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Tribology Letters

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01-06-2022 | Tribology Methods

A Tribometric Device for the Rolling Contact of Soft Elastomers

Authors: Brodie K. Hoyer, Rong Long, Mark E. Rentschler

Published in: Tribology Letters | Issue 2/2022

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Abstract

Rolling contact experimentation is a viable and instructive method for exploring the adhesive contact between surfaces. When applied to soft elastomeric or engineered surfaces, the results of such experiments can provide insights relevant to medical robotics, soft gripping applications, and reversible dry adhesives for bandages or wearable devices. We have designed and built a tribometric device to capture normal and tangential forces between a rolling indenter and substrate correlated with contact area imaging. The device was validated using an experimental setup involving a rigid, nominally smooth acrylic cylinder rolling against a flat polydimethylsiloxane (PDMS) substrate, the results of which matched favorably with accepted contact mechanics theories. The second test involved an indenter with a rigid core and thin (3 mm) smooth shell of a highly deformable polyvinyl chloride rolling on the same PDMS substrate. This test deviated significantly from analytical predictions, highlighting the effects of finite-thickness and rate-dependent phenomena. This device will facilitate experimental investigations of the rolling contact mechanics between textured surfaces and soft tissue-like materials, which is an important fundamental problem in medical robotics.

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Because of the difficulty of establishing a zero point of indentation for adhesive cylindrical contact, values are relative to a zero point at which a defined contact area was no longer observed across the extent of the indenter.

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Title: A Tribometric Device for the Rolling Contact of Soft Elastomers
Authors: Brodie K. Hoyer
Rong Long
Mark E. Rentschler
Publication date: 01-06-2022
Publisher: Springer US
Published in: Tribology Letters / Issue 2/2022
Print ISSN: 1023-8883
Electronic ISSN: 1573-2711
DOI: https://doi.org/10.1007/s11249-022-01580-9

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