Publications de Derek Warner | EPFL Graph Search

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

An interatomic pair potential with tunable intrinsic ductility

William Curtin, Derek Warner, Varun Parameswaran Rajan

A family of interatomic potentials is constructed for which the intrinsic ductility can be tuned systematically. Specifically, the elastic constants and critical energy release rate for Griffith cleavage, G(Ic), are held constant, while the critical energy ...

Institute of Physics2016

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

Illuminating the chemo-mechanics of hydrogen enhanced fatigue crack growth in aluminum alloys

Derek Warner, Kristopher Learion Baker

The presence of elemental hydrogen is known to accelerate fatigue crack growth in aluminum alloys. However, a direct link between experimental data and the governing atomistic mechanisms has remained elusive. Here we present a series of computational studi ...

Pergamon-Elsevier Science Ltd2015

Investigation of crack tip dislocation emission in aluminum using multiscale molecular dynamics simulation and continuum modeling

William Curtin, Derek Warner

This work investigates the dislocation nucleation processes that occur at the tip of a crack in aluminum under a broad range of crystallographic orientations and temperatures. A concurrent multiscale molecular dynamics - continuum simulation framework is e ...

Elsevier2014

Computational micromechanics of dynamic compressive loading of a brittle polycrystalline material using a distribution of grain boundary properties

Jean-François Molinari, Derek Warner

Elsevier2008

Effect of normal loading on grain boundary migration and sliding in copper

Jean-François Molinari, Derek Warner

2008