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SUMMARY:CESS Seminar : Stability Problems in Mechanics: Multiphysics & Mul
 tiscale Aspects (A Mechanician’s Perspective…)
DTSTART:20231201T121500
DTEND:20231201T131500
DTSTAMP:20260507T210516Z
UID:437c8027929391cfa21aea1ded965650bcadb0e9594b0a2765600ac9
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Nicolas Triantafyllidis\, École Polytechnique\, Palaise
 au\nAbstract:\nStability is a fascinating topic in solid mechanics that ha
 s its roots in the celebrated Euler column buckling problem\, which first
  appeared in 1744. Over the years advances in technology have led to the s
 tudy of ever more complicated structures\, first in civil and subsequentl
 y in mechanical engineering applications. Aerospace applications\, most no
 tably failure of solid propellant rockets\, led the way in the 1950s. Prob
 lems associated with materials and electronics industries came on stage in
  the 1970s and 1980s\, starting with instabilities associated with thin 
 films and phase transformations in shape memory alloys (SMA’s)\, just t
 o name some of the most preeminent examples. In a parallel path\, starting
  in the late 19th century\, mathematicians studying nonlinear differentia
 l equations\, developed the concept of a bifurcation (term coined by Poinc
 are) and created powerful techniques to study the associated singularities
 \, followed by advances in group-theoretical methods that exploit the prob
 lem’s underlying symmetries. Amazing progress has been made since the ea
 rly days of structural buckling problems and continues to be made in this 
 field\, with applications ranging from atomistic to geological scales. Wi
 th the advent of new materials\, the number of applications in this area c
 ontinues to progress with an ever- increasing pace.\n\nIn this talk we pre
 sent selected applications of stability problems involving phenomena a) ac
 ross spatial scales and b) driven by multi-physics coupling. In the first 
 class of applications\, we visit – by decreasing the size of the underly
 ing scale – the instabilities occurring in fiber reinforced composites\,
  honeycomb\, and crystal lattices (shape memory effects). In the second cl
 ass\, we present stability problems in magnetoelastic thin films\, liquid 
 crystals\, and step-bunching in epitaxial thin film deposition. In all the
 se applications\, we use both continuum description of the problem at hand
  or appropriate micromechanical models and the mathematical tools of bifur
 cation theory and symmetry groups.\n\nShort bio\nProf. Nicolas Triantafyll
 idis obtained a Ph.D. in Engineering and an MS in Applied Mathematics from
  Brown University in 1980. The same year he joined the faculty of the Aero
 space Engineering Department at the University of Michigan in Ann Arbor\, 
 MI\, USA starting as an Assistant Professor and reaching the rank of Full 
 Professor in the Departments of Aerospace Engineering and Mechanical Engin
 eering & Applied Mechanics. He is currently an emeritus Professor of the U
 niversity of Michigan. In 2009 he moved to France to become CNRS Director 
 of Research in the Solid Mechanics Laboratory (LMS) and a Professor of Mec
 hanics at the Ecole Polytechnique\, where he is currently a member of the 
 Haut College.\n\nProf. Triantafyllidis’ research is in the area of nonli
 near continuum mechanics of solids and structures with emphasis on stabili
 ty\, scale effects and Multiphysics aspects. More specifically he has work
 ed on the following topics: Numerical methods (FEM)\; Finite strain proble
 ms in elasticity and plasticity related to metal forming\; Failure mechani
 sms in composites and architected materials\; Group theoretical methods in
  bifurcation and stability\; Multi-scale problems and related stability is
 sues in solid mechanics\; Phase transformations in SMA’s\; Magneto-elect
 ro-mechanical coupling problems in solids\; Electromagnetic forming and as
 sociated stability problems\; Stability of solids under high rates of stra
 in\; Mechanical effects in semiconductors\; Stability of structures under 
 high strain rates\; Magneto-rheological and nematic elastomers\; Liquid cr
 ystals\, Epitaxial growth on crystals and associated stability problems\; 
 Finite strain chemo-poro-mechanics and subcutaneous injection modeling.\n\
 nProf. Triantafyllidis has developed and taught a number of graduate and u
 ndergraduate courses in solid mechanics in the topics of stability of soli
 ds\, micromechanical theories of solids (homogenization techniques)\, plat
 e and shell theories\, numerical techniques (finite elements)\, shape memo
 ry alloys and coupled mechanical-electromagnetic field theories. He has su
 pervised the Doctoral Theses of several graduate students in the US and Fr
 ance. In addition\, Prof. Triantafyllidis has collaborated extensively wit
 h researchers on both sides of the Atlantic and has served\, through diffe
 rent functions\, the international solid mechanics community.\n\nSandwiche
 s offered after the seminar.
LOCATION:GC B1 10 https://plan.epfl.ch/?room==GC%20B1%2010 https://epfl.zo
 om.us/j/69022535167
STATUS:CONFIRMED
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