4.7 Article

On the retraction of an adhesive cylindrical indenter from a viscoelastic substrate

Journal

TRIBOLOGY INTERNATIONAL
Volume 164, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2021.107234

Keywords

Adhesion contact; Indentation; Line contact; Boundary Element Method

Funding

  1. European Research Council (ERC) under the European Union [681813]
  2. European Research Council (ERC) [681813] Funding Source: European Research Council (ERC)

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The retraction of a cylindrical rigid indenter from a viscoelastic substrate was studied using an efficient Green's function method. Hysteresis was observed in the load to area relationship, falling between predicted limits at high and low retraction velocities. Adhesion work changed during retraction, and a non-dimensional parameter was proposed to estimate the effect of viscoelasticity in adhesive hysteresis.
The retraction of a cylindrical rigid indenter from a viscoelastic substrate is studied by means of an efficient Green's function method. Hysteresis is observed in the load to area relationship in accordance with experimental results. Although our model relaxes many assumptions posed by LEFM-based analytical theories, the results fall between the limits, at high and low retraction velocities, predicted by the theories. Approaching the high velocity instantaneous limit requires, however, very high velocities or Maugis parameter. The work of adhesion is found to change during retraction. A non-dimensional parameter is proposed to estimate the effect of viscoelasticity in adhesive hysteresis.

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