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BEGIN:VEVENT
SUMMARY:MEchanics GAthering -MEGA- Seminar: Shell buckling revisited
DTSTART:20190418T161500
DTEND:20190418T173000
DTSTAMP:20260501T070950Z
UID:f832b559932c727099572d25b29e35a8f9254966f8cd5b22c03b5a9a
CATEGORIES:Conferences - Seminars
DESCRIPTION:Emilio José Lozano Vazquez\, ECPS\, EPFL & Dong Yan\, fleXLa
 b\, EPFL\nAbstract Shells buckle under compression load levels below the 
 thresholds predicted by linear stability analysis. The reduction of the lo
 ad-carrying capacity has been linked to extreme sensitivity to geometric i
 mperfections. Historically\, spatially extended periodic imperfections hav
 e been analyzed to mimic this behavior. Recent fully nonlinear analysis of
  the shell equations suggests however the importance of spatially localize
 d imperfections. We thus characterize experimentally and numerically the e
 ffect of spatially localized imperfections in an axially loaded cylindrica
 l shell. For different types of imperfections\, the buckling thresholds as
  a function of its size show similar behavior. This suggests a universal f
 ailure mechanism due to local buckling.\n\nThe sensitivity of buckling to 
 localized geometric imperfections has also been recognized in spherical sh
 ells. The distribution and interaction of defects dictate the buckling str
 ength of shell structures. To date\, the successful prediction of critical
  loads is restricted to cases with a single defect\, of known geometry. Ho
 wever\, in reality\, shells typically contain a distribution of defects an
 d their interaction has not been well studied. In this talk\, we will focu
 s on spherical shells with multiple defects and study the role of defect i
 nteractions in dictating the buckling pressure. Our results provide a bett
 er understanding of defect interactions\, which we hope will put us on a s
 tep to better predict the buckling pressure of practical shell structures.
LOCATION:MED 2 2423 https://plan.epfl.ch/?room=MED22423
STATUS:CONFIRMED
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