3D Discrete Dislocation Dynamics Simulations of Multiple Spiral Dislocation Sources

A spiral dislocation source is a dislocation with one end fixed on the slip plane, while the other end of the spiral dislocation source is at a grain boundary or a free surface. In the current study, 3D dislocation discrete dynamics (DDD) simulations, which is a simulation method that can emulate the collective motion of dislocations and predict the constitutive behavior of a crystalline material, is used to simulate, and capture the interaction between the spiral dislocation sources. The simulation results show that the flow stress in the computational domain is dependent of the number of spiral sources. Another important simulation result from the current study is that an edge FR source can be produced from two screw spiral dislocations that are moving in the same direction on the same slip plane.