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SUMMARY:Grains\, interfaces and size effects in metal forming - Dr Daniel 
 Balint\, Imperial College
DTSTART:20110211T140000Z
DTEND:20110211T150000Z
UID:TALK28572@talks.cam.ac.uk
CONTACT:Ms Helen Gardner
DESCRIPTION:A range of problems relevant to metal forming will be discusse
 d\, where grain characteristics (size\, regularity\, relative orientation)
 \, or second phase interfaces play an important role in the deformation\, 
 in some cases leading to size effects. Applications will include micro-pin
  extrusion\, micro-tube hydroforming\, warm sheet forming (e.g. stamping\,
  superplastic forming) and hot rolling. A selection of modelling methods c
 apable of capturing some of the effects of microstructure in metal forming
  will be used in corresponding simulations\, including a crystal plasticit
 y extended finite element method\, crystal plasticity equations calibrated
  by discrete dislocation simulations and a concurrent coupling of discrete
  dislocation plasticity and a crystal plasticity finite element method. Al
 gorithms recently developed for the generation of microstructures will als
 o be presented\, based on a controlled Poisson Voronoi tessellation determ
 ined by a unique mapping between parameters obtained from physical microst
 ructures and the virtual grain distribution\, with interfaces modelled by 
 cohesive zones\; adaptation of the algorithms for creating continuously gr
 aded microstructures\, such as locally recrystallised or case hardened mat
 erial\, will be demonstrated. The grain structure generation software will
  be used as a pre-processor in many of the metal forming simulations. Limi
 tations of the cohesive zone approach for interfaces will also be highligh
 ted as motivation for the further development of extended finite element m
 ethods for microstructure modelling.
LOCATION:Oatley Seminar Room\, Department of Engineering
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