VTechWorks is currently undergoing indexing. There may be some unusual behavior with item visibility on February 24, 2018, until the index is complete.
Please contact firstname.lastname@example.org if there are continuing difficulties.
Dislocation pinning effects on fracture behavior: Atomistic and dislocation dynamics simulations
We introduce an approach in which results from atomistic simulations are combined with discrete dislocation dynamics simulations of crack-tip plasticity. The method is used to study the effects of dislocation pinning due to grain boundaries or secondary particles on the fracture behavior of aluminum. We find that the fracture resistance is reduced with decreasing pinning distance. The results show that the pinning of the dislocations causes a net decrease in the shear stress projected on the slip plane, preventing further dislocation emission. Semibrittle cleavage occurs after a certain number of dislocations is emitted.