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SUMMARY:Propagating Instabilities in Materials
DTSTART:20180920T161500
DTEND:20180920T173000
DTSTAMP:20260406T020344Z
UID:9a6596ad5b13dc326de61840954075a5ed0cc2d6d9f85828192f191c
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Stelios Kyriakides\, Research Center for Mechanics of So
 lids\, Structures & Materials\, The University of Texas at Austin\nAbstrac
 t The onset of instability is one of the factors that limit the extent to
  which materials can be loaded or deformed. In some material systems\, ins
 tability leads to localization of deformation\, which after some growth\, 
 is locally arrested. However\, under prevailing conditions\, the local def
 ormation can propagate and potentially destabilize the whole material doma
 in. During the propagation of the instability\, highly deformed and relati
 vely undeformed “phases” co-exist. Furthermore\, the effort required t
 ends to remain essentially constant and lower than that needed to initiate
  the instability in the intact system. This presentation encompasses sever
 al material systems that exhibit this behavior known as propagating instab
 ility including: the evolution of Lüders banding in mild steels\, the evo
 lution of deformation associated with phase transformation in shape memory
  alloys\, the propagation of crushing in honeycombs and foams\, etc. The l
 ecture will use results from experiments and modeling to illustrate that\,
  although the physical micromechanical reasons that cause this behavior ar
 e different in each material system\, they share an underlying up-down-up 
 local response. How this guides their constitutive modeling will be demons
 trated using numerical results.\n\nBio Dr. Kyriakides received a B.Sc. de
 gree in Aeronautical Engineering with first class honors from the Universi
 ty of Bristol in the U.K.\, and M.S. and Ph.D. degrees in Aeronautics from
  the California Institute of Technology. He is Professor of Aerospace Engi
 neering and Engineering Mechanics at The University of Texas at Austin and
  holds the John Webb Jennings Chair in Engineering. Kyriakides' major tech
 nical interests are in the mechanics of solids\, structures and materials\
 , with an emphasis on instability at both the macro (structural) and micro
  (material) levels. His work is motivated by practical problems and usuall
 y involves combined experimental\, analytical and numerical efforts. He ha
 s more than 200 publications\, has co-authored one book\, and has lectured
  extensively both nationally and internationally. He has pioneered propaga
 ting instabilities in structures and materials and has maintained a long-t
 erm interest in plastic instabilities and crushing of structures\, plastic
 ity\, forming problems in manufacturing\, localization and ductile failure
  of metals\, the mechanical behavior of composites\, etc. He is recognized
  as a major contributor to these areas. He served as chair of the Executiv
 e Committee of the Applied Mechanics Division-ASME\, as President of the A
 merican Academy of Mechanics (AAM)\, as chair of the US National Committee
  of Theoretical and Applied Mechanics\, and is Editor of the International
  Journal of Solids and Structures. His recognitions include the 2009 Warne
 r T. Koiter Medal from the American Society of Mechanical Engineers (ASME)
 \, Member of the US National Academy of Engineering\, and Fellow of ASME a
 nd AAM.
LOCATION:MED 2 2423 https://plan.epfl.ch/?room=MED22423
STATUS:CONFIRMED
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