Surface strain measurements of fingertip skin under shearing

被引:63
作者
Delhaye, Benoit [1 ,2 ,5 ]
Barrea, Allan [1 ,2 ]
Edin, Benoni B. [6 ]
Lefevre, Philippe [1 ,2 ]
Thonnard, Jean-Louis [1 ,3 ,4 ]
机构
[1] Catholic Univ Louvain, Inst Neurosci IoNS, B-1200 Brussels, Belgium
[2] Catholic Univ Louvain, Inst Informat & Commun Technol, Elect & Appl Math ICTEAM, B-1200 Brussels, Belgium
[3] Catholic Univ Louvain, Clin Univ St Luc, Phys & Rehabil Med Dept, B-1200 Brussels, Belgium
[4] Catholic Univ Louvain, Clin Univ St Luc, Phys & Rehabil Med Dept, Louvain, Belgium
[5] Univ Chicago, Dept Organismal Biol & Anat, 1025 E 57Th St, Chicago, IL 60637 USA
[6] Umea Univ, Physiol Sect, Dept Integrat Med Biol, Umea, Sweden
基金
瑞典研究理事会;
关键词
skin mechanics; friction; touch; tactile perception; MODEL; BIOMECHANICS;
D O I
10.1098/rsif.2015.0874
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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 background for the design of novel haptic interfaces.
引用
收藏
页数:11
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