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SUMMARY:MechE Seminar: Probing cracks and contact at obscured interfaces w
 ith 3D microscopy
DTSTART:20240503T120000
DTEND:20240503T130000
DTSTAMP:20260506T045027Z
UID:1be4da5ceac7be473947e47bf83916c6ebcc87c4de8a0f4dee868271
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr John Kolinski\, EPFL EMSI \nAbstract: \n\nThe macroscopi
 c properties of materials and structures are used in the engineering desig
 n of myriad systems that are in fact controlled by processes at microscop
 ic scales. Examples include the initiation and propagation of cracks\, wh
 ich govern the ultimate strength of structures\, and the dissipation at th
 e edge of an advancing contact line that determines overall fluid motion. 
 These are examples of `propagating singularities\,’ where the stress div
 erges to infinity at the advancing crack or contact front. Fracture and co
 ntact processes invoke motion and stress across scales\, and are typically
  obscured by the bulk\; as a consequence\, such systems are challenging to
  characterize experimentally. In this talk\, I describe how we surmount th
 ese challenges with 3D imaging methods at the micro-scale. With these meth
 ods\, we identify the conditions required for contact formation beneath an
  impacting droplet\, and discover a quantitative connection between crack 
 front geometry and material toughness. I conclude with a discussion of how
  our observations about fundamental mechanical processes may be used in an
  engineering context.  \n\n\n\nBiography:\n\nDr. Kolinski studied Applie
 d Mathematics (Sc.M.) and Applied Physics (Ph.D.) at Harvard University un
 der the supervision of L. Mahadevan and Shmuel Rubinstein\, completing his
  thesis on the role of air in droplet impact. After completing his thesis\
 , John moved to the Hebrew University to continue research on interfacial 
 instabilities as a post-doc with Jay Fineberg and Eran Sharon. Currently\,
  Kolinski is a tenure-track assistant professor at EPFL\, where his lab pr
 obes the microscopic mechanisms governing the mechanical behavior of mater
 ials through 3D imaging of cracks and contact lines.\n\n 
LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418 https://epf
 l.zoom.us/j/64275993242
STATUS:CONFIRMED
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