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SUMMARY:The Inequality Level Set\, a novel approach to handle variational 
 inequalities : application to contact
DTSTART:20160428T121500
DTEND:20160428T131500
DTSTAMP:20260924T123552Z
UID:6018415e8eb53517602201aecb752f99578faa22297e15b5a226380b
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Dr Nicolas Moës\, Ecole Centrale de Nantes\, France & r
 esearcher at GeM (Research Institute for Civil and Mechanical Engineering)
 \nThe key idea of the ILS for variational inequalities is to try to locate
  with a level set the domain over which the inequality reaches an equality
 . For contact problem\, it means that the main unknownis the contact zone.
  This is an important departure from classical contact algorithm since at 
 any iteration an explicit contact contour is known as a level set. A true 
 Newton-Raphson may thus be built with respect to the contact location. The
  derivative of the energy with respect to the contact zone location has th
 e meaning of a configurational force. For frictionless contact it must be 
 driven to zero to reach the exact contact zone\, whereas in case of adhesi
 on the force must correspond to the adhesion level.\nThe two main advantag
 es of the ILS are : possibility to enrich with the XFEM the contact zone b
 oundary to capture non-smoothness of the displacement field (higher order 
 order of convergence contact is thus at hand) and robustness in the iterat
 ive process since it is based on a full Newton-Raphson.\nExamples of simul
 ation of contact of membranes or deformable bodies on a rigid obstacle wil
 l show the capabilities of the ILS.\nNicolas Moës\, Nicolas Chevaugeon an
 d Matthieu Graveleau\, Ecole Centrale de Nantes\, UMR CNRS\, Nantes\, Fran
 ce\nReferences\nBonfils\, N.\, Chevaugeon\, N.\, & Moës\, N. (2012). Trea
 ting volumetric inequality constraint in a continuum media with a coupled 
 X-FEM/level-set strategy. Computer Methods in Applied Mechanics and Engine
 ering\, 205-208\, 16–28. doi:10.1016/j.cma.2011.02.012\nGraveleau\, M.\,
  Chevaugeon\, N.\, & Moës\, N. (2015). The Inequality level-set approach 
 to handle\ncontact: membrane case. Advanced Modeling and Simulation in Eng
 ineering Sciences\, 2:16.\nBio : Nicolas Moës is full Professor at the Ec
 ole Centrale de Nantes (France) since 2001 and researcher at the GeM (rese
 arch institute for civil and mechanical engineering).\nHe recieved his phd
  in 1996 from Ecole Normale Supérieure de Cachan after which he did spend
  5 years in the USA under the supervizion of Professors Oden and Belytschk
 o. He is one of the co-inventor of the eXtended Finite Element Method (X-F
 EM) for fracture mechanics and for other applications like material interf
 aces.\nHis current areas of interest are damage to fracture transition and
  contact algorithms. He received the young investigator award from the IAC
 M (International Association for computational Mechanics) in 2006 and was 
 declared IACM fellow in 2008. In 2014\, he received the silver medal from 
 CNRS.
LOCATION:GC B3 30 http://plan.epfl.ch/?lang=fr&room=GCB330
STATUS:CONFIRMED
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