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National Repository of Grey Literature 1 records found  Search took 0.00 seconds. 
3D modelling of dislocation processes
 Záležák, Tomáš
Article presents a 3D model which describes a motion of discrete dislocations in a crystalline material at high temperatures. The dislocation curves are represented by straight line segments. The driving forces are determined by a Peach-Koehler formula which considers the self-stress and applied stress. The segment velocity is approximated by a temperature-dependent linear relation to the Peach-Koehler force. The model incorporates spherical precipitates. The model is also capable of adaptive adjustment of a time integration step and remeshing of the straight segment network. Topological changes (i. e. annihilation) are also included. The numerical integration takes advantage of the model symmetry to speed up the simulation process, save computer memory and reduce numerical errors. The model is applied to a system of coaxial dislocation loops in a field of spherical particles.
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