Issue 13, 2023

Torsion-induced stick-slip phenomena in the delamination of soft adhesives

Abstract

Soft adhesive contacts are ubiquitous in nature and are increasingly used in synthetic systems, such as flexible electronics and soft robots, due to their advantages over traditional joining techniques. While methods to study the failure of adhesives typically apply tensile loads to the adhesive joint, less is known about the performance of soft adhesives under shear and torsion, which may become important in engineering applications. A major challenge that has hindered the characterization of shear/torsion-induced delamination is imposed by the fact that, even after delamination, contact with the substrate is maintained, thus allowing for frictional sliding and re-adhesion. In this work, we address this gap by studying the controlled delamination of soft cylinders under combined compression and torsion. Our experimental observations expose the nucleation of delamination at an imperfection and its propagation along the circumference of the cylinder. The observed sequence of ‘stick-slip’ events and the sensitivity of the delamination process to material parameters are explained by a theoretical model that captures axisymmetric delamination patterns, along with the subsequent frictional sliding and re-adhesion. By opening up an avenue for improved characterization of adhesive failure, our experimental approach and theoretical framework can guide the design of adhesives in future applications.

Graphical abstract: Torsion-induced stick-slip phenomena in the delamination of soft adhesives

Supplementary files

Article information

Article type
Paper
Submitted
20 12月 2022
Accepted
27 2月 2023
First published
28 2月 2023
This article is Open Access
Creative Commons BY-NC license

Soft Matter, 2023,19, 2319-2329

Torsion-induced stick-slip phenomena in the delamination of soft adhesives

T. K. Venkatadri, T. Henzel and T. Cohen, Soft Matter, 2023, 19, 2319 DOI: 10.1039/D2SM01675C

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