K. Les-paramètres-y-c and . Dans-leséquationsleséquations, 11) et (3.12) sont choisis identiques sur tous les systèmes de glissement et pour tous les grains

C. Au-paramètre and K. , la distance critique d'annihilation y c a peu d'effet sur le comportement mécanique pour de faibles déformations, et un effet important sur ce même comportement lorsque la déformation

. Dans-cette-section, orientation cristallographique et de la taille des grains sur le comportement mécanique des aciers IF1 et IF2 serontétudiés serontétudiés. Pour cela, des chargements de traction sont simulés jusqu'` a une déformation macroscopique de 10%. Les comportements macroscopiques en traction simple sont représentés sur la figure (3.12)

D. Côté, la prise en compte des longueurs internes peut s'effectuer en " discrétisant " les champs de déformation sur les grains

. Ce-type-d, L'avantage de cette formulation est de conna??treconna??tre les variations des champs mécaniques sur l'ensemble de la structure du grain, donc en tout point r du grain (champs complets) Ce type d'approche, combiné aux observations expérimentales [KWT05][RHJ96][SP08], engendre une seconde modélisation possible prenant en compte deux longueurs internes associées aux interactions entre les dislocations et les joints de grain

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