Publication

Study of the plastic interaction of asperities sitting on a rough surface

2017
Student Projects

Abstract

In this report the plastic interaction of asperities sitting on a rough surface is investigated. The plastic interaction between asperities is particularly important for the sliding of two surfaces; it plays a key role in the wearing process. Recent studies show that the transition from low wear to mild wear regime is due to plastic interaction between surface asperities. We aim to study the process at continuum mechanics level; being the problem very complex we will make several simplifications. We model asperities as rigid spheres and we study the indentation of an elastic-plastic half plane for normal and tangential load. Moreover we prescribe the stress profile induce by the contact at the surface interface; we assume a Hertzian stress profile. All the simulation are performed using Finite Element Method.

Official source

https://infoscience.epfl.ch/entities/publication/03773fa0-e201-4ec1-8928-3013d1e4f7ee

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2017
Student Projects

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/03773fa0-e201-4ec1-8928-3013d1e4f7ee

About this result

Related concepts (32)

Contact mechanics

Contact mechanics is the study of the deformation of solids that touch each other at one or more points. A central distinction in contact mechanics is between stresses acting perpendicular to the contacting bodies' surfaces (known as normal stress) and frictional stresses acting tangentially between the surfaces (shear stress). Normal contact mechanics or frictionless contact mechanics focuses on normal stresses caused by applied normal forces and by the adhesion present on surfaces in close contact, even if they are clean and dry.

Asperity (materials science)

In materials science, asperity, defined as "unevenness of surface, roughness, ruggedness" (from the Latin asper—"rough"), has implications (for example) in physics and seismology. Smooth surfaces, even those polished to a mirror finish, are not truly smooth on a microscopic scale. They are rough, with sharp, rough or rugged projections, termed "asperities". Surface asperities exist across multiple scales, often in a self affine or fractal geometry.

Wear

Wear is the damaging, gradual removal or deformation of material at solid surfaces. Causes of wear can be mechanical (e.g., erosion) or chemical (e.g., corrosion). The study of wear and related processes is referred to as tribology. Wear in machine elements, together with other processes such as fatigue and creep, causes functional surfaces to degrade, eventually leading to material failure or loss of functionality. Thus, wear has large economic relevance as first outlined in the Jost Report.

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Study of the plastic interaction of asperities sitting on a rough surface

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