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Adhesive wear with a coarse-grained discrete element model

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On the debris-level origins of adhesive wear

Jean-François Molinari, Ramin Aghababaei, Derek Warner

Every contacting surface inevitably experiences wear. Predicting the exact amount of material loss due to wear relies on empirical data and cannot be obtained from any physical model. Here, we analyze and quantify wear at the most fundamental level, i.e., ...

Natl Acad Sciences2017

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

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

A Simple, Fast and Low-Cost Method for in situ Monitoring of Topographical Changes and Wear Rate of a Complex Tribo-System Under Mixed Lubrication

Daniel Sage, Bastian Meylan

This contribution presents a simple, fast, and low-cost method to track in situ and in real time the evolution of the surface topography. The method combines an optical method (collimated light) with image analysis. The method was validated using a complex ...

Elsevier2016

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

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

Slip Fronts at Frictional Interfaces

David Simon Kammer

Even though friction affects everyday life in many ways, it is still one of the biggest mysteries of physics. Friction is a truly multi-scale phenomenon with a large variety of processes acting at various length and time scales. In recent years, much atten ...

EPFL2014

Plastic activity in nanoscratch molecular dynamics simulations of pure aluminium

Jean-François Molinari, Till Junge

Atomistic models for friction suffer from the severe length- and time-scale restrictions of molecular dynamics. In this paper, a novel approach to quantify the scratching work and the energy associated with plastic activity is used. The approach is combine ...

Pergamon-Elsevier Science Ltd2014

Friction and Hertzian contact in granular glass

Daniele Mari, Gérard Gremaud, Alessandro Luigi Sellerio

We study the jamming process arising in granular systems subjected to decreasing external vibration, which has features similar to the cooling of glass-forming liquids. We modify the friction between grains and observe that jamming occurs 'more easily' for ...

Iop Publishing Ltd2013