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SUMMARY:Radioscopy of Fatigue Cracks
DTSTART:20140311T131500
DTEND:20140311T141500
DTSTAMP:20260930T202131Z
UID:d2d91698249c4d927b472cc4a81900740af62b75f4ca583b24e09f57
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. François Hild\, Laboratory of Mechanics and Technology\
 , Cachan (France)\nBio : François Hild is Research Professor at the Labor
 atory of Mechanics and Technology in Cachan (France).  He graduated from 
 École Normale Supérieure de Cachan in 1989.  He received his Ph.D. degr
 ees in Mechanical Engineering from the University of Paris 6 in 1992 and f
 rom the University of California in 1995\, and his habilitation from the U
 niversity of Paris 6 in 1998.  His research interests include advanced ex
 perimental techniques\, digital image and volume correlation\, identificat
 ion and validation procedures for material models.\nAbstract : 3D imaging 
 techniques (e.g.\, X-ray computed microtomography or XRCMT) of in situ mec
 hanical tests allow for the measurement of 3D displacement fields by resor
 ting to digital volume correlation.  More importantly\, it enables for th
 e identification of mechanical properties of opaque materials.  When usin
 g XRCMT reconstructed volumes\, measurement uncertainties and correlation 
 residuals are assessed when finite element based volume correlation is use
 d. In particular\, artifacts related to the use of lab tomographs are disc
 ussed.\nFor a tensile test of cracked cast iron sample imaged by XRCMT\, a
  fully coupled experimental / numerical procedure is based on an enriched 
 kinematic basis as in eXtended finite element analyses.  The crack surfac
 e\, crack front\, and stress intensity factor profiles are extracted from 
 the measured displacements and compared with numerical predictions.  It i
 s also possible to evaluate local crack propagation features by analyzing 
 different propagation steps.  This type of analysis shows that there are 
 direct ways to bridge the gap between experiments and simulations thanks t
 o consistent kinematic bases and identification procedures\, and opens the
  way for the validation of fracture laws and numerical models.
LOCATION:ME B1 10 http://plan.epfl.ch/?room=MEB110
STATUS:CONFIRMED
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