Onset of sliding of elastomer multicontacts: failure of a model of independent asperities to match experiments

Abstract

Modelling of rough frictional interfaces is often based on asperity models, in which the individual behaviour of individual microjunctions is assumed. In the absence of local measurements at the microjunction scale, quantitative comparison of such models with experiments is usually based only on macroscopic quantities, like the total tangential load resisted by the interface. Recently however, a new experimental dataset was presented on the onset of sliding of rough elastomeric interfaces, which includes local measurements of the contact area of the individual microjunctions. Here, we use this more comprehensive dataset to test the possibility of quantitatively matching the measurements with a model of independent asperities, enriched with experimental information about the area of microjunctions and its evolution under shear. We show that, despite using parameter values and behaviour laws constrained and inspired by experiments, our model does not quantitatively match the macroscopic measurements. We discuss the possible origins of this failure .

14 pages, 4 figures, accepted version

References in corpus (9)

• On the nature of surface roughness with application to contact mechanics, sealing, rubber friction and adhesion
• Shear-Induced Anisotropy in Rough Elastomer Contact
• Shear-induced contact area anisotropy explained by a fracture mechanics model
• Modeling friction on a mesoscale: Master equation for the earthquake-like model
• A 2-D Model for friction of complex anisotropic surfaces
• Adhesive contact of model randomly rough rubber surfaces
• Propagation Length of Self-healing Slip Pulses at the Onset of Sliding: A Toy Model
• Statistics of the separation between sliding rigid rough surfaces: Simulations and extreme value theory approach
• Relaxation Tribometry: A Generic Method to Identify the Nature of Contact Forces

Cited by in corpus (4)

• Contact with coupled adhesion and friction: Computational framework, applications, and new insights
• Finite deformations govern the anisotropic shear-induced area reduction of soft elastic contacts
• An asperity-based statistical model for the adhesive friction of elastic nominally flat rough contact interfaces
• Adhesion in soft contacts is minimum beyond a critical shear displacement