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Tribological interactions of the finger pad and tactile displays

Dzidek, Brygida Maria (2017)
Ph.D. thesis, University of Birmingham.

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This thesis summarise the results of an investigation of the tribological interactions of the human finger pad with different surfaces and tactile displays. In the wide range of analyses of the mechanical properties of the finger pad, an attempt has been made to explain the nature of the interactions based on critical material parameters and experimental data. The experimental data are presented together with detailed modelling of the contact mechanics of the finger pad compressed against a smooth flat surface. Based on the model and the experimental data, it was possible to account of the loading behaviour of a finger pad and derive the Young’s modulus of the fingerprint ridges. The frictional measurements of a finger pad against smooth flat surfaces are consistent with an occlusion mechanism that is governed by first order kinetics. In contrast, measurements against a rough surface demonstrated that the friction is unaffected by occlusion since Coulombic slip was exhibited. The thesis includes an investigation of critical parameters such as the contact area. It has been shown that four characteristic length scales, rather than just two as previously assumed, are required to describe the contact mechanics of the finger pad. In addition, there are two characteristic times respectively associated with the growth rates of junctions formed by the finger pad ridges and of the real area of contact. These length and time scales are important in understanding how the Archardian-Hertzian transition drives both the large increase of friction and the reduction of the areal load index during persisting finger contacts with impermeable surfaces. Established and novel models were evaluated with statistically meaningful experiments for phenomena such as lateral displacement, electrostatic forces and squeeze-film that have advanced applications.

Type of Work:Ph.D. thesis.
Supervisor(s):Adams, Mike and Zhang, Zhibing
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Chemical Engineering
Additional Information:

Publications resulting from research:

Dzidek, B.M., Adams, M.J., Andrews, J.W., Zhang, Z. and Johnson, S.A., 2017. Contact mechanics of the human finger pad under compressive loads. Journal of The Royal Society Interface, 14(127), p.20160935.

Bochereau. S., Dzidek B.M., Adams M.J., Hayward V., 2017, Characterizing and imaging gross and real finger contacts under dynamic loading., IEEE Transaction of Haptics.

Sednaoui, T., Vezzoli, E., Dzidek, B.M., Lemaire-Semail, B., Chappaz, C. and Adams, M., 2017. Friction Reduction Through Ultrasonic Vibration Part 2: Experimental Evaluation of Intermittent Contact and Squeeze Film Levitation. IEEE Transactions on Haptics.

Dzidek, B., Bochereau, S., Johnson, S., Hayward, V. and Adams, M., 2016, April. Frictional dynamics of finger pads are governed by four length-scales and two time-scales. In Haptics Symposium (HAPTICS), 2016 IEEE (pp. 161-166). IEEE.

Sednaoui, T., Vezzoli, E., Dzidek, B., Lemaire-Semail, B., Chappaz, C. and Adams, M., 2015, June. Experimental evaluation of friction reduction in ultrasonic devices. In World Haptics Conference (WHC), 2015 IEEE (pp. 37-42). IEEE.

Vezzoli, E., Dzidek, B., Sednaoui, T., Giraud, F., Adams, M. and Lemaire-Semail, B., 2015, June. Role of fingerprint mechanics and non-Coulombic friction in ultrasonic devices. In World Haptics Conference (WHC), 2015 IEEE (pp. 43-48). IEEE.

Dzidek, B.M., Adams, M., Zhang, Z., Johnson, S., Bochereau, S. and Hayward, V., 2014, June. Role of occlusion in non-Coulombic slip of the finger pad. In International Conference on Human Haptic Sensing and Touch

Subjects:TJ Mechanical engineering and machinery
Institution:University of Birmingham
ID Code:7909
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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