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SUMMARY:Damage hybrid and meso-modelling of composite: the framework and s
 ome complement to deal with impact and energy absoption
DTSTART:20141107T121500
DTEND:20141107T131500
DTSTAMP:20260427T225226Z
UID:0ea3b53517d188ae334a1a1c84f97ae2e9ec9ff80e0f5171ecf79247
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Olivier Allix\, ENS Cachan\, France\nThe intensive use o
 f long-fibers composite laminates in aeronautics or automotive application
 s implies to master the prediction of any behaviour up to final failure. T
 he so-called virtual testing approach supports this goal and relies on the
  use of robust models for key physical mechanisms.\nFollowing the works of
  Ladevèze [1-2] and co-workers this presentation will rely on two types o
 f models to deal with:\n- hybrid model for material virtual testing of sma
 ll coupons\, where all possible cracks are introduced \;\n- an homogenized
  damage meso-model  for the virtual testing of larger specimens.\nMotivat
 ed by the virtual testing of energy absorbers the presentation will discus
 sed\, within those model frameworks\, the introduction of two particular a
 spects: the kinking phenomenon [3] and the rate dependent modelling of del
 amination [4]. The question of the objective simulation of erosion and fai
 lure of composite in dynamics by damage mechanics will also be discussed [
 5].\n[1] P. LADEVEZE\, G. LUBINEAU\, AND D. VIOLEAU. A computational damag
 e micromodel of laminated composites. International Journal of Fracture\, 
 137(1):139-150\, 2006.\n[2] LADEVEZE\, P.\, LUBINEAU\, G.\, MARSAL\, D. Mi
 cromechanics and Mesomechanics of Laminates: Synergy and Model Improvement
 s. Jounal of the Mechanical Behavior of Materials. Vol 19. Num 2-3. Pages 
 159-166. 2009\n[3]  ALLIX O.\, FELD N. \, BARANGER E.\, GUIMARD J-M & HA-
 MINH C.\, The compressive behaviour of composites including fiber kinking:
  modelling across the scales\, to appear in Meccanica 2014\n[4] GUIMARD\, 
 J.M.\, ALLIX\, O.\, PECHNIK\, N.\, THEVENET\, P. Characterization and mode
 ling of rate effects in the dynamic propagation of Mode-II delamination in
  composite laminates. Int Jal of Fracture. Vol 160. Num 1. Pages 55-71. 20
 09\n[5] ALLIX\, O. The bounded rate concept: a framework to deal with obje
 ctive failure predictions in dynamic within a local constitutive model. In
 t Jal of Damage Mechanics. Vol 22. Pages 808-828. 2013\nBio : Olivier Alli
 x is Professor (of Exceptional class) at the Ecole Normale Supérieure de 
 Cachan and previous director of LMT-Cachan and is member of the prestigiou
 s Institut Universitaire de France. Olivier Allix has worked intensively i
 n connection with Airbus and other companies on the modelling of the mecha
 nical behaviour of composites and the developement of multiscale strategie
 s to deal with those complex material and structures. He recently proposed
  non intrusive computational methods to easily implemnt those techniques i
 nto commercial packages. Olivier Allix serves as member of 12 editorial bo
 ards of international journals. He organized the Fourth European Conferenc
 e on Computational Mechanics in Paris in 2010 with more than 2000 particip
 ants and is an Euromech and IACM fellow.
LOCATION:GC C330 http://plan.epfl.ch/?lang=fr&room=GCC330
STATUS:CANCELLED
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