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Primeur weekly 2019-03-11

Focus

Interview with EuroHPC JU interim executive director Gustav Kalbe ...

Quantum computing

9,1 million euro for trinational quantum research ...

IBM achieves highest quantum volume to date and establishes roadmap for reaching quantum advantage ...

Microsoft Quantum Team is announcing the Microsoft Quantum Network ...

Los Alamos National Laboratory upgrades to D-Wave 2000Q quantum computer ...

New hurdle cleared in race toward quantum computing ...

Focus on Europe

Hyperion Research invites submissions for HPC Innovation Excellence Awards ...

Optalysys launches world's first commercial optical processing system, the FT:X 2000 ...

SDSC's Research Data Services to host first U.S. GO FAIR Office ...

Intel to support the Irish Centre for High End Computing on new collaborative quantum computing project ...

New simulation methods to visualise quantum effects in superfluid fermions ...

Middleware

International team to organize 2019 survey of MPI usages ...

Energy Laboratory chooses Qumulo's file storage for its computational science centre ...

Hardware

Mellanox showcases live system demonstrations of LinkX 200G & 400G cables and transceivers at OFC 2019 ...

Alan D. George named Interim Director of the Pittsburgh Supercomputing Center ...

ScaleMP and AMD announce strategic collaboration for scale-up EPYC servers ...

NVIDIA to acquire Mellanox for $6,9 billion ...

Air Force Research Laboratory introduces new sharable supercomputing capability for classified research ...

Applications

High CO2 levels can destabilize marine layer clouds ...

Using supercomputers to checkmate cancer ...

Revealing the role of neutron stars in gravitational wave discoveries ...

UC San Diego scientists computationally model chemical realities of water ...

TACC assists in massive data collection effort in lung development to help premature babies ...

New AI tool revolutionizes process for matching cancer patients with clinical trials ...

Raph Hix models the inner workings of supernovae on the world’s most powerful supercomputers ...

EPFL researchers simulate the process of adhesive wear ...

The Cloud

Oracle participates in National Science Foundation Cloud for scientific research project ...

EPFL researchers simulate the process of adhesive wear


Image of the computer simulation showing adhesive wear on a self-affine surface. Credit: LSMS / EPFL.
8 Mar 2019 Lausanne - Surface wear describes the process of material loss when two surfaces come into contact with each other. It has significant economic, social and health consequences - just think of the fine particles emitted by moving vehicles. What's more, it can be observed at all levels, from the nanoscale up to the scale of tectonic faults, with the formation of gouge. There are several wear mechanisms, yet the adhesive type is most common. It takes place when two surfaces - such as two pieces of the same metal - rub against one another and adhere.

One of the parameters that influence the wear mechanism is surface roughness. A better understanding of how surface roughness changes during the wear process would improve our control over this mechanism. This could lead to significant reductions in energy consumption, greenhouse gas emissions and costs.

Researchers at Ecole Polytechnique Fédérale de Lausanne's (EPFL) Computational Solid Mechanics Laboratory (LSMS) have taken an important step in this direction. They have digitally simulated how surface roughness changes over time, and their results are in line with experimental results. What sets their simulations apart is their duration: using a method developed at EPFL, the LSMS researchers were able to simulate these mechanisms over an extended period of time. In other words, they managed to capture the entire process - from the initial geometry to the final fractal geometry. Their findings were published on 8 March 2019 in Nature Communications .

This study is the LSMS researchers' third on adhesive wear. Their first study - published in 2016 inNature Communications- used digital simulations to describe how the process of adhesive wear produced fine particles. In 2017, taking their simulations further, they came out with a second study, appearing this time in Proceedings of the National Academy of Science, demonstrating that it was possible to predict the volume, shape and size of these particles.

Scientists are still far from fully understanding the physics underlying wear, and engineers must still carry out ad hoc experiments for each situation. What is known, however, is that worn surfaces display a characteristic fractal morphology, called self-affine, that has some fundamental properties regardless of the material and the scale. The origins of this self-affine morphology are still unknown.

Little work has been done on how surface roughness changes over time - and it has been mostly experimental. One limitation of experiments is that, because of the debris that forms, it is not easy to monitor how surface morphology changes during the rubbing process. The researchers overcame this problem through their digital simulations, which provide a constant stream of data.

"We used high-performance computer simulations to track the change in surface morphology in 2D materials", stated Enrico Milanese, a PhD student at the LSMS. "In our simulations, we observed that contact between two surfaces always generates a wear debris particle. That particle is then forced to roll between the two surfaces, wearing them down. This led us to conclude that wear debris must be present for the surfaces to develop their characteristic self-affine roughness."

In the future, the LSMS researchers hope to explore the origins of adhesive wear by applying their simulation approach to 3D models of materials that are of interest to industry.

Source: Ecole Polytechnique Fédérale de Lausanne - EPFL

Back to Table of contents

Primeur weekly 2019-03-11

Focus

Interview with EuroHPC JU interim executive director Gustav Kalbe ...

Quantum computing

9,1 million euro for trinational quantum research ...

IBM achieves highest quantum volume to date and establishes roadmap for reaching quantum advantage ...

Microsoft Quantum Team is announcing the Microsoft Quantum Network ...

Los Alamos National Laboratory upgrades to D-Wave 2000Q quantum computer ...

New hurdle cleared in race toward quantum computing ...

Focus on Europe

Hyperion Research invites submissions for HPC Innovation Excellence Awards ...

Optalysys launches world's first commercial optical processing system, the FT:X 2000 ...

SDSC's Research Data Services to host first U.S. GO FAIR Office ...

Intel to support the Irish Centre for High End Computing on new collaborative quantum computing project ...

New simulation methods to visualise quantum effects in superfluid fermions ...

Middleware

International team to organize 2019 survey of MPI usages ...

Energy Laboratory chooses Qumulo's file storage for its computational science centre ...

Hardware

Mellanox showcases live system demonstrations of LinkX 200G & 400G cables and transceivers at OFC 2019 ...

Alan D. George named Interim Director of the Pittsburgh Supercomputing Center ...

ScaleMP and AMD announce strategic collaboration for scale-up EPYC servers ...

NVIDIA to acquire Mellanox for $6,9 billion ...

Air Force Research Laboratory introduces new sharable supercomputing capability for classified research ...

Applications

High CO2 levels can destabilize marine layer clouds ...

Using supercomputers to checkmate cancer ...

Revealing the role of neutron stars in gravitational wave discoveries ...

UC San Diego scientists computationally model chemical realities of water ...

TACC assists in massive data collection effort in lung development to help premature babies ...

New AI tool revolutionizes process for matching cancer patients with clinical trials ...

Raph Hix models the inner workings of supernovae on the world’s most powerful supercomputers ...

EPFL researchers simulate the process of adhesive wear ...

The Cloud

Oracle participates in National Science Foundation Cloud for scientific research project ...