An investigation of the hydrodynamic and mechanical behaviour of a soft nip rolling contact

Bohan, M. F. J.; Lim, C H; Korochkina, Tatyana; Claypole, Tim; Gethin, D. T.; Roylance, B. J.

doi:10.1243/1350650971542309

Cited by 12 publications

(17 citation statements)

References 9 publications

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“…This replicated starved and ooded junctions showing a large impact on the nip performance, in agreement with earlier work [12]. The approach in reference [14] used thin-®lm hydrodynamic equations coupled with linear elasticity with no assumptions concerning Hertzian-type behaviour. This showed that the pressure in the nip deviated from the Hertzian pro®le and agreed well with experimental data.…”

supporting

confidence: 86%

Influence of non-Newtonian fluids on the performance of a soft elastohydrodynamic lubrication contact with surface roughness

Bohan

Fox

Claypole

et al. 2003

Proceedings of the Institution of Mechanical Engineers, Part J:

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The paper focuses on the development and results of a numerical model to evaluate the fluid transfer behaviour for non-Newtonian fluids in a rough soft elastohydrodynamic nip contact. The solution required coupling of the fluid and elastomer regimes, with a multi-gridding technique to facilitate the high mesh densities required to capture the rough surface representation. The non-Newtonian fluid behaviour was modelled using a power-law model. The study evaluated circumferential and longitudinal roughness forms. The introduction of longitudinal roughness introduced significant shear in the nip with the resultant large change to the viscosity profile. This also removed the stagnation point in the centre of the nip. The longitudinal roughness had a large impact on the film thickness and flow through the nip while the circumferential affected the local performance of the nip but not its overall pumping capacity.

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supporting

confidence: 86%

Influence of non-Newtonian fluids on the performance of a soft elastohydrodynamic lubrication contact with surface roughness

Bohan

Fox

Claypole

et al. 2003

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Typical SEHL applications include, for example, different types of elastomeric seals, e.g., [15][16][17][18][19][20][21], elastomer bearings [22], and metering size press [23]. Shi and Salant [15] developed a deterministic mixed SEHL model, simulating the interface between a moving perfectly smooth rigid surface and a stationary rough perfectly elastic surface.…”

Section: Introductionmentioning

confidence: 99%

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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“…In 'soft EHL', where pressures are low and viscosity is assumed constant, Herrebrugh (1968), Hooke & O'Donoghue (1972) and Hall & Savage (1988b) investigated contacts in which the deformable bodies can be regarded as a half-space. The EHL of elastic layers was considered by Hooke (1986), Elsharkawy & Hamrock (1995) and Bohan et al (1997). In every case the motion of the fluid was modelled by lubrication theory with Reynolds boundary conditions applied to terminate the flow regime.…”

Section: Introductionmentioning

confidence: 99%

A model for deformable roll coating with negative gaps and incompressible compliant layers

et al. 2003

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A soft elastohydrodynamic lubrication model is formulated for deformable roll coating involving two contra-rotating rolls, one rigid and the other covered with a compliant layer. Included is a finite-strip model (FSM) for the deformation of the layer and a lubrication model with suitable boundary conditions for the motion of the fluid. The scope of the analysis is restricted to Newtonian fluids, linear elasticity/viscoelasticity and equal roll speeds, with application to the industrially relevant highly loaded or ‘negative gap’ regime. Predictions are presented for coated film thickness, inter-roll thickness, meniscus location, pressure and layer deformation as the control parameters – load (gap), elasticity, layer thickness and capillary number, $\hbox{\it Ca}$ – are varied. There are four main results: Hookean spring models are shown to be unable to model effectively the deformation of a compliant layer when Poisson's ratio $\nu\rightarrow 0.5$. In particular, they fail to predict the swelling of the layer at the edge of the contact region which increases as $\nu\rightarrow 0.5$; they also fail to locate accurately the position of the meniscus, $X_M$, and to identify the presence, close to the meniscus, of a ‘nib’ (constriction in gap thickness) and associated magnification of the sub-ambient pressure loop.Scaling arguments suggest that layer thickness and elasticity may have similar effects on the field variables. It is shown that for positive gaps this is true, whereas for negative gaps they have similar effects on the pressure profile and flow rate yet quite different effects on layer swelling (deformation at the edge of the contact region) and different effects on $X_M$.For negative gaps and $\hbox{\it Ca}\,{\sim}\,O(1)$, the effect of varying either viscosity or speed and hence $\hbox{\it Ca}$ is to significantly alter both the coating thickness and $X_M$. This is contrary to the case of fixed-gap rigid roll coating.Comparison between theoretical predictions and experimental data shows quantitive agreement in the case of $X_M$ and qualitive agreement for flow rate. It is shown that this difference in the latter case may be due to viscoelastic effects in the compliant layer.

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An investigation of the hydrodynamic and mechanical behaviour of a soft nip rolling contact

Cited by 12 publications

References 9 publications

Influence of non-Newtonian fluids on the performance of a soft elastohydrodynamic lubrication contact with surface roughness

Influence of non-Newtonian fluids on the performance of a soft elastohydrodynamic lubrication contact with surface roughness

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

A model for deformable roll coating with negative gaps and incompressible compliant layers

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