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International Journal for Multiscale Computational Engineering
Factor de Impacto: 1.016 Factor de Impacto de 5 años: 1.194 SJR: 0.554 SNIP: 0.68 CiteScore™: 1.18

ISSN Imprimir: 1543-1649
ISSN En Línea: 1940-4352

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.2012003171
pages 1-16

IMPACT-INDUCED BENDING RESPONSE OF SINGLE CRYSTAL AND FIVE-FOLD TWINNED NANOWIRES

Shan Jiang
The University of Mississippi Department of Mechanical Engineering 201E Carrier Hall University, MS 38677-1848
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
Hongwu Zhang
Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, P. R. China
Yonggang Zheng
State Key Laboratory of Structure Analysis for Industrial Equipment, Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian 116024
Hao Li
Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, Missouri 65211-2200, USA

SINOPSIS

The impact-induced bending response of single crystal and five-fold twinned copper nanowires has been investigated, based on molecular dynamics simulation with the embedded-atom method, to understand the effects of impact velocity and aspect ratio. It was found that bending vibration of the nanowires can occur with certain values of impact velocity or aspect ratio. At relatively low impact velocity and aspect ratio, only minor defects are formed in the confined impact area, and the most part of the nanowires remain in the elastic regime. The nanowires can rebound after reaching the maximum deflection, which exhibits the property of bending vibration as observed at the continuum level. By further increasing the impact velocity or aspect ratio, the vibration phenomenon becomes less obvious, and a large number of partial dislocations nucleate and slide on the (111) close-packed planes. Severe plastic deformation can occur with necking formation and ultimate breakage at very large impact velocity or aspect ratio. As compared with that of single crystal nanowires, the bending vibration of five-fold twinned nanowires shows the similar dependence on the impact velocity and aspect ratio. However, the deformation pattern of five-fold nanowires is different from that of single crystal ones due to their pre-existing twin boundaries that serve as the barriers to block the activity of partial dislocations. Secondary five-fold twins can also form, and then be annihilated during the bending process. Furthermore, unique microstructures such as bi-conjoint and multi-conjoint five-fold twins are observed, indicating that pre-existing fivefold twin boundaries may play an important role in facilitating the formation of secondary five-fold twins.


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