Concept

Asperity (materials science)

Publications associées (43)

Continuum versus discrete approach in modeling of wear processes

Enrico Milanese, Lucas Henri Galilée Frérot

Wear of materials is a very complex phenomenon due to its tight correlation with all the other phenomena that take place at the interface of two bodies interacting with one another, like friction, contact and lubrication. When two opposing surfaces slide o ...

2018

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

Francesco Bardi

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 studie ...

2017

Micromechanical Origins of Adhesive Wear Mechanisms: From Asperity Smoothing to Debris Creation

Jean-François Molinari, Ramin Aghababaei, Derek Warner

The adhesive wear process consists of several physical phenomena including plasticity and fracture which occur at different length and time scales. Despite the critical importance of the adhesive wear process in all engineering applications, it is still de ...

2017

Normal adhesive contact on rough surfaces: efficient algorithm for FFT-based BEM resolution

Jean-François Molinari, Guillaume Anciaux, Valentine Ginette Madeleine Rey

We introduce a numerical methodology to compute the solution of an adhesive normal contact problem on rough surfaces with the Boundary Element Method. Based on the Fast Fourier Transform and the Westergaard’s fundamental solution, the proposed algorithm en ...

2017

The role of the roughness spectral breadth in elastic contact of rough surfaces

Jean-François Molinari, Guillaume Anciaux, Vladislav Yastrebov

We study frictionless and non-adhesive contact between elastic half-spaces with self-affine surfaces. Using a recently suggested corrective technique, we ensure an unprecedented accuracy in computation of the true contact area evolution under increasing pr ...

2017

Critical length scale controls adhesive wear mechanisms

Jean-François Molinari, Ramin Aghababaei, Derek Warner

The adhesive wear process remains one of the least understood areas of mechanics. While it has long been established that adhesive wear is a direct result of contacting surface asperities, an agreed upon understanding of how contacting asperities lead to w ...

Springer2016

Tribocorrosion under fluid lubrication

Shoufan Cao

Wear is still the key problem causing the failure and limiting the lifetime of artificial hip joints, especially for the polymer acetabular cup in the metal-on-polymer and ceramic-on-polymer articulations. To reduce the wear, metal-on-metal articulation ha ...

EPFL2016

Wear at the asperity level: An atomistic viewpoint

Jean-François Molinari, Ramin Aghababaei, Derek Warner

Tribological problems are particularly difficult to comprehend. Different physical mechanisms (including the environment, plastic deformation, third body interactions, phase transformations, recrystallization) interact at disparate length and time scales. ...

2015

From infinitesimal to full contact between rough surfaces: Evolution of the contact area

Jean-François Molinari, Guillaume Anciaux, Vladislav Yastrebov

We carry out a statistically meaningful study on self-affine rough surfaces in elastic frictionless non-adhesive contact. We study the evolution of the true contact area under increasing squeezing pressure from zero up to full contact, which enables us to ...

Pergamon-Elsevier Science Ltd2015

Modelling Plasticity in Nanoscale Contact

Till Junge

The problem of mechanical contact is a truly multiscale one. Atomistic effects that violate continuum theory dominate the deformations of contacting asperities, while the interactions between distant asperities occur through long-range elasticity. This the ...

EPFL2014

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