The dynamic behavior of dislocations, near to a crack tip in a face-centered cubic lattice, was studied by using molecular dynamics simulation. This revealed 3-dimensional features of dislocation nucleation and subsequent entanglement. The results obtained for Cu and Al revealed the multiple emission of dislocation loops from the crack tip, and the incipient evolution of plastic deformation during crack extension. It was found that <100> dislocations were emitted in Al at 0K, but these were unstable and dissociated into bundles of <110> dislocations.

Crack-Tip Dislocation Nanostructures in Dynamic Fracture of FCC Metals - a Molecular Dynamics Study. H.Kimizuka, H.Kaburaki, F.Shimizu, J.Li: Journal of Computer-Aided Materials Design, 2003, 10[2], 143-54