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SUMMARY:On the identification of material parameters based on full-field m
 easurements 
DTSTART:20140122T140000
DTSTAMP:20260408T074600Z
UID:0e2fb2740c290c2d2f8003ced54d346b95f49aa49a095fd28e592a9e
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Gilles Lubineau\, PSE Division\, KAUST\, Saudi Arabia\nB
 io: Prof Gilles Lubineau is the principal investigator for COHMAS (COmposi
 te and Heterogeneous Materials Analysis and Simulation)\, an  integrated 
 environment for  composite engineering that  he  created in  2009  wh
 en joining KAUST as  an Associate Professor. Current research interests i
 nclude: integrity at  short and/or  long -term of  composite materials 
 and\nstructures\, inverse problems for the identification of constitutive 
 parameters\, multi-scale coupling technique\, multifunctional\nmaterials a
 nd modeling.\nBefore joining KAUST\, Pr. Lubineau was a faculty member at 
 the École Normale Supérie ure of Cachan\, and a non-resident faculty mem
 ber at the École Polytechnique\, France. He also served as a visiting res
 earcher at UC -Berkeley.\nHe served as program chair of the Mechanical Eng
 ineering program at Kaust from 2009 to 2012 and as chair of the Mas ter of
 \nMechanical Enginnering at ENS Cachan from 2005 to 2007.\nProf. Lubineau 
 earned a PhD degree in Mechanical Engineering from École Normale Supérie
 ure de Cachan (ENS -Cachan)\, France. He was ranked 1st at the agrégation
  in theoretical mechanics and was gra nted his research habilitation in Me
 chanics in 2008. He received the Daniel Valentin Award for best innovative
  works related to the field of composite materials in 2004.\nThe constitut
 ive compatibility method: concept and challenges\nThe robust and low-cost 
 identification of local material parameters in heterogeneous continua is a
  key step for accurately feeding advanced simulations of complex microstru
 ctures. Classical testing procedures  that  rely  as  much  as  poss
 ible  on homogeneous  mechanical  fields  only  give  access  to\na
 veraged quantities at the scale of the specimen.\nA way to experimentally 
 obtain more local information is to capture the heterogeneous kinematics (
 typically the heterogeneous displacement field). This makes Image-based te
 chniques the perfect  tool  for  studying  heterogeneous  structures.
   The  challenge  is  then  to  design  a  relevant inversion tech
 nique to recover the local material parameters from this enriched informat
 ion.\nWe focus here on the CEGM\, which\, unlike other methods\, considers
  the constitutive equation in a weak manner as a guiding norm for the iden
 tification.\nFirst\, we will discuss about the local identification of lin
 ear elastic behaviors. We propose a technique to uncouple the solution pro
 cess into a global optimization over a specific stress space so called the
  ``solution stress space"\, followed by a local estimation of the material
  parameters in a strong manner at any point of interest in the domain. The
  proposed '``constitutive compatibility technique"\, leads to two major ad
 vantages: (1) a drastic reduction in the computation cost (2) an ability t
 o easily determine points where the identified parameters are non-unique.\
 nSecond\, we introduce a domain decomposition technique in the CCM framewo
 rk. While plenty of work has been carried out on domain decomposition for 
 forward problems\, there is at our best knowledge no literature related to
  the development of domain decomposition technique specifically designed f
 or DIC-based inverse problems. To address this\, this talk describes the d
 evelopment of the domain decomposition CCM for more computationally effici
 ent identification in the case of larger problems.
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STATUS:CONFIRMED
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