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New algorithms for modeling high homologous temperature plastic deformation

Run Zhu (Northeastern University), Srinath Chakravarthy (Northeastern University)

Discrete Dislocation Plasticity

Tue 2:40 - 4:00

RI Hall 108

A set of new algorithms are presented to model the motion of dislocations under a combination of thermal and mechanical loading. The main assumption is that dislocation glide occurs on time scales much smaller than all other events controlling dislocation motion. Thus dislocation glide can be modeled by determining their equilibrium position. This is achieved by minimizing the total interaction energy of the dislocations which accounts for long range interactions between dislocations. Short range interactions are modeled as discrete events. Such an event based approach allows decoupling of time scales associated with dislocation glide and consequently gives access to modeling at strain rates that are of interest in practical applications. In addition, access to broader time scales allows simulation of thermal events that previous dynamics simulations were incapable of modeling. We present several examples comparing our new quasi-static method with full dynamics simulations under mechanical loading.