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Issue 6, 2019
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Singular dynamics in the failure of soft adhesive contacts

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We characterize the mechanical recovery of compliant silicone gels following adhesive contact failure. We establish broad, stable adhesive contacts between rigid microspheres and soft gels, then stretch the gels to large deformations by pulling quasi-statically on the contact. Eventually, the adhesive contact begins to fail, and ultimately slides to a final contact point on the bottom of the sphere. Immediately after detachment, the gel recoils quickly with a self-similar surface profile that evolves as a power law in time, suggesting that the adhesive detachment point is singular. The singular dynamics we observe are consistent with a relaxation process driven by surface stress and slowed by viscous flow through the porous, elastic network of the gel. Our results emphasize the importance of accounting for both the liquid and solid phases of gels in understanding their mechanics, especially under extreme deformation.

Graphical abstract: Singular dynamics in the failure of soft adhesive contacts

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Article information

10 Oct 2018
26 Nov 2018
First published
26 Nov 2018

Soft Matter, 2019,15, 1327-1334
Article type

Singular dynamics in the failure of soft adhesive contacts

J. D. Berman, M. Randeria, R. W. Style, Q. Xu, J. R. Nichols, A. J. Duncan, M. Loewenberg, E. R. Dufresne and K. E. Jensen, Soft Matter, 2019, 15, 1327
DOI: 10.1039/C8SM02075B

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