Some Parameters Affecting Tactile Friction

Dinç, O. S.; Ettles, C. M. McC.; Calabrese, S. J.; Scarton, H. A.

doi:10.1115/1.2920653

Cited by 58 publications

(42 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The general trend emerging from this work is that the friction coefficient between a hard surface and the skin of the fingertip or hand decreases with an increasing surface roughness [2][3][4][5]. In these papers, the reported surface roughness values varied in the range R a = 0.03-45 lm.…”

Section: Effect Of Surface Roughnessmentioning

confidence: 96%

Influence of Surface Roughness, Material and Climate Conditions on the Friction of Human Skin

2009

View full text Add to dashboard Cite

The gliding comfort and performance of personal care and wellness products is strongly influenced by the sliding friction behaviour of human skin. In the open literature, most of the results on skin friction are related to the performance of cosmetic products or to the slip and grip properties of surfaces. Experiments were usually carried out on the forearm or the fingertips. The influence of the surface roughness and the material of engineering surfaces have received little attention so far, especially not in sliding contact with the skin of the cheek, or under different climate conditions. A custom-built rotating ring device was used to study the influence of the probe surface roughness (R a = 0.1-10 lm), the probe material (metals, plastics), the climate conditions (21-29°C, 37-92% RH) and skin hydration on the frictional behaviour of the skin on the cheek and the forearm. The amplitude of the surface roughness has a dominant influence on the friction behaviour: the smoother the surface, the higher the friction. Differences can be as large as a factor 5-10, especially in the range R a \ 1 lm. The probe material itself has no significant influence; except for PFTE which reduces the friction by approximately 25% compared to the other materials. In a humid climate, the skin becomes hydrated and the friction is twice as high as in a dry climate. The effect of skin hydration is smaller on the cheek than on the forearm, probably due to the presence of beard stubbles. A simple friction model for human skin is presented, based on adhesion friction, contact mechanics of rough surfaces and the interfacial shear stress of thin organic films. The model explains the effects of the probe surface roughness and skin compliance. Quantitative application of the model indicates that the biomechanical indentation and shearing behaviour of the stratum corneum is influenced by the same physical process, i.e. the intercellular bonding strength of the corneocytes.

show abstract

Section: Effect Of Surface Roughnessmentioning

confidence: 96%

Influence of Surface Roughness, Material and Climate Conditions on the Friction of Human Skin

2009

View full text Add to dashboard Cite

show abstract

“…It has also been proposed that the increase of the friction in the presence of moisture is due to capillary forces [33]. It was explained in §2 that the friction depends on the sum of the applied and adhesive forces (see equation (2.8)).…”

Section: Occlusionmentioning

confidence: 99%

“…This is a result of the smaller real area of contact for the rough compared with the smooth glass. Dinç et al [33] found that the friction of the finger pad decreases with increasing roughness of the countersurface but they believed that this was due to a rsif.royalsocietypublishing.org J R Soc Interface 10: 20120467 reduction in the capillary forces. It is an unlikely explanation since the normal forces were in the range 0.1-20 N, which is very much greater than those arising by a capillary mechanism as discussed above.…”

Section: Occlusionmentioning

confidence: 99%

“…It has been mentioned in §1 that stick -slip is associated with an unpleasant feel [33]. Stick-slip occurs when the friction decreases with increasing velocity provided that the system is not subcritically damped.…”

Section: Rsifroyalsocietypublishingorg J R Soc Interface 10: 20120467mentioning

confidence: 99%

“…However, there have been only a few systematic studies of the effect of this variable on the friction of the finger pad [111]. Dinç et al [33] carried out measurements at three sliding velocities of 6, 20 and 60 mm s 21 . They found that the coefficient of friction typically decreased with increasing velocity in this range for both smooth and rough polymeric surfaces.…”

Section: Influence Of Sliding Velocitymentioning

confidence: 99%

See 2 more Smart Citations

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

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.

show abstract

Friction between Players’ Hands and Sports Equipment (P7)

Tomlinson¹,

Lewis²,

Carré³

The Engineering of Sport 7

View full text Add to dashboard Cite

Some Parameters Affecting Tactile Friction

Cited by 58 publications

References 0 publications

Influence of Surface Roughness, Material and Climate Conditions on the Friction of Human Skin

Influence of Surface Roughness, Material and Climate Conditions on the Friction of Human Skin

Finger pad friction and its role in grip and touch

Friction between Players’ Hands and Sports Equipment (P7)

Contact Info

Product

Resources

About