Crack Tip Dislocation Nucleation in FCC Solids

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Abstract

We present results of molecular dynamic simulations aimed at examining crack tip dislocation emission in fee solids. The results are analyzed in terms of recent continuum formulations of this problem. In mode II, Au, Pd, and Pt displayed a new unanticipated mechanism of crack tip dislocation emission involving the creation of a pair of Shockley partials on a slip plane one plane below the crack plane. In mode I, for all the materials examined, Rice's continuum formulation [J. Mech. Phys. Solids 40, 239 (1992)] underestimated the stress intensity for dislocation emission by almost a factor of 2. Surface stress corrections to the emission criterion brought the agreement between continuum predictions and simulations to within 20%.

Original languageEnglish (US)
Pages (from-to)1700-1703
Number of pages4
JournalPhysical Review Letters
Volume82
Issue number8
StatePublished - Feb 22 1999

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crack tips
nucleation
continuums
formulations
rice
slip
cracks
simulation
molecular dynamics
predictions

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  • Physics and Astronomy(all)

Cite this

Crack Tip Dislocation Nucleation in FCC Solids. / Knap, J.; Sieradzki, Karl.

In: Physical Review Letters, Vol. 82, No. 8, 22.02.1999, p. 1700-1703.

Research output: Contribution to journalArticle

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