Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Roadrunner models shock wave effects on materials at atomic scale

Abstract:
Because of the Roadrunner supercomputer's unique capability, scientists are for the first time attempting to create atomic-scale models that describe how voids are created in materials, mostly metals, how they grow, and merge; how the materials may swell or shrink under stress; and how once broken bonds might reattach, and they're doing it at size and time scales that approach those of actual experiments, so that the models can be validated experimentally.

Roadrunner models shock wave effects on materials at atomic scale

Los Alamos, NM | Posted on November 9th, 2009

Using the reliable SPaSM (Scalable Parallel Short-range Molecular dynamics) code, adapted to run on Roadrunner, Tim Germann of DOE's Los Alamos National Laboratory is studying the physics of how materials break up, called "spall," and how pieces fly off, called "ejecta," from thin sheets of copper as shock waves force the material break apart.

"Our multibillion-atom molecular dynamics code is providing unprecedented insight into the nature of the critical event controlling the strength of materials, a fundamental long-standing problem in materials science," said Germann.

Some phenomena that can lead to "spall failure" as the material breaks apart, take place at precisely the time and length scales which were inaccessible to both simulation and experiment, and so have typically been described by "trial and error" models that could never be directly verified.

Steady advances in both experimental and simulation techniques — and supercomputer performance, culminating with Roadrunner — have closed this gap and are now enabling both simulations and experiments to probe shock deformation at between 1 and 10 microns, and at nanosecond time scales. Spall failure and the ejection of material from shocked metal surfaces are problems that have attracted increased attention both experimentally and theoretically at Los Alamos. Models are required that can predict both when a material will fail, and the amount of mass ejected from a shocked interface with a given surface finish and strength.

####

About Los Alamos National Laboratory
Los Alamos National Laboratory is a premier national security research institution, delivering scientific and engineering solutions for the nation's most crucial and complex problems. Our primary responsibility is ensuring the safety, security, and reliability of the nation's nuclear deterrent.



The Los Alamos of today emphasizes worker safety, effective operational safeguards & security, and environmental stewardship, while outstanding science remains the foundation of the Laboratory.



In addition to supporting the Lab's core national security mission, our work advances bioscience, chemistry, computer science, earth and environmental sciences, materials science, and physics disciplines.

For more information, please click here

Copyright © Los Alamos National Laboratory

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

Materials/Metamaterials

Thinnest feasible membrane produced April 17th, 2014

INSCX™ exchange to present Exchange trade reporting mechanism for engineered nanomaterials (NMs) to UK regulation agencies, insurers and upstream/downstream users April 17th, 2014

Engineers develop new materials for hydrogen storage April 15th, 2014

Industrial Nanotech, Inc. Lands First Major Order from Pemex, Mexico’s State-Owned Oil and Gas Company April 14th, 2014

Announcements

Iranian Researchers Present New Model to Strengthen Superconductivity at Higher Temperatures April 19th, 2014

Iranian Researchers Produce New Anti-Cancer Drug from Turmeric April 19th, 2014

'Exotic' material is like a switch when super thin April 18th, 2014

Innovative strategy to facilitate organ repair April 18th, 2014

Tools

Oxford Instruments Asylum Research Introduces the MFP-3D InfinityTM AFM Featuring Powerful New Capabilities and Stunning High Performance April 18th, 2014

More effective kidney stone treatment, from the macroscopic to the nanoscale April 17th, 2014

Scientists Capture Ultrafast Snapshots of Light-Driven Superconductivity: X-rays reveal how rapidly vanishing 'charge stripes' may be behind laser-induced high-temperature superconductivity April 16th, 2014

Aerotech X-Y ball-screw stage for economical high performance Planar positioning April 16th, 2014

NanoNews-Digest
The latest news from around the world, FREE







  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More














ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE