3D Discrete Dislocation Modelling of High Temperature Plasticity

0359091 - ÚFM 2011 RIV CH eng J - Journal Article
Záležák, Tomáš - Dlouhý, Antonín
3D Discrete Dislocation Modelling of High Temperature Plasticity.
Key Engineering Materials. Roč. 465, - (2011), s. 115-118. ISSN 1013-9826.
[MSMF /6./ Materials Structure and Micromechanics of Fracture. Brno, 28.06.2010-30.06.2010]
R&D Projects: GA MŠMT OC 162
Institutional research plan: CEZ:AV0Z20410507
Keywords : discrete dislocation dynamics * high temperature deformation * meso-scale simulations of plasticity * diffusion
Subject RIV: BE - Theoretical Physics

A 3D model is presented that addresses an evolution of flexible dislocation lines at high temperatures. The model is based on the linear theory of elasticity. A smooth dislocation line is approximated by a piecewise curve composed of short straight dislocation segments. Each dislocation segment is acted upon by a Peach-Koehler force due to a local stress field. All segment-segment interactions as well as an externally applied stress are considered. A segment mobility is proportional to the Peach-Koehler force, temperature-dependent factors control climb and glide motion of the segments. The potential of the model is demonstrated in simulations of simple high temperature processes including interactions of dislocations with secondary particles.
Permanent Link: http://hdl.handle.net/11104/0196947