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Adhesion, cavitation, and fibrillation during the debonding process of pressure sensitive adhesives

S. Varchanis, A. Kordalis, Y. Dimakopoulos*, and J. Tsamopoulos

  • Laboratory of Fluid Mechanics & Rheology, Department of Chemical Engineering, University of Patras, 26500 Patras, Greece

  • *Corresponding author: dimako@chemeng.upatras.gr
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Phys. Rev. Fluids 6, 013301 – Published 15 January, 2021

DOI: https://doi.org/10.1103/PhysRevFluids.6.013301

Abstract

We employ the finite-extensible Giesekus viscoelastic constitutive equation to model viscoelastic fluidlike adhesives and study theoretically their response during the debonding process from a rigid surface. We consider a cylindrical sample of soft pressure sensitive adhesive, confined between two solid disks, and assume that small cavities preexist at the adhesive-solid interface due to surface inhomogeneities. When the debonding process is initiated, and the upper disk starts to move, elongating the sample, the cavities expand laterally and weaken the sample. As the debonding process evolves, the cavities start to interact with each other and deform mainly in the direction of elongation; this leads to the formation of thin sheets of material that induce the fibrillation of the sample. At the late stages of the process, these fibrils become very thin, and adhesion is lost. To simulate this complex process that features multiple free surfaces and three-phase contact lines, we solve the full three-dimensional, transient momentum and mass conservation equations coupled with the constitutive equation that accounts for the non-Newtonian stress contribution. The governing equations are expressed in their Lagrangian form and solved with a Petrov-Galerkin stabilized, finite element formulation. The physical domain is discretized with an unstructured mesh that is adaptively reconstructed, allowing us to reach very high deformations of the initial sample. Our results are in qualitative agreement with experimental observations, both regarding the stress-strain curve and the shape of the cavities. Finally, by performing a parametric analysis, we investigate the role of the rheological and geometrical properties of the sample on the adhesion energy of the material.

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Phys. Rev. Fluids 6, 013301– Published 15 January, 2021
  • Received 14 August 2020
  • Accepted 4 December 2020
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