Abstract
Understanding how fingers slip on surfaces is essential for elucidating the mechanisms of haptic perception. This paper describes an investigation of the relationship between occlusion and the non-Coulombic slip of the finger pad, which results in the frictional force being a power law function of the normal load, with an index \( n \); Coulombic slip corresponds to \( n = 1 \). For smooth impermeable surfaces, occlusion of moisture excreted by the sweat glands may cause up to an order of magnitude increase in the coefficient of friction with a characteristic time of ~20 s. This arises because the moisture plasticises the asperities on the finger print ridges resulting in an increase in their compliance and hence an increase in the contact area. Under such steady state sliding conditions a finger pad behaves like a Hertzian contact decorated with the valleys between the finger print ridges, which only act to reduce the true but not the nominal contact area. In the limit, at long occlusion times (~50 s), it can be shown that the power law index tends to a value in the range \( {2 \mathord{\left/ {\vphantom {2 {3 \le n \le 1}}} \right. \kern-0pt} {3 \le n \le 1}} \). In contrast, measurements against a rough surface demonstrate that the friction is not affected by occlusion and that a finger pad exhibits Coulombic slip.
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References
Krueger, L.E.: Tactual perception in historical perspective: David Katz’s world of touch. In: Schiff, W., Foulke, E. (eds.) Tactual Perception; A Sourcebook, pp. 1–55. Cambridge University Press, Cambridge (1982)
Bensmaia, S.J., Hollins, M., Washburn, S.: Vibrotactile adaptation impairs discrimination of fine, but not coarse textures. Somatosensory Motor Res. 18, 253–262 (2001)
Wiertlewski, M., Endo, S., Wing, A.M., Hayward, V.: Slip-induced vibration influences the grip reflex: a pilot study. In: Proceedings of the 2013 World Haptics Conference, pp. 627–632 (2013)
Adams, M.J., Johnson, S.A., Lefèvre, P., Lévesque, V., Hayward, V., André, T., Thonnard, J.L.: Finger pad friction and its role in grip and touch. J. R. Soc. Interf. 10, 20120467 (2013)
Johnson, K.L.: Contact Mechanics. Cambridge University Press, Cambridge (1987)
Terekhov, A., Hayward, V.: Minimal adhesion surface area in tangentially loaded digital contacts. J. Biomech. 44, 2508–2510 (2011)
Cartmill, M.: The volar skin of primates: its frictional characteristics and their functional significance. Am. J. Phys. Anthrop. 50, 497–509 (1979)
Warman, P.H., Ennos, A.R.: Fingerprints are unlikely to increase the friction of primate fingerpads. J. Exp. Biol. 212, 2016–2022 (2009)
Wandersman, E., Candelier, R., Debrégeas, G., Prevost, A.: Texture-induced modulations of friction force: the fingerprint effect. Phys. Rev. Lett. 107, 164301 (2011)
Wiertlewski, M., Hudin, C., Hayward, V.: On the 1/f noise and non-integer harmonic decay of the interaction of a finger sliding on flat and sinusoidal surfaces. In: Proceedings of the 2011 World Haptics Conference, pp. 25–30 (2011)
Briscoe, B.J., Arvanitaki, A., Adams, M.J., Johnson, S.A.: The friction and adhesion of elastomers. Trib. Ser. 9, 661–672 (2001)
Pasumarty, S.M., Johnson, S.A., Watson, S.A., Adams, M.J.: Friction of the human finger pad: influence of moisture, occlusion velocity. Trib. Lett. 44, 117–137 (2011)
Andre, T., Levesque, V., Hayward, V., Lefevre, P., Thonnard, J.L.: Effect of skin hydration on the dynamics of fingertip gripping contact. J. R. Soc. Interf. 6, 1574–1583 (2011)
Archard, J.F.: Elastic deformation and the laws of friction. Proc. R. Soc. Lond. A, Math. Phys. Sci. 243, 190–205 (1957)
Tomlinson, S.E., Carré, M.J., Lewis, R., Franklin, S.E.: Human finger contact with small, triangular ridged surfaces. Wear. 271, 2346–2353 (2011)
Pawluk, D.T., Howe, R.D.: Dynamic contact of the human fingerpad against a flat surface. ASME J. Biomech. Eng. 121, 605–610 (1999)
Lin, D.C., Shreiber, D.I., Dimitriadis, E.K., Horkay, F.: Spherical indentation of soft matter beyond the Hertzian regime: numerical and experimental validation of hyperelastic models. Biomech. Model. Mechanobiol. 8, 345–358 (2009)
Adams, M.J., McKeown, R., Whall, A.: A micromechanical model of the confined uniaxial compression of an assembly of elastically deforming spherical particles. J. Phys. D Appl. Phys. 30, 912–920 (1997)
Derler, S., Rossi, R.M., Rotaru, G.M.: Understanding the variation of friction coefficients of human skin as a function of skin hydration and interfacial water films. Proc. Inst. Mech. Eng. Pt. J: J. Eng. Trib. (2014). doi:10.1177/1350650114527922
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This work was funded by the FP7 Marie Curie Initial Training Network PROTOTOUCH, grant agreement No. 317100.
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Dzidek, B.M., Adams, M., Zhang, Z., Johnson, S., Bochereau, S., Hayward, V. (2014). Role of Occlusion in Non-Coulombic Slip of the Finger Pad. In: Auvray, M., Duriez, C. (eds) Haptics: Neuroscience, Devices, Modeling, and Applications. EuroHaptics 2014. Lecture Notes in Computer Science(), vol 8618. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-44193-0_15
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DOI: https://doi.org/10.1007/978-3-662-44193-0_15
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