Surface strain measurements of fingertip skin under shearing

Journal of the Royal Society, Interface
Benoit DelhayeJean-Louis Thonnard

Abstract

The temporal evolution of surface strain, resulting from a combination of normal and tangential loading forces on the fingerpad, was calculated from high-resolution images. A customized robotic device loaded the fingertip with varying normal force, tangential direction and tangential speed. We observed strain waves that propagated from the periphery to the centre of the contact area. Consequently, different regions of the contact area were subject to varying degrees of compression, stretch and shear. The spatial distribution of both the strains and the strain energy densities depended on the stimulus direction. Additionally, the strains varied with the normal force level and were substantial, e.g. peak strains of 50% with a normal force of 5 N, i.e. at force levels well within the range of common dexterous manipulation tasks. While these observations were consistent with some theoretical predictions from contact mechanics, we also observed substantial deviations as expected given the complex geometry and mechanics of fingertips. Specifically, from in-depth analyses, we conclude that some of these deviations depend on local fingerprint patterns. Our data provide useful information for models of tactile afferent responses and bac...Continue Reading

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Sep 26, 2014·Journal of the Royal Society, Interface·Benoit DelhayeJean-Louis Thonnard

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Citations

Jun 18, 2016·Trends in Neurosciences·Cornelius Schwarz
Dec 8, 2017·Journal of the Royal Society, Interface·David GueorguievJean-Louis Thonnard
May 5, 2017·Journal of Neurophysiology·F CrevecoeurP Lefèvre
Jun 28, 2017·Proceedings of the National Academy of Sciences of the United States of America·Hannes P SaalSliman J Bensmaia
Nov 15, 2018·Micromachines·Hiroki IshizukaHiroyuki Kajimoto
May 8, 2018·Scientific Reports·Allan BarreaJean-Louis Thonnard
Jul 18, 2019·Journal of Neurophysiology·Alessandro MoscatelliMarc O Ernst
May 13, 2017·Cerebral Cortex·Todor V GerdjikovCornelius Schwarz
Jan 27, 2021·Neuroscience and Biobehavioral Reviews·Helen O'Shea, Stephen J Redmond
Nov 21, 2020·Science·Insang YouUnyong Jeong
Jul 8, 2021·Journal of Neurophysiology·Andrea ZangrandiGiovanni Di Pino
Sep 9, 2021·Journal of Neurophysiology·Benoit P DelhayePhilippe Lefèvre
Dec 4, 2021·Proceedings of the National Academy of Sciences of the United States of America·Laurence WillemetMichaël Wiertlewski

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