Paper Titles
Preface
Continuum Analyses for Intersonic and Supersonic Fracture
p.1
Size Effects of Hair-Sized Structures – Torsion
p.11
Anisotropic and Isotropic Elasticity, and its Equivalence for Singularity, Interface and Crack in Bimaterials and Trimaterials
p.23
Strength and Fracture of Single Crystal Metal Nanowire
p.33
Micromechanics and Rock Failure Process Analysis
p.39
Mesoscopic Study of Ductile Fracture of Aluminium Alloy LY12CZ
p.45
Fracture and Crack Growth Resistance Behaviour of γ-Titanium Aluminide
p.51
Application of Fracture Mechanics to Arch Dam Analysis
p.57

Strength and Fracture of Single Crystal Metal Nanowire

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Abstract:

Numerical simulations have been carried out to determine the mechanical property of single crystal copper nanowire subjected to tension using the molecular dynamics method. The mechanism of deformation, strength and fracture are elucidated based on these numerical simulations. No strengthening is found after yielding of the single crystal nanowire. The simulation results show that the strength of copper nanowire is far greater than that of realistic polycrystalline bulk copper. By decreasing the size of the nanowire's cross-section, which leads to an increase of the ratio of surface atoms, the yield stress is increased. The strain rate has an influence on strength, and mechanism of deformation and fracture. When the strain rate is comparatively low, plastic deformation arises from dislocation slips and twins. However, when the strain rate is sufficiently high, amorphization is a dominant factor of plastic deformation and super-plasticity is found. The fracture process is demonstrated using the atomic images.

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Periodical:

Key Engineering Materials (Volumes 261-263)

Pages:

33-38

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.261-263.33

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Online since:

April 2004

Authors:

Heng An Wu, Ai Kah Soh, Xiu Xi Wang, Z.H. Sun

Keywords:

Fracture, Mechanical Property, Metal Nanowire, Molecular Dynamic Simulation, Size Effect, Strain Rate, Strength

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© 2004 Trans Tech Publications Ltd. All Rights Reserved

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