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Analytical and numerical results for the elasticity and adhesion of elastic films with arbitrary Poisson’s ratio and confinement

  • We present an approximate, analytical treatment for the linearly elastic response of a film with arbitrary Poisson's ratio ?, which is indented by a flat cylindrical punch while resting on a rigid foundation. Our approach is based on a simple scaling argument allowing the vast changes of the elastomer?s effective modulus E? with the ratio of film height h and indenter radius a to be described with a compact, analytical expression. This yields exact asymptotics for large and small reduced film heights h/a, whereby it also reproduces the observation that E?(h/a) has a pronounced minimum for ?>0.49 at h/a≈1.6. Using Green?s function molecular dynamics (GFMD), we demonstrate that the predictions for E?(h/a) are reasonably correct and generate accurate reference data for effective modulus and pull-off force. GFMD also reveals that the nature of surface instabilities occurring during stable crack growth as well as the crack initiation itself depend sensitively on the way how continuum mechanics is terminated at small scales, that is, on parameters beyond the two dimensionless numbers h/a and ? defining the continuum problem.

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Document Type:Article
Author:Christian Müller, Martin MüserORCiD
Parent Title (English):The Journal of Adhesion
First Page:648
Last Page:671
Publisher:Taylor & Francis
Year of first Publication:2023
Release Date:2022/11/18
Tag:adhesion; carck propagation; elastomer; modeling; theory; thin films
Impact:02.446 (2021)
Open Access:Open Access
Signature:INM 2023/008
Licence (German):License LogoCreative Commons - CC BY-NC-ND - Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International