Adhesion Asymmetry in Peeling of Thin Films with Homogeneous Material Properties: A Geometry-Inspired Design Paradigm

Ahmed Ghareeb, Ahmed Elbanna

Research output: Contribution to journalArticle

Abstract

Peeling of thin films is a problem of great interest to scientists and engineers. Here, we study the peeling response of thin films with nonuniform thickness profile attached to a rigid substrate through a planar homogeneous interface. We show both analytically and using finite element analysis that patterning the film thickness may lead to direction-dependent adhesion such that the force required to peel the film in one direction is different from the force required in the other direction, without any change to the film material, the substrate interfacial geometry, or the adhesive material properties. Furthermore, we show that this asymmetry is tunable through modifying the geometric characteristics of the thin film to obtain higher asymmetry ratios than reported previously in the literature. We discuss our findings in the broader context of enhancing interfacial response by modulating the bulk geometric or compositional properties.

Original languageEnglish (US)
Article number071005
JournalJournal of Applied Mechanics, Transactions ASME
Volume86
Issue number7
DOIs
StatePublished - Jul 1 2019

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peeling
Peeling
Materials properties
adhesion
Adhesion
asymmetry
Thin films
Geometry
thin films
geometry
Substrates
adhesives
engineers
Film thickness
Adhesives
film thickness
Finite element method
Engineers
profiles

Keywords

  • Interfacial adhesion
  • adhesion asymmetry
  • peeling force

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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AB - Peeling of thin films is a problem of great interest to scientists and engineers. Here, we study the peeling response of thin films with nonuniform thickness profile attached to a rigid substrate through a planar homogeneous interface. We show both analytically and using finite element analysis that patterning the film thickness may lead to direction-dependent adhesion such that the force required to peel the film in one direction is different from the force required in the other direction, without any change to the film material, the substrate interfacial geometry, or the adhesive material properties. Furthermore, we show that this asymmetry is tunable through modifying the geometric characteristics of the thin film to obtain higher asymmetry ratios than reported previously in the literature. We discuss our findings in the broader context of enhancing interfacial response by modulating the bulk geometric or compositional properties.

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