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Surface strain measurements of fingertip skin under shearing

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Delhaye, Benoit [UCL] Barrea, Allan [UCL] Edin, Benoni [Umea University] Lefèvre, Philippe [UCL] Thonnard, Jean-Louis [UCL]

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 areawere 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 background for the design of novel haptic interfaces.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2016
Language Anglais
Journal information "Journal of the Royal Society Interface" - Vol. 13, no. 115, p. 20150874 [1-11] (2016)
Peer reviewed yes
Publisher Royal Society Publishing ((United Kingdom) London)
issn 1742-5689
e-issn 1742-5662
Publication status Publié
Affiliations UCL - SSS/IONS/COSY - Systems & cognitive Neuroscience
UCL - SST/ICTM/INMA - Pôle en ingénierie mathématique
UCL - (SLuc) Service de médecine physique et de réadaptation motrice
Louvain Bionics - Center of Interdisciplinary Expertise
Keywords skin mechanics ; friction ; touch ; tactile perception ; Louvain Bionics
Links
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Bibliographic reference Delhaye, Benoit ; Barrea, Allan ; Edin, Benoni ; Lefèvre, Philippe ; Thonnard, Jean-Louis. Surface strain measurements of fingertip skin under shearing. In: Journal of the Royal Society Interface, Vol. 13, no. 115, p. 20150874 [1-11] (2016)
Permanent URL http://hdl.handle.net/2078.1/170849