- About Us
- Career Center
- Nano-Social Network
- Nano Consulting
- My Account
The eventual failure of metals, such as the aluminum in ships and airplanes, can often be blamed on breaks, or voids, in the material's atomic lattice. They're at first invisible, only microns in size, but once enough of them link up, the metal eventually splits apart.
Cornell engineers, trying to better understand this process, have discovered that nanoscale voids behave differently than the larger ones that are hundreds of thousands of atoms in scale, studied through traditional physics. This insight could lead to improved ability to predict how cracks grow in metals, and how to engineer better materials.
Graduate student Linh Nguyen and Derek Warner, assistant professor of civil and environmental engineering, reported their findings in the journal Physical Review Letters, Jan. 20. Using new atomistic simulation techniques, they concluded that the smallest voids in these materials, those having nanometer dimensions, don't contribute in the same way as microscale voids do in material failure at ordinary room temperatures and pressures.
When metals fail, a physical phenomenon known as plasticity often occurs, permanently deforming, or changing the shape of the material. Previously, it was theorized that both nanometer and microscale voids grow via plasticity as the material fails, but the new research says otherwise.
"While this was something amenable to study with traditional atomistic modeling approaches, the interpretation of previous results was difficult due to a longstanding challenge of time scaling," Warner said. "We've come up with a technique to better address that."
Nguyen and Warner's work is supported by the Office of Naval Research, which has particular interest in the use of aluminum and other lightweight, durable metals in high-performance ship structures.
For more information, please click here
Copyright © Cornell UniversityIf you have a comment, please Contact us.
|Related News Press|
News and information
Highlights from the Graphene Flagship April 22nd, 2016
Computer simulation discloses new effect of cavitation: Steam bubbles in fast flowing fluids obviously also result from chemical surface properties; use for reducing wear in pumps and plain bearings March 29th, 2016
Soft decoupling of organic molecules on metal June 23rd, 2016
Scientists engineer tunable DNA for electronics applications June 21st, 2016
Marrying superconductors, lasers, and Bose-Einstein condensates: Chapman University Institute for Quantum Studies (IQS) member Yutaka Shikano, Ph.D., recently had research published in Scientific Reports June 20th, 2016
Novel capping strategy improves stability of perovskite nanocrystals: Study addresses instability issues with organometal-halide perovskites, a promising class of materials for solar cells, LEDs, and other applications June 13th, 2016
Deep Space Industries and SFL selected to provide satellites for HawkEye 360ís Pathfinder mission: The privately-funded space-based global wireless signal monitoring system will be developed by Deep Space Industries and UTIAS Space Flight Laboratory May 26th, 2016