Molecular dynamics investigation of the effect of the interatomic potential on steady-state crack propagation

We present molecular dynamics simulations examining the effect of the interatomic potential on steady-state mode I crack propagation in a two-dimensional triangular lattice as a function of applied strain. The interatomic potential is the Morse potential whose failure strain exhibits linear variatio...

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Published inJournal of the Chinese Institute of Engineers Vol. 27; no. 6; pp. 883 - 887
Main Authors Kimmer, Christopher J, Zimmerman, Jonathan A, Klein, Patrick A, Chen, Er-Ping
Format Journal Article
LanguageChinese
Published 01.10.2004
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Summary:We present molecular dynamics simulations examining the effect of the interatomic potential on steady-state mode I crack propagation in a two-dimensional triangular lattice as a function of applied strain. The interatomic potential is the Morse potential whose failure strain exhibits linear variation with its exponentialparameter. The limiting crack speed is defined to be the steady-state crack velocity observed at the onset of instability in steady-state crack propagation leading to dislocation nucle-ation or crack branching. For all systems studied, the limiting crack speed is observed to be less than one third the Rayleigh wave speed. The fastest crack propagationin these ideal systems is associated with a material's long-wavelength elastic properties being dominated by the strength of the nearest-neighbor bond.
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ISSN:0253-3839