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Journal Articles Frontiers in Mechanical Engineering Year : 2021

A JKR-Like Solution for Viscoelastic Adhesive Contacts

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Abstract

A closed-form solution for the adhesive contact of soft spheres of linear elastic material is available since 1971 thanks to the work of Johnson, Kendall, and Roberts (JKR). A similar solution for viscoelastic spheres is still missing, though semi-analytical and numerical models are available today. In this note, we propose a closed-form analytical solution, based on JKR theory, for the detachment of a rigid sphere from a viscoelastic substrate. The solution returns the applied load and contact penetration as functions of the contact radius and correctly captures the velocity-dependent nature of the viscoelastic pull-off. Moreover, a simple approach is provided to estimate the stick time, i.e., the delay between the time the sphere starts raising from the substrate and the time the contact radius starts reducing. A simple formula is also suggested for the viscoelastic pull-off force. Finally, a comparison with experimental and numerical data is shown.
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hal-03372863 , version 1 (11-10-2021)

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Guido Violano, Antoine Chateauminois, Luciano Afferrante. A JKR-Like Solution for Viscoelastic Adhesive Contacts. Frontiers in Mechanical Engineering, 2021, 7, ⟨10.3389/fmech.2021.664486⟩. ⟨hal-03372863⟩
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