| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
|
|
|
|
Inhomogenous Dislocation Nucleation Based on Atom Potential in Hexagonal Noncentrosymmetric Crystal Sheet |
| ZHAO Xue-Chuan, LIU Xiao-Ming, ZHUANG Zhuo, LIU Zhan-Li, GAO Yuan |
| Applied Mechanics Laboratory, Department of Engineering Mechanics, School of Aerospace, Tsinghua University, Beijing 100084 |
|
| Cite this article: |
|
ZHAO Xue-Chuan, LIU Xiao-Ming, ZHUANG Zhuo et al 2010 Chin. Phys. Lett. 27 016201 |
|
|
|
|
Abstract By introducing internal degree, the deformation of hexagonal noncentrosymmetric crystal sheet can be described by the revised Cauchy-Born rule based on atomic potential. The instability criterion is deduced to investigate the inhomogeneous dislocation nucleation behavior of the crystal sheet under simple loading. The anisotropic characters of dislocation nucleation under uniaxial tension are studied by using the continuum method associated with the instability criterion. The results show a strong relationship between yield stress and crystal sheet chirality. The results also indicate that the instability criterion has sufficient ability to capture the dislocation nucleation site and expansion. To observe the internal dislocation phenomenon, the prediction of the dislocation nucleation site and expansion domain is illustrated by MD simulations. The developed method is another way to explain the dislocation nucleation phenomenon.
|
| Keywords:
62.25.Mn
61.46.Np
|
|
|
Received: 25 June 2009
Published: 30 December 2009
|
|
| PACS: |
62.25.Mn
|
(Fracture/brittleness)
|
| |
61.46.Np
|
(Structure of nanotubes (hollow nanowires))
|
|
|
|
|
|
[1] Liu X M et al 2009 J. Phys. D 42 035404
[2] Liu X M et al 2009 Acta Metall. Sinica 45 137
[3] Liu Z L et al 2009 Scripta Mater. 60 594
[4] Liu Z L et al 2008 Int. J. Solids Struc. 453674
[5] Miller R E et al 2003 Acta Mater. 52 271
[6] Liu X M, Liu Z L et al 2009 Chin. Phys. Lett. 26 026103
[7] Li J et al 2002 Nature 418 307
[8] Miller R E and Acharya A 2004 J. Mech. Phys. Solids 52 1507
[9] Kitamura T, Umeno Y and Fushino R 2004 Mater. Sci.Eng. A 379 229
[10] Zhang P et al 2004 J. Mech. Phys. Solids 52977
[11] Jones J E 1924 Proc. Roy. Soc. A 106 463
[12] Tersoff J 1989 Phys. Rev. B 39 5566
[13] Chang T and Gao H 2003 J. Mech. Phys. Solids 51 1059
[14] Goze C, Vaccarini L, Henrard L, Bernier P, Hernandez Eand Rubio A 1999 Synthetic Metals 103 2500 |
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
