spherical microdimples sliding at a constant velocity relative to a rigid and smooth counterpart in the presence of viscous lubricant. The hydrodynamic lubrication and the elasticity problems are solved simultaneously for the cases of full and partial texturing of the elastomer surface. Load carrying capacity and friction force are evaluated by integration of the pressure and shear stress fields in the viscous lubricant, respectively. A parametric analysis is performed to obtain the optimum surface texturing parameters for maximum load and minimum friction.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Effect of Elastomer Surface Texturing in Soft Elasto-Hydrodynamic Lubrication

2009

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“…However, recently, the bearings and seals laboratory at the University of Kentucky has developed a manufacturing technique based on X-ray lithography and UV photolithography to fabricate these engineered surface textures. Hadinata and Stephens [41] conducted a numerical analysis to investigate the elastohydrodynamic effect of various geometries of microasperities. They used the Reynolds equation to calculate the load capacity, friction, and pumping of triangular, square, hexagonal, and circular microasperity geometries.…”

Section: Asperities On the Shaftmentioning

confidence: 99%

Review of the lubrication, sealing, and pumping mechanisms in oil- and grease-lubricated radial lip seals

Baart

Lugt

Prakash

2009

Proceedings of the Institution of Mechanical Engineers, Part J:

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Radial lip seals are successfully used since the 1940s to seal lubricated systems. Despite extensive experimental and theoretical research in the field, it is still not fully clear how these seals function. Experimental studies, found in the public literature, show that the relatively high surface roughness of the seal lip is very important for good and reliable performance. In addition, the pressure distribution under the lip seems to be a critical factor. Six fundamental hypotheses are presented on the lubrication, pumping, and sealing mechanisms to explain the working principles of these seals. It is generally accepted that lubrication results from microelastohydrodynamic film build up between the rough seal surface and the shaft. Non-symmetrical tangential deformations of the lip surface are observed during experiments and assumed to act like spiral groove bearings that generate a pumping action and lubricant film. Another hypothesis suggests that the lubricant will behave non-Newtonian under the very high shear rates experienced in operating conditions. This will reduce friction because of shear-thinning and enhances sealing. Macroscopic aids, like hydrodynamic pumping aids and engineered asperity patterns on the shaft, do improve seal performance. Almost all public literature discusses oil-lubricated radial lip seals while many seals are grease-lubricated, especially in certain technical fields. Due to the non-Newtonian behaviour of grease, the lubrication, sealing, and pumping mechanisms are assumed to differ from the oil-lubricated seals. Lower friction and improved protection against contamination are measured, and it is expected that the interest in grease lubrication will rapidly grow in future.

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Analysis of the influence of assembly deviation and repeated assembly on sealing performance of detachable aviation pipe joint

Zhai,

Shan,

et al. 2024

International Journal of Pressure Vessels and Piping

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Soft Elastohydrodynamic Analysis of Radial Lip Seals With Deterministic Microasperities on the Shaft

Cited by 6 publications

References 19 publications

The Effect of Elastomer Surface Texturing in Soft Elasto-Hydrodynamic Lubrication

The Effect of Elastomer Surface Texturing in Soft Elasto-Hydrodynamic Lubrication

Review of the lubrication, sealing, and pumping mechanisms in oil- and grease-lubricated radial lip seals

Analysis of the influence of assembly deviation and repeated assembly on sealing performance of detachable aviation pipe joint

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