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We investigate the mechanisms of prismatic loop formation, motion, interactions, and large-scale patterning in fcc metals utilizing Discrete Dislocation Dynamics (DDD). We identify two main formation mechanisms; both enabled by cross-slip of screw dislocations. The first is termed Super-Jog-Drag-Truncation (SJDT), and the second is the Offset-Double-Cross-Slip (ODCS) mechanism. DDD simulations show...
Numerous experimental observations have recently demonstrated two aspects of sub-micron plasticity in nano pillars: (1) the statistical nature of the yield strength, and (2) the existence of dynamic temporal oscillations in the hardening regime. The present work is focused on the second aspect, where we study strain avalanches in nickel nano pillars via a series of 3-D dislocation dynamics (DD) simulations...
We present a self-contained review of the discrete dislocation dynamics (DDD) method for the numerical investigation of plasticity in crystals, focusing on recent development and implementation progress. The review covers the theoretical foundations of DDD within the framework of incompatible elasticity, its numerical implementation via the nodal method, the extension of the method to finite domains...
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