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SUMMARY:Contact\, cavitation and interfacial dislocations: Computer models
  for tribological processes
DTSTART:20161024T131500
DTEND:20161024T141500
DTSTAMP:20260414T105940Z
UID:30d5583e018c668af409ecfb71055063c467316ac45d7b555fa23658
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Lars Pastewka\, Karlsruhe Institute of Technology - German
 y\nTribology is the science of mechanical processes at material surfaces\,
  such as adhesion\, friction or wear. Studying these is complicated becaus
 e most surfaces are rough\, interact with lubricants\, water or air and be
 cause the interface between two materials is typically inaccessible to in-
 situ experimental techniques. In this talk\, I give examples of how comput
 er simulations at mesoscopic and atomic scales can help to elucidate the p
 rocesses that take place at these “buried interfaces”. Mesoscopic simu
 lations of elastic contact and plastic contact between rough surfaces allo
 w a direct calculation of the area of intimate atomic contact [1]. Condit
 ions within the contacting regions are typically extreme and give rise to 
 severe plastic deformation. I will then describe simulations of interfacia
 l effects that occur in the region of intimate atomic contact during shear
 . First\, lubricant flow on surfaces sticking and slipping regions reveal 
 how the material affects surface flow and that stick/slip contrast can lea
 d to cavitation within the lubricant [2]. Second\, in the absence of a lu
 bricant\, the sliding interface can accommodate shear by creating interfac
 ial dislocations that control the interfacial strength of the material [3
 ].\n[1] Pastewka\, Robbins\, PNAS 111\, 3298 (2014)\; Appl. Phys. Lett. 10
 8\, 221601 (2016) [2] Savio\, Pastewka\, Gumbsch\, Science Advances 2\, e1
 501585 (2016) [3] Sharp\, Pastewka\, Robbins\, Phys. Rev. B 93\, 121402(R)
  (2016)\n\n\nBio: Lars Pastewka received a PhD in Physics from the Univers
 ity of Freiburg after obtaining MScs in Physics and Microsystems Engineeri
 ng from North Carolina State University and the University of Freiburg\, r
 espectively. He carried out post-doctoral work at the Fraunhofer Institute
  for Mechanics of Materials and the Department of Physics & Astronomy at J
 ohns Hopkins University. In 2014 Pastewka joined the Institute for Applied
  Materials at Karlsruhe Institute of Technology where he is heading a rese
 arch group on modelling contact\, friction and wear. He has held Fulbright
  and Marie-Curie Fellowships and is currently an Emmy-Noether Fellow of th
 e German Science Foundation.
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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