Crack in solid tend to propagate under applied stress, either in purely brittle or blunting of the crack by emission of dislocations. This is dependent on the characterizes of the solid. Dislocation nucleation is a process susceptible to thermal activation.
Molecular dynamics simulation were performed for fcc aluminum lattice to study the effect of temperature and the strain on crack propagation in (111) plane. Two-dimensional lattice consists a crack in the  direction with Mores interatomic potentional between atoms were used.
The ideal lattice was consists of 3911 atoms and the periodic boundary conditions were used. The crack velocity and the lattice deformation were showed under different ranges of temperatures.
The crack motion was perpendicular to tension stress in the  direction and the crack tip speed and the lattice deformation were measured at each 0.45 ps.
From the simulation results it were found that the crack propagated in ductile behavior under different ranges of temperatures.
N. Y. Gorge
Altai State Technical University
Komsomolisky 71, Room 423
Barnaul, Altai 656099, RUSSIA