A 2-D model for friction of complex anisotropic surfaces. (March 2018)

• Record Type: Journal Article
• Authors: Costagliola, Gianluca; Bosia, Federico; Pugno, Nicola M.
• Is Part Of: Journal of the mechanics and physics of solids. Volume 112(2018)
• Page Start: 50
• Page End: 65
• Publication Date: 2018-03
• Subjects: Friction -- Numerical models -- Microstructures -- Anisotropic materials; Mechanics, Applied -- Periodicals; Solids -- Periodicals; Mechanics -- Periodicals; Mécanique appliquée -- Périodiques; Solides -- Périodiques; Mechanics, Applied; Solids; Periodicals; 531.05
• DOI: 10.1016/j.jmps.2017.11.015
• Languages: English
• ISSNs: 0022-5096

Abstract

Highlights: Friction in the presence of two-dimensional surface structures is determined by the non-trivial interaction of their features like size, shape and orientation. Static friction can be considerably reduced by increasing the perimeter and winding geometry of the structures. Structures consisting of high aspect ratio features can display large anisotropy in friction cofficients. Abstract: The friction force observed at macroscale is the result of interactions at various lower length scales that are difficult to model in a combined manner. For this reason, simplified approaches are required, depending on the specific aspect to be investigated. In particular, the dimensionality of the system is often reduced, especially in models designed to provide a qualitative description of frictional properties of elastic materials, e.g. the spring-block model. In this paper, we implement for the first time a two dimensional extension of the spring-block model, applying it to structured surfaces and investigating by means of numerical simulations the frictional behaviour of a surface in the presence of features like cavities, pillars or complex anisotropic structures. We show how friction can be effectively tuned by appropriate design of such surface features.