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SUMMARY:Dynamic instabilities at interfaces: from contact lines to fractur
 e mechanics
DTSTART:20160203T140000
DTEND:20160203T150000
DTSTAMP:20260407T084921Z
UID:3dcb432e70f6ef84af1ac17c8b2dcc85808e2ba3a4c20cdcf1d0d9a8
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. John Kolinski\, Hebrew University of Jerusalem\, Israel\nB
 io : John Kolinski studied Applied Mathematics (Sc.M. 2010) and Applied Ph
 ysics (Ph.D. 2014) at Harvard University\, completing a PhD under the supe
 rvision of L. Mahadevan and Shmuel Rubinstein on the role of air in drople
 t impact. John is presently a Fulbright post-doctoral fellow with Eran Sha
 ron and Jay Fineberg at the Hebrew University of Jerusalem\, where his res
 earch is focused on interfacial instabilities in soft matter.\nAbstract :\
 nThe mechanics of fluids and solids at a material interface are often dyna
 mic\, and prone to developing instabilities. Here\, we experimentally stud
 y two different forms of interfacial instability: dynamic wetting beneath 
 an impacting drop\, and the propagation of a crack through a solid materia
 l. While both of these cases permeate our existence\, they remain poorly u
 nderstood due to the complexity of dynamics at the interface. As an impact
 ing a drop nears the surface\, the air fails to drain and is instead compr
 essed. We directly measure the liquid-air interface on the nanometer-scale
 \, and show how the air mediates the growth of liquid-solid contact\, lead
 ing to an unexpected contact line velocity. Separately\, we investigate ho
 w material inhomogeneity can alter the dynamic fracture of brittle materia
 ls. We controllably modify the constituents of our material sample\, load 
 it in tension\, and image it after a crack initiates. We will show that th
 e material’s inhomogeneity can destabilize the crack front during dynami
 c fracture\, diverting it from the plane of propagation.
LOCATION:Auditorium A. Palaz http://plan.epfl.ch/?zoom=20&recenter_y=58640
 06.31323&recenter_x=730999.51717&layerNodes=fonds\,batiments\,labels\,info
 rmation\,parkings_publics\,arrets_metro\,transports_publics&floor=0&q=me_d
 0%201418
STATUS:CONFIRMED
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