Tactile impression and friction of water on human skin

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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“…As noted earlier, this effect has been observed by other authors [8,9]. Other authors, however, did not note a bell curve [10][11][12].…”

Section: Finger Friction Response With Moisturesupporting

confidence: 71%

“…There is an initial increase in friction as moisture levels rise, before a threshold is reached and the levels reduce. This has been described as a bell-curve response and has been reported by a number of authors [8,9].…”

Section: Introductionmentioning

confidence: 64%

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

et al. 2010

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“…He had not been diagnosed with hyperhidrosis but thought that he had a tendency to sweat a lot on hands and fingers. Results of an experiment using artificial fingers suggested that the slip phenomenon occurs depending on the amount of moisture 7) . If the same experiment were done using a alive human finger of subject No.…”

Section: Discussionmentioning

confidence: 99%

[Paper] Sweat Absorption Reduces the Frictional Force Between a Finger Pad and the Surface of a Flat Plate

Kondo

Hasegawa

2017

MTA

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Braille contents can be presented to the visually impaired not only by dot patterns on an embossed paper but also dynamically by a machinery display. Material quality of surface of these Braille displays that are touched by fingers has an effect on comfort in reading Braille. The effect seems to be due mainly to the friction change caused by perspiration. In this research, we experimentally examined how sweat affects the friction between a finger and an object. Comparing an acrylic sheet with a copy paper used for the displays, we found the influence of the sweat to be greater on the acrylic sheet than the copy paper and also found, even if the fingertip was sweat, any change is not observed in frictional force when rubbing objects covered with the copy paper.

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“…Many researchers measured the interaction force between the fingertip and material surfaces as reliable information related to the finger pad's deformation because the forces cause the skin to deform [13][14][15][16][17][18][19]. For example, Wiertlewski et al [13] precisely measured the interaction forces when a material slid beneath a fingertip.…”

Section: Introductionmentioning

confidence: 99%

Wearable finger pad deformation sensor for tactile textures in frequency domain by using accelerometer on finger side

et al. 2017

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In this study, we set out to develop a method for estimating the fine and fast shear deformation of a finger pad, that is, the palm side of a fingertip, as it scans the surface of a material. Using a miniature accelerometer, we measured the acceleration at the radial skin, the deformation of which is accompanied by the shear deformation of the finger pad. Using a transfer function, as specified in a separate experiment, between the pad and side of a finger, we estimated the shear deformation of the finger pad in the frequency domain. A comparison between an estimate based on the accelerometer and another based on a precise force sensor for the tangential component of the interaction force between the fingertip and material surfaces showed that the estimation accuracy was sufficient for frequencies in excess of approximately 20-50 Hz and for skin deformation above 10 −6 m. Our technique merely requires that an accelerometer be attached to the side of the fingertip, which allows active texture exploration. These estimates or measurements of the finger skin deformation caused by touching materials will help us to comprehend the relationships between material surfaces and the resulting texture sensations.

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Tactile impression and friction of water on human skin

Cited by 52 publications

References 12 publications

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

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

[Paper] Sweat Absorption Reduces the Frictional Force Between a Finger Pad and the Surface of a Flat Plate

Wearable finger pad deformation sensor for tactile textures in frequency domain by using accelerometer on finger side

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