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SUMMARY:Modelling dislocation structures and size effects in deformed 
 bicrystal based on continuum approaches - Hanru Tan
UID:36060c94-64ee-4a47-8fce-96a72356f98f
DESCRIPTION:Hanru Tan WW8\, FAU 19. August 2025\, 15:00 WW8\, Fürth D
 islocation patterning and size effects present significant challenges 
 to conventional constitutive models in plasticity\, which typically la
 ck microscopic information. To address these limitations\, continuum d
 islocation dynamics has been developed as a physics-based framework fo
 r describing plastic deformation\, originally derived from discrete di
 slocation dynamics. In this study\, continuum dislocation dynamics is 
 applied to model dislocation motion in bicrystals\, incorporating orde
 r parameters inspired by the phase-field method to represent grain bou
 ndaries. For small grains\, dislocations are depleted from the grain i
 nterior and accumulate at grain boundaries\, leading to increased back
  stress and elevated local yield stress. This reproduces the experimen
 tally observed size effect\, in which finer grains exhibit higher stre
 ngth. In large grains\, dislocations self-organize into cell structure
 s\, and these patterns become smeared-out near grain boundaries. By co
 mbining formulation of order parameters and continuum dislocation dyna
 mics\, the present approach enables simulating dislocation motion in p
 olycrystals via continuum approaches\, extending physics-based plastic
 ity models to a broader range of materials.
DTSTART:20250819T130000Z
DTEND:20250819T140000Z
LOCATION:WW8\, Room 2.018-2\, Dr.-Mack-Str. 77\, Fürth
DTSTAMP:20260425T082843Z
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