| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Theoretical Strength of Face-Centred-Cubic Single Crystal Copper Based on a Continuum Model |
| LIU Xiao-Ming, LIU Zhan-Li, YOU Xiao-Chuan, NIE Jun-Feng, ZHUANG Zhuo |
| School of Aerospace, Tsinghua University, Beijing 100084 |
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| Cite this article: |
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LIU Xiao-Ming, LIU Zhan-Li, YOU Xiao-Chuan et al 2009 Chin. Phys. Lett. 26 026103 |
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Abstract The constitutive relation of single crystal copper based on atomistic potential is implemented to capture the nonlinear inter-atomic interactions. Uniaxial loading tests of single crystal copper with inter-atomic potential finite-element model are carried out to determine the corresponding ideal strength using the modified Born stability criteria. Dependence of the ideal strength on the crystallographic orientation is studied, and tension-compression asymmetry in ideal strength is also investigated. The results suggest that asymmetry for yielding strength of nano-materials may result from anisotropic character of crystal instability. Moreover, the results also reveal that the critical resolved shear stress in the direction of slip is not an accurate criterion for the ideal strength since it could not capture the dependence on the loading conditions and hydrostatic stress components for the ideal strength.
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| Keywords:
61.50.Ah
62.20.Fg
34.20.Cf
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Received: 09 September 2008
Published: 20 January 2009
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| PACS: |
61.50.Ah
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(Theory of crystal structure, crystal symmetry; calculations and modeling)
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62.20.fg
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(Shape-memory effect; yield stress; superelasticity)
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34.20.Cf
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(Interatomic potentials and forces)
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