BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:MechE Colloquium: Multiscale Mechanics of Metal Plasticity
DTSTART:20211116T121500
DTEND:20211116T131500
DTSTAMP:20260428T115501Z
UID:0d7829a84519c61c7f68a85403f69fcb88b39b5fdedf6dbd56fc17ea
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. William A. Curtin\, Laboratory for Multiscale Mechanics 
 Modeling (LAMMM)\, Institute of Mechanical Engineering (IGM)\, School of E
 ngineering (STI)\, EPFL\nAbstract:\nDue to their many attractive propertie
 s\, especially plastic flow and consequent good ductility\, metals are use
 d in applications spanning the domains of Mechanical\, Aerospace\, and Civ
 il Engineering.  The performance of metals depends\, however\, on materia
 l features across a wide range of scales\, from macroscopic polycrystals d
 own to the individual dislocations that carry the plastic displacements th
 at generate macroscopic plasticity.  Understanding and predicting the mec
 hanical properties of metals is thus intrinsically a multiscale problem. 
  After examining the general philosophy of multiscale modeling of mechanic
 al properties\, we examine (i) how metal plasticity is currently modeled a
 t successively smaller scales\, and (ii) why or when one must progress to 
 lower scales that ultimately reach the domain of quantum mechanics.  We t
 hen note that fundamental mechanics principles are used at each scale of i
 nvestigation\; continuum\, mesoscale\, atomistic\, statistical and quantum
  mechanics tools are all “mechanics”.  This puts mechanicians in exce
 llent position to use the full range of tools to solve challenging technol
 ogical problems.  As one specific example\, we outline a multiscale model
  for mechanistic understanding and quantitative prediction of dynamic stra
 in aging phenomena that limit the macroscopic ductility of the technologic
 ally valuable Aluminum Al-5xxx alloys.  The underlying dynamic phenomenon
  is atomistic\, and requires quantum mechanics for quantitative accuracy.
   But the effects of the underlying mechanism must be carried up to the s
 cale of dislocation motion and dislocation interaction\, from which a full
  transient thermo-kinetic constitutive model can be derived.  Such models
  must then be implemented in continuum finite element models to reveal how
  the atomistic phenomenon leads to reduced macroscopic ductility of standa
 rd test coupons over a range of temperatures and strain rates.  This mech
 anistic insight across scales enables the computationally-guided search fo
 r new alloys that will have higher ductility which widens the domain of ap
 plicability of these desirable lightweight metals.\n\nBio:\nProfessor Curt
 in earned a 4 yr. ScB/ScM degree in Physics from Brown University in 1981 
 and a PhD in theoretical physics from Cornell University in 1986.  He wor
 ked as staff researcher at British Petroleum until 1993 and then joined Vi
 rginia Tech as an Associate Professor in both Engineering Mechanics and Ma
 terials Science.  In 1998 he returned to Brown as Full Professor of Engin
 eering in the Solid Mechanics group\, where he was appointed Elisha Benjam
 in Andrews Professor in 2006.  He joined Ecole Polytechnique Federale de 
 Lausanne as the Director of the Institute of Mechanical Engineering in 201
 1 and officially as Full Professor in 2012.  His research successes inclu
 de predictive theories of optical properties of nanoparticles\, statistica
 l mechanics of freezing\, hydrogen storage in amorphous metals\, strength 
 and toughness of fiber composites\, dynamic strain aging and ductility in 
 lightweight Al and Mg metal alloys\, solute strengthening of metal alloys 
 including high entropy alloys\, and hydrogen embrittlement of metals\, alo
 ng with innovative multiscale modeling methods to tackle many of these pro
 blems.  Professor Curtin was a Guggenheim Fellow in 2005-06\, was Editor-
 in-Chief of “Modeling and Simulation in Materials Science and Engineerin
 g” from 2006-2016\, has published over 300 journal papers that have rece
 ived over 20000 citations with an h-index of 78 (Google Scholar)\, and has
  been the Principal Investigator on well over $40M of funded research proj
 ects.
LOCATION:BM 5202 https://plan.epfl.ch/?room==BM%205202 https://epfl.zoom.u
 s/j/65093257313
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR