Fundamentals of Dislocation Dynamics Simulations

Dislocation dynamics (DD) is a modeling approach for the study of crystal plasticity wherein individual dislocation lines are discretized and their motion in the crystal is simulated. This chapter provides an overview of the basic features of the DD methodology and a guide for how to run DD simulations. Each of the basic building blocks, in terms of both dislocation physics and numerics, is first discussed. Three case studies are then presented, showing how to set up a simulation, ensure solution convergence, and extract key outputs. The major DD codes are briefly reviewed, discussing their major features and differences. Finally, the relation of DD to material models at other length and time scales is discussed, along with current challenges and research topics.