A new friction measurement system for the frictional component of touch

Gee, M.G.; Tomlins, P E; Calver, A.; Darling, Richard H.; Rides, M

doi:10.1016/j.wear.2005.02.053

Cited by 75 publications

(77 citation statements)

References 7 publications

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“…Sivamani et al [12] have found that the skin friction appears to depend on age, anatomical site and skin hydration. Others have reported large friction coefficients (> 1) and large variations (> 100%) for human fingertips [13]. Therefore, in order to gain more insights into areas deserving further detailed study, we have also built another experimental system.…”

Section: Perceived Rankingmentioning

confidence: 99%

Quantifying touch–feel perception: tribological aspects

Liu

Yue

Cai

et al. 2008

Meas. Sci. Technol.

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Abstract. We report a new investigation into how surface topography and friction affect human touch-feel perception. In contrast with previous work based on micro-scale mapping of surface mechanical and tribological properties, this investigation focuses on the direct measurement of the friction generated when a fingertip is stroked on a test specimen. A special friction apparatus was built for the in-situ testing, based on a linear flexure mechanism with both contact force and frictional force measured simultaneously. Ten specimens, already independently assessed in a 'perception clinic', with materials including natural wood, leather, engineered plastics and metal were tested and the results compared with the perceived rankings. Because surface geometrical features are suspected to play a significant role in perception, a second set of samples, all of one material were prepared and tested in order to minimise the influence of properties such as hardness and thermal conductivity. To minimise subjective effects, all specimens were also tested in a roller-on-block configuration based upon the same friction apparatus, with the roller materials being steel, brass and rubber. This paper reports the detailed design and instrumentation of the friction apparatus, the experimental set up and the friction test results. Attempts have been made to correlate the measured properties and the perceived feelings for both roughness and friction. The results show that the measured roughness and friction coefficient both have a strong correlation with the rough-smooth and grippy-slippery feelings.

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Section: Perceived Rankingmentioning

confidence: 99%

Quantifying touch–feel perception: tribological aspects

Liu

Yue

Cai

et al. 2008

Meas. Sci. Technol.

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“…First, materials in contact have a strong influence. The COF between the skin and the smooth surface of a homogeneous material can be classified in the following decreasing order: soft polymers such as rubber, hard polymers (except polytetrafluoroethylene, PTFE) [12], metals and PTFE [13]. The rubbing against glass induces a lower or a higher friction coefficient than hard polymers [14] and metals, depending on the moisture amount in the skin/glass interface.…”

Section: Introductionmentioning

confidence: 99%

Influence of physico-chemical, mechanical and morphological fingerpad properties on the frictional distinction of sticky/slippery surfaces

Cornuault

Carpentier

Bueno

et al. 2015

J. R. Soc. Interface.

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This study investigates how the fingerpad hydrolipid film, shape, roughness and rigidity influence the friction when it rubs surfaces situated in the slippery psychophysical dimension. The studied counterparts comprised two 'real' ( physical) surfaces and two 'virtual' surfaces. The latter were simulated with a tactile stimulator named STIMTAC. Thirteen women and 13 men rubbed their right forefingers against the different surfaces as their arms were displaced by a DC motor providing constant velocity and sliding distance. Tangential and normal forces were measured with a specific tribometer. The fingerpad hydrolipid film was characterized by Fourier transform infrared spectroscopy. The shape and roughness of fingers were extrapolated from replicas. Indentation measurements were carried out to determine fingerpad effective elastic modulus. A clear difference was observed between women and men in terms of friction behaviour. The concept of tactile frictional contrast (TFC) which was introduced quantifies an individual's propensity to distinguish two surfaces frictionally. The lipids/ water ratio and water amount on the finger skin significantly influenced the TFC. A correlation was observed between the TFC and fingerpad roughness, i.e. the height of the fingerpad ridges. This is essentially owing to gender differences. A significant difference between men's and women's finger topography was also noted, because our results suggested that men have rougher fingers than women. The friction measurements did not correlate with the fingerpad curvature nor with the epidermal ridges' spatial period.

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“…[3] There is currently considerable interest to develop ways to improve the measurement of tactile perception. [4] The aim is to objectify the assessment by measurement of physical parameters that determine the skin feel of products. [3] Only selected products would then have to be submitted to extensive field tests.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, such measurements would inform the design of attractive, desirable products. [4] A wide variety of cosmetic powders are commercially-available, which differ in shape, size, compressibility, and oil absorption. Understanding how these properties affect the powder's performance on skin would provide guidance to developers of cosmetic and pharmaceutical formulations.…”

Section: Introductionmentioning

confidence: 99%

Particulate lubricants in cosmetic applications

Timm

Myant

Spikes

et al. 2011

Tribology International

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Polymer powders are commonly added to cosmetic formulations to improve product performance and skin feel. This study investigates the effect of particle concentration and size on the lubricating properties of powder suspensions. Results are reported for various particle sizes and concentrations.When the tribological contact was fully immersed the addition of particles had no effect.However different behaviour was observed when the contact was only partially-lubricated. In this case, a three stage friction coefficient curve was observed. By varying the particle size and concentration it was shown that the duration and magnitude of each stage can be controlled.

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A new friction measurement system for the frictional component of touch

Cited by 75 publications

References 7 publications

Quantifying touch–feel perception: tribological aspects

Quantifying touch–feel perception: tribological aspects

Influence of physico-chemical, mechanical and morphological fingerpad properties on the frictional distinction of sticky/slippery surfaces

Particulate lubricants in cosmetic applications

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