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SUMMARY:CESS Seminar: How moving cracks in brittle solids choose their pat
 h
DTSTART:20191129T121500
DTEND:20191129T130000
DTSTAMP:20261002T005349Z
UID:2c008e2074efbb92f421a5c2bccb471307d74167634703d437bcbeee
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Jay Fineberg\, the Racah Institute of Physics\, the Heb
 rew University of Jerusalem\nAbstract:\nWhile we have an excellent fundame
 ntal understanding of the dynamics and structure of cracks propagating in 
 brittle solids\, we do not fully understand how the path of a moving crack
  is determined.  Here we experimentally study cracks that are propagating
  between 10-95% of their limiting velocity within a brittle material. We d
 eflect these cracks by either allowing them to interact with sparsely impl
 anted defects or driving them to undergo an intrinsic oscillatory instabil
 ity in defect-free media. By dense measurements of the strain fields surro
 unding the crack tips via high speed imaging\, we determine what governs a
  crack’s direction when it is strongly deflected.  We reveal that the p
 aths selected by these rapid and strongly perturbed cracks are entirely go
 verned by the direction of maximum energy density and not by the oft-assum
 ed principle of local symmetry. This fundamentally important result may po
 tentially be utilized to either direct or guide running cracks.\n\nBio:\nP
 r. Jay Fineberg is professor at The Racah Institute of Physics\, The Hebre
 w University of Jerusalem. Pr. Jay Fineberg’s laboratory has a variety o
 f different research interests.  Each of these projects is interesting i
 n itself\, fundamentally important\, an intrinsically nonlinear process.
  Some of these\, in broad strokes\, are: (i) the physics of dynamic (rapi
 d) fracture in brittle materials\, (ii) the pattern formation and interact
 ions of nonlinear waves\, and (iii) the physics of the onset of frictional
  motion and laboratory modeling of earthquakes. Prof. Fineberg has publish
 ed over 100 research articles in the leading journals in the sciences and 
 Physics. 16 of his papers have been published in Nature or Science magazin
 es and about 40 in the Physical Review Letters.\n 
LOCATION:GC B3 31 https://plan.epfl.ch/?room==GC%20B3%2031
STATUS:CONFIRMED
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