Analysis of elastic stability and structural response of face-centered cubic crystals subject to [110] loading

The elastic stability and structural response of face-centered cubic crystals subject to uniaxial [110] loading are investigated systematically based on lattice-statics analysis, molecular-dynamics (MD) simulations, and symmetry and bifurcation considerations. The onset of instability in isostress M...

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Bibliographic Details
Published inApplied physics letters Vol. 89; no. 18; pp. 181907 - 181907-3
Main Authors Djohari, Hadrian, Milstein, Frederick, Maroudas, Dimitrios
Format Journal Article
LanguageEnglish
Published United States American Institute of Physics 30.10.2006
Subjects
BIFURCATION
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COPPER
CRYSTALS
DEFORMATION
EIGENFUNCTIONS
EIGENVALUES
FAILURES
FCC LATTICES
INSTABILITY
LOADING
MOLECULAR DYNAMICS METHOD
NICKEL
SIMULATION
STACKING FAULTS
TEMPERATURE DEPENDENCE
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Summary:The elastic stability and structural response of face-centered cubic crystals subject to uniaxial [110] loading are investigated systematically based on lattice-statics analysis, molecular-dynamics (MD) simulations, and symmetry and bifurcation considerations. The onset of instability in isostress MD simulations is found to be associated with loss or diminution of energy convexity (Born's stability criterion) as determined from computed strain and temperature dependent elastic moduli. Atomic mechanisms of crystal destabilization beyond the onset of instability are consistent with theoretical eigendeformations and are precursors to interatomic slip, which, in turn, may lead to failure or mechanical stacking faults.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2372703