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SUMMARY:Generalized Continuum Modelling of Grain Size Effects in Polycryst
 als
DTSTART:20120515T131500
DTEND:20120515T141500
DTSTAMP:20260510T001755Z
UID:f0cc8ddc7c8890dd6a06daba75397c336cd4ef52bbd388efeb9dc7f6
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Samuel Forest\, Ecole des Mines\, Paris\nThe effect of t
 he dislocation density tensor is introduced into the classical crystal pla
 sticity framework by means of the micromorphic theory of single crystals. 
 A computational homogenization strategy is presented in order to describe 
 the global and local responses of two--dimensional polycrystalline aggrega
 tes for grain sizes ranging from 1 to 200 microns. The model is shown to n
 aturally predict a size--dependent kinematic hardening behavior which is r
 esponsible for the observed strong size effects. The yield stress at a giv
 en averaged plastic strain is shown to follow a power law scaling relation
  for grain sizes larger than a critical one. The field of plastic deformat
 ion is also strongly affected by grain size\, whereby micron--size grains 
 lead to the formation of intense slip bands crossing several grains.
LOCATION:Me B3 31 http://plan.epfl.ch/?lang=fr&room=ME+B3+31
STATUS:CONFIRMED
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