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SUMMARY:Initiation and crack growth with the Thick Level Set damage model 
 coupled to the eXtended Finite Element Method
DTSTART:20140509T121500
DTEND:20140509T131500
DTSTAMP:20260511T193059Z
UID:3bff52e0d11bffa4a1ebd54fd1eedee4d1f913e495bfc02538665fbc
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Nicolas Moës (Ecole Centrale de Nantes)\nCrack initiati
 on relies mainly on damage mechanics whereas crack propagation relies on f
 racture mechanics involving displacement discontinuity across a propagatin
 g crack. We propose a new model bridging these two mechanisms. Damage is e
 xpressed in terms of an evolving level set. In the wake of the front (iso-
 zero of the level set) damage is directly related to the distance of the f
 ront with a function considered as a material data. The new model is coine
 d Thick Level Set because not only the location of the iso-zero is useful 
 but all values up to the critical distance (lc) beyond which the material 
 is considered fully damaged (d=1). In the TLS model\, the crack location i
 s defined as the set of points located further than the critical distance 
 to the front. The crack placement in the damage band is thus part of the m
 odel.\nFrom a numerical point of view\, once a crack appears in the simula
 tion (appearance of an iso-lc)\, it is taken into account with the eXtende
 d Finite Element Method: displacement are allowed to be discontinuous acro
 ss the iso-lc through the use of an Heaviside enrichment (or several Heavi
 side enrichments in the case where the support is cut into several pieces)
 . Because of this enrichment\, the mesh may be coarsen away from the evolv
 ing damage zones.\nSeveral numerical experiments in 2D and 3D quasi-static
  and dynamic simulations of quasi-brittle failure will demonstrate the cap
 abilities of the TLS regarding initiation\, branching and propagation of c
 racks over long distances.\nBio: Dr. Nicolas Moës is professor of mechani
 cal engineering at Ecole Centrale de Nantes\, France\, since 2001. He obta
 ined his Ph.D. from the Ecole Normale Supérieure de Cachan and then spent
  several years at University of Texas Austin and Northwestern University w
 here he was appointed as research assistant professor. Prof. Moës is a fe
 llow member of the International Association for Computational Mechanics a
 nd the recipient of several awards including the Silver Medal from the CNR
 S in 2014 and an ERC advanced grant in 2012.
LOCATION:GC C330
STATUS:CONFIRMED
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