Sliding friction at elastomer/glass contact: Influence of the wetting conditions and instability analysis

Deleau, Fabrice; Mazuyer, Denis; Koenen, Alain

doi:10.1016/j.triboint.2008.04.012

Cited by 74 publications

(45 citation statements)

References 13 publications

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“…For elastomer/glass contacts, it has been observed that thin water films (approx. 200 nm) are progressively developed at asperity contacts as the sliding velocity is increased from 10 to 100 mm s 21 [82]. In this mixed lubrication regime, the friction decreased with increasing velocity, thus providing evidence that this is a possible mechanism for the smaller friction of a wet finger pad compared with that in the fully occluded state.…”

Section: Rsifroyalsocietypublishingorg J R Soc Interface 10: 20120467mentioning

confidence: 78%

“…The surface mean roughness of the elastomer was 1 mm and the contact area of the asperities was unaffected by the presence of water; the reduction in friction was considered to arise from an attenuation of the autoadhesion. It is well established that such interactions are attenuated by wetting [85] and they were large for the elastomer studied by Deleau et al [82] compared with skin. Elastomers are also different from skin because they are not plasticized by water and hence the friction does not increase in the wet state.…”

Section: Occlusionmentioning

confidence: 97%

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Finger pad friction and its role in grip and touch

Adams

Johnson

Lefèvre

et al. 2013

J. R. Soc. Interface.

224

201

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Many aspects of both grip function and tactile perception depend on complex frictional interactions occurring in the contact zone of the finger pad, which is the subject of the current review. While it is well established that friction plays a crucial role in grip function, its exact contribution for discriminatory touch involving the sliding of a finger pad is more elusive. For texture discrimination, it is clear that vibrotaction plays an important role in the discriminatory mechanisms. Among other factors, friction impacts the nature of the vibrations generated by the relative movement of the fingertip skin against a probed object. Friction also has a major influence on the perceived tactile pleasantness of a surface. The contact mechanics of a finger pad is governed by the fingerprint ridges and the sweat that is exuded from pores located on these ridges. Counterintuitively, the coefficient of friction can increase by an order of magnitude in a period of tens of seconds when in contact with an impermeably smooth surface, such as glass. In contrast, the value will decrease for a porous surface, such as paper. The increase in friction is attributed to an occlusion mechanism and can be described by first-order kinetics. Surprisingly, the sensitivity of the coefficient of friction to the normal load and sliding velocity is comparatively of second order, yet these dependencies provide the main basis of theoretical models which, to-date, largely ignore the time evolution of the frictional dynamics. One well-known effect on taction is the possibility of inducing stick -slip if the friction decreases with increasing sliding velocity. Moreover, the initial slip of a finger pad occurs by the propagation of an annulus of failure from the perimeter of the contact zone and this phenomenon could be important in tactile perception and grip function.

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Section: Rsifroyalsocietypublishingorg J R Soc Interface 10: 20120467mentioning

confidence: 78%

Section: Occlusionmentioning

confidence: 97%

Finger pad friction and its role in grip and touch

Adams

Johnson

Lefèvre

et al. 2013

J. R. Soc. Interface.

224

201

View full text Add to dashboard Cite

show abstract

“…Persson et al took the phenomenon of water entrapment into the context of tire rubber-road contact [28]. A. Koenen et al revealed several influencers on the friction properties of wiper blade and windscreen contact [29]. Moreover, the special contribution to friction by thin water film under high contact pressure has been observed in several studies at nanoscale [30].…”

Section: Introductionmentioning

confidence: 99%

The Reduction of Static Friction of Rubber Contact under Sea Water Droplet Lubrication

2017

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Abstract:In this work, a series of experimental tests is carried out in laboratory conditions which set the rubber compound (soft and stiff), the normal load, and the direction of propagation of sea water droplets into the interface of rubber-steel pipe contact as variables. The results show that the maximum static frictions (F) of rubber-pipe contacts increase as the normal load increases in both dry and lubricating conditions, and the values of F for the softer rubber are higher than that for the stiffer rubber. However, significant reduction in static friction is found due to the lubrication of sea water droplets. The influence of lubrication is stronger when the droplets propagate into the contact interfaces at the tail edge than that at the front edge. Capture sequences of the contact region facilitate the lubrication of seawater droplets by accelerating the progress of separation in the contact interfaces, thus reducing the static friction force. This investigation improves our understanding of the lubrication of sea water droplets during pipe-laying operation, and it will help us to conduct further research on the accuracy and safety of offshore engineering.

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“…These previous studies [13][14][15][16] yielded some interesting results as to how the coefficient of friction changes with the addition of water. However, it is hard to relate these results directly back to the design of objects.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Friction Mechanisms Between the Human Finger and Flat Contacting Surfaces in Moist Conditions

et al. 2010

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Human hands sweat in different circumstances and the presence of sweat can alter the friction between the hand and contacting surface. It is therefore important to understand how hand moisture varies between people, during different activities and the effect of this on friction.In this study a survey of fingertip moisture was done. Friction tests were then carried out to investigate the effect of moisture.Moisture was added to the surface of the finger, the finger was soaked in water, and water was added to the counter-surface; the friction of the contact was then measured. It was found that the friction increased, up until a certain level of moisture and then decreased. The increase in friction has previously been explained by viscous shearing, water absorption and capillary adhesion. The results from the experiments enabled the mechanisms to be investigated analytically. This study found that water absorption is the principle mechanism responsible for the increase in friction, followed by capillary adhesion, although it was not conclusively proved that this contributes significantly. Both these mechanisms increase friction by increasing the area of contact and therefore adhesion. Viscous shearing in the liquid bridges has negligible effect. There are, however, many limitations in the modelling that need further exploration.

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Sliding friction at elastomer/glass contact: Influence of the wetting conditions and instability analysis

Cited by 74 publications

References 13 publications

Finger pad friction and its role in grip and touch

Finger pad friction and its role in grip and touch

The Reduction of Static Friction of Rubber Contact under Sea Water Droplet Lubrication

Understanding the Friction Mechanisms Between the Human Finger and Flat Contacting Surfaces in Moist Conditions

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