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SUMMARY:Intermittency and localization in compressive failure of heterogen
 eous materials
DTSTART:20170331T121500
DTEND:20170331T130000
DTSTAMP:20260501T134108Z
UID:d675c0b7ee7e5420876a6a803841fb29bc62963aed36896332a52751
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Laurent Ponson\, Institut Jean le Rond d’Alembert\, UPMC 
 – CNRS\, Paris\, France\nAbstract:\nBeyond some critical load\, solids u
 nder traction break through the propagation of a crack. Under slowly incre
 asing compressive load\, the failure mode of materials turns out to be qua
 litatively different: They first damage rather homogeneously until the eme
 rgence of a thin localization band where most fracture mechanisms subseque
 ntly concentrates. The specimen then loses its ability to carry mechanical
  load through sliding along the newly created fault.\n \nTo predict local
 ization and ensure the mechanical integrity of structures\, current models
  build on damage mechanics that describe the evolution of damage in a cont
 inuum homogeneous medium. However\, this approach relies on the ad hoc int
 roduction of non-local effects that control the localization threshold and
  so the bearing load capacity. Moreover\, these models overlook the centra
 l role played by the microstructural heterogeneities at the origin of the 
 strong intermittent mechanical response observed prior localization and th
 e size effects characterizing the failure behavior of materials under comp
 ression. During this seminar\, I will address these challenges through the
  study of damage spreading and localization in heterogeneous solids. First
 \, this will reveal the mechanism at the origin of the non-local behavior 
 of damaging solids\, namely the process of load redistribution taking plac
 e in elasto-damageable media after any single damage event. We will show h
 ow to use this process as a building block to predict localization\, but a
 lso to rationalize the giant fluctuations observed during the phase of pro
 gressive damage preceding failure. Finally\, I will show how this extensio
 n of damage mechanics to heterogeneous solids may be used to predict the e
 mergent properties of quasi-brittle solids from their microstructural feat
 ures. For pedagogical purposes\, the theoretical concepts introduced durin
 g this seminar will be illustrated through experiments performed on model 
 heterogeneous solids.\n\nShort Bio:\nDr Laurent Ponson is chargé de Reche
 rche CNRS at the Institut Jean Le Rond d’Alembert of the University Pier
 re & Marie Curie in Paris (Paris 6)\, France. Laurent graduated from Ecole
  Centrale in 2003 and obtained his PhD in Physics from Ecole Polytechnique
 \, France in 2006. His research interests cover the topics of complexity i
 n solid mechanics\, fracture and damage mechanics as well as out-of-equili
 brium statistical physics.  \n 
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STATUS:CONFIRMED
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