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International Journal for Multiscale Computational Engineering
Facteur d'impact: 1.016 Facteur d'impact sur 5 ans: 1.194 SJR: 0.554 SNIP: 0.68 CiteScore™: 1.18

ISSN Imprimer: 1543-1649
ISSN En ligne: 1940-4352

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.v7.i3.30
pages 195-204

A Study on the Collapse of Self-Similar Hardening Behavior of Nanostructures

Yong Gan
Department of Civil and Environmental Engineering, University of Missouri-Columbia, USA
Zhen Chen
Department of Civil & Environmental Engineering, University of Missouri, USA; Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian 116024, P. R. China

RÉSUMÉ

The rate-dependent tensile responses of nanofilms and nanowires made of tungsten, copper, and gold, respectively, are investigated with the molecular dynamics method to understand the collapse of self-similar hardening (smaller is stronger) behavior of nanostructures. It is shown that such collapse is strongly dependent on material properties and specimen geometry. It is also demonstrated that the critical length scale characterizing the collapse of self-similar hardening decreases with the increase of strain rate. The plastic deformations of tungsten nanostructures and copper nanowires are in agreement with the dislocation starvation model for the self-similar hardening behavior, while the observed deformations of gold specimens and copper nanfilms imply that the phenomenon of "smaller is softer" is mainly due to the surface effects.

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