Rate-dependent adhesion of viscoelastic contacts, Part I: Contact area and contact line velocity within model randomly rough surfaces - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Mechanics of Materials Année : 2021

Rate-dependent adhesion of viscoelastic contacts, Part I: Contact area and contact line velocity within model randomly rough surfaces

Résumé

In this work, we investigate dissipative effects involved during the detachment of a smooth spherical glass probe from a viscoelastic silicone substrate patterned with micro-asperities. As a baseline, the pull-off of a single asperity, millimeter-sized contact between a glass lens and a smooth poly(dimethylsiloxane) (PDMS) rubber is first investigated as a function of the imposed detachment velocity. From a measurement of the contact radius () and normal load during unloading phase, the dependence of the strain energy release rate on the velocity of the contact line = ∕ is determined under the assumption that viscoelastic dissipation is localized at the edge of the contact. These data are incorporated into Muller's model (Muller, 1999) in order to predict the time-dependence of the contact size. Similar pull-off experiments are carried out with the same PDMS substrate patterned with spherical micro-asperities with a prescribed height distribution. From in situ optical measurements of the micro-contacts, scaling laws are identified for the contact radius and the contact line velocity. On the basis of the observed similarity between macro and microscale contacts, a numerical solution is developed to predict the reduction of the contact radius during unloading.
Fichier principal
Vignette du fichier
violano.pdf (1.79 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03243258 , version 1 (31-05-2021)

Identifiants

Citer

G. Violano, A. Chateauminois, L. Afferrante. Rate-dependent adhesion of viscoelastic contacts, Part I: Contact area and contact line velocity within model randomly rough surfaces. Mechanics of Materials, 2021, 160, pp.103926. ⟨10.1016/j.mechmat.2021.103926⟩. ⟨hal-03243258⟩
28 Consultations
138 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More