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SUMMARY:Probabilistic Fracture Mechanics and Its Implications on Ice - Sze
  Dai Pang (National University of Singapore)
DTSTART:20171204T113000Z
DTEND:20171204T123000Z
UID:TALK96034@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Quasibrittle materials are materials in which the fracture pro
 cess zone (FPZ) is not negligible as compared with the cross section dimen
 sion and encompass a wide variety of materials such as concrete\, mortar\,
  rocks\, toughened ceramics\, frozen sand\, and ice also belongs to this c
 lass of materials. The size of the FPZ is typically 5-50 times the size of
  the dominant material inhomogeneity and for ice\, it could be the grain s
 ize. For type 1 size effect which occurs in positive geometry structures f
 ailing at macrocrack initiation and is typical of flexural failures\, the 
 size effect is governed by Weibull statistics when the structure size dwar
 fs the size of the FPZ.  When the structure size is comparable to the size
  of the FPZ\, the probability distribution of the quasibrittle fracture ca
 n be described by a Gaussian core with a far-left Weibull tail. This is co
 ncluded from scaling laws derived from a hierarchical model of chains and 
 bundles of representative volume elements starti ng from the atomic scale 
 and include the effects of loading rate and temperature. The implications 
 of probabilistic fracture mechanics on the strength of ice are investigate
 d for different size of the ice sheet\, varying strain rates and temperatu
 re effect.
LOCATION:Seminar Room 1\, Newton Institute
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