The defects in crystalline materials significantly affect the fracture behaviors. In this paper
molecular dynamics (MD) model using a potential of embedded atom method (EAM) has been
developed to investigate the effect of the major crystalline defects, stacking fault and edge dislocation,
on the crack propagation in Fe crystal. Six cases with different locations of stacking fault and edge
dislocation have been studied. The strain distribution in lattice aggregate was heterogeneous. The
dislocations were observed slipping along directions  and [-100] on the plane (100). Simulation
results showed that the location of the stacking fault and edge dislocation significantly influenced the
crack propagation speed.