Atomistic studies of crack stability in bulk materials and at interfaces

A. E. Carlsson, Robb Thomson, S. J. Zhou

Research output: Contribution to journalConference articlepeer-review


A series of atomistic simulation studies of dislocation emission and cleavage at crack tips in a model two dimensional hexagonal lattice is performed using the lattice Green's function method. Both bulk materials and interfaces are treated. The results are strongly dependent on the direction of emission. For Mode II emission (parallel to the crack plane), emission in both bulk and interface systems is well described by the shearing energy at the crack tip. For Mode I emission, in which new surface is created with the emerging dislocation, the shearing energy is insufficient, and a contribution from the surface energy must be included. We find that the observed emission stress-intensities are strongly correlated with the surface energy, if it is not too small. We also examine several interface-specific effects. Unphysical displacement oscillations which are found in continuum-elastic analyses are eliminated by shear breakdown of the bonds at the crack tip.

Original languageEnglish
Pages (from-to)51-63
Number of pages13
JournalAmerican Society of Mechanical Engineers, Applied Mechanics Division, AMD
StatePublished - 1995
EventProceedings of the 1995 Joint ASME Applied Mechanics and Materials Summer Meeting - Los Angeles, CA, USA
Duration: Jun 28 1995Jun 30 1995


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