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SUMMARY:Strain accommodation in kinking nonlinear elastic solids - Profess
 or Michel W Barsoum\, Department of Materials Science and Engineering\, Dr
 exel University
DTSTART:20151030T140000Z
DTEND:20151030T150000Z
UID:TALK61012@talks.cam.ac.uk
CONTACT:Ms Helen Gardner
DESCRIPTION:A decade or so ago we have identified a large class of solids 
 that we characterized as kinking nonlinear elastic\, KNE\, because the def
 ormation is elastic but nonlinear\, and\, in most cases\, is accompanied b
 y kink bands and/or kink boundaries.  The signature of KNE solids is the f
 ormation of fully\, and spontaneously\, reversible hysteretic stress-strai
 n loops. The energy dissipated per cycle can sometimes be substantial and 
 increases rapidly with applied stress. For example\, Ti3SiC2 – a MAX pha
 se – can be cyclically compressed to stresses of the order of 1 GPa\, wh
 ile dissipating 25 % of the energy during each cycle. In this talk I will 
 review the evidence - which includes TEM\, nanoindentation\, in situ neutr
 on diffraction\, EBSD among others – for kinking non-linear elasticity i
 n a large variety of solids\, including the MAX phases\, hexagonal metals\
 , mica\, LiNbO3\, sapphire\, graphite\, ZnO\, among others. I will also pr
 opose a number of possible micromechanisms that can be invoked to explain 
 this unusual mechanical response\, including a new micromechanism that is 
 distinct from dislocations. Given that a sufficient condition for a solid 
 to be KNE is plastic anisotropy – i.e. the confinement of the deformatio
 n to 2D – it follows that KNE solids are quite ubiquitous indeed\, while
  remaining under-appreciated.\n\n\nShort Bio\n\nProf. Michel W. Barsoum - 
 Distinguished Professor in the Department of Materials Science and Enginee
 ring at Drexel University - is an internationally recognized leader in the
  area of MAX phases. He is the author of two entries on the MAX phases in 
 the Encyclopedia of Materials Science and the book\, MAX Phases\, publishe
 d in 2013 by Wiley-Verlag. He is also the author of Fundamentals of Cerami
 cs\, a leading textbook in his field. In 2011\, he and Drexel colleagues s
 electively etched the A-group layers from the MAX phases to produce an ent
 irely new family of 2D solids - they labeled MXenes - that have sparked gl
 obal interest because of their potential in many applications\, least of w
 hich is energy storage. With over 350 refereed publications\, and a ISI h 
 index of 58\, his work has been highly cited. He is a fellow of the Americ
 an Ceramic Society and the World Academy of Ceramics. In 2000 he was award
 ed a Humboldt-Max Planck Research Award for Senior US Research Scientists.
  Since 2008 he has been a visiting professor at Linkoping University in Sw
 eden. He is currently spending part of his sabbatical year funded at Imper
 ial College in London\, funded in part by the Leverhulme Trust.
LOCATION:Cambridge University Engineering Department\, LR4
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