Strain Hardening and Character Analysis of Discrete Dislocation Networks with Friction Stress Anisotropy
John Shimanek, Pennsylvania State University
The dynamics of two-dimensional defects within crystalline materials dictates their bulk plastic deformation response over a wide range of strain rates. In turn, the motion of these dislocations is associated with both atomic scale properties and longer range elastic and topological interactions amongst themselves. Motivated by the elastic anisotropy of face-centered cubic materials, the present work uses discrete dislocation dynamics simulations to probe the effect of character anisotropy in the friction stress required to move dislocations. The analysis spans one percent uniaxial elongation over twenty initial simulation configurations, assessing length and dynamics as functions of character. Bulk strain hardening is related to network features through the analysis of structured data output and comparison to classical homogenization perspectives.