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.
- Medicine - 10:08 New apps and e-tools protecting young people from mental health problems
- Medicine - 10:08 Whispering implants - surfaces that communicate in bio- chemical Braille
- Medicine - 10:07 Novartis showcases dermatology leadership on International Urticaria Day announcing new data to be presented at EADV 2014
- Social Sciences - 10:01 Young Aussie women now fatter but fitter
- Medicine - 10:01 Acupuncture Does Not Improve Chronic Knee Pain
- Environmental Sciences - 10:00 Online resource to support the work of biodiversity conservation organisations
- Medicine - 09:03 Exercise to prevent falls and fractures
- Medicine - 09:03 Food Poverty: Experts Say Foodbanks Are Inevitable in the UK
- Medicine - Oct 1 New drug- delivery capsule may replace injections
- Business - Sep 30 Chicago Innovation Exchange, Cisco narrow field to three teams for innovation challenge
- Earth Sciences - Sep 30 Garrett: Founders' vision 'resonates with my life'
- Life Sciences - Sep 30 Two UCLA scientists receive NIH grants to further BRAIN Initiative research
- Social Sciences - Sep 30 Ethical behavior can be contagious, study says
- Business - Sep 30 Comment: Osborne’s ‘death tax’ move puts once-in-a- generation pension reforms in jeopardy
- Life Sciences - Sep 30 Comment: Who your brain decides to make friends with when you start university
- Computer Science - Sep 30 ScribbleLive: U of’T entrepreneur revolutionizes delivery of breaking news
Researchers provide new insight into how metals fail
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.
Last job offers
- Sport Sciences - 1.10
ASSOCIATE PROFESS0R IN SOCIAL SCIENCES IN SPORT AND PHYSICAL ACTIVITY EDUCATION AND TRAINING
- Psychology - 1.10
LECTURER AND RESEARCHER TYPE 2 (MER2) IN CHILD AND ADOLESCENT PSYCHOLOGY CONSULTATION
- Business - 30.9
Dozent /-in Wirtschaftsinformatik mit Forschungserfahrung
- Pedagogy - 30.9
Postdoc (50%) in Deutsch als Fremdsprache / Zweitsprache
- Psychology - 30.9
Professeur-e associé-e ou Professeur-e assistant-e en PTC en psychologie du counseling
- Psychology - 30.9
Associate professor or Tenure track assistant Professor in Counseling Psychology
- Law - 30.9
Associate Professor, School of Law
- Earth Sciences - 30.9
Assistant Professor in Human Geography
- Business - 19.9
UniversitätsprofessorIn für die Stiftungsprofessur "Industrielle Energiesysteme"
- Literature - 17.9
Universitätsprofessur für Anglistische Sprachwissenschaft
- Earth Sciences - 30.9
Universitätsprofessur für Physische Geographie
- Social Sciences - 30.9
Universitätsprofessur für Kulturgeographie
- Administration - 25.9
Associate Professorship (or Professorship) in Behavioural Science and Public Policy
- Life Sciences - 24.9
Readerships / Professorships, Sainsbury Wellcome Centre for Neural Circuits and Behaviour
- Medicine - 1.10
Laboratory Medicine - Assistant, Associate or Full Professor WOT (AA8512)
- Arts - 1.10
Music Education - Assistant Professor (AA8482)