Negative Poisson’s ratios in metal nanoplates

Duc Tam Ho, Soon-Dong Park, Soon-Yong Kwon, Kibog Park and Sung Youb Kim ()
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Duc Tam Ho: School of Mechanical and Advanced Materials Engineering, Ulsan National Institute of Science and Technology
Soon-Dong Park: School of Mechanical and Advanced Materials Engineering, Ulsan National Institute of Science and Technology
Soon-Yong Kwon: School of Mechanical and Advanced Materials Engineering, Ulsan National Institute of Science and Technology
Kibog Park: School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology
Sung Youb Kim: School of Mechanical and Advanced Materials Engineering, Ulsan National Institute of Science and Technology

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract The Poisson’s ratio is a fundamental measure of the elastic-deformation behaviour of materials. Although negative Poisson’s ratios are theoretically possible, they were believed to be rare in nature. In particular, while some studies have focused on finding or producing materials with a negative Poisson’s ratio in bulk form, there has been no such study for nanoscale materials. Here we provide numerical and theoretical evidence that negative Poisson’s ratios are found in several nanoscale metal plates under finite strains. Furthermore, under the same conditions of crystal orientation and loading direction, materials with a positive Poisson’s ratio in bulk form can display a negative Poisson’s ratio when the material’s thickness approaches the nanometer scale. We show that this behaviour originates from a unique surface effect that induces a finite compressive stress inside the nanoplates, and from a phase transformation that causes the Poisson’s ratio to depend strongly on the amount of stretch.

Date: 2014
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DOI: 10.1038/ncomms4255

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