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SUMMARY:Ongoing efforts to develop traction-separation laws for continuum 
 models based on atomistic simulations
DTSTART:20190328T160000
DTEND:20190328T170000
DTSTAMP:20260407T002542Z
UID:f7809d3181d19d3ac9a8a33ed2044e1782d7618d94f146a0c5fc7090
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Rebecca Janisch is Research Group Leader in the field of M
 echanical Properties of Interfaces\, at the Department of Micromechanical 
 and Macroscopic Modeling at ICAMS\, Ruhr-Universität Bochum\, Germany. H
 er work mostly focuses on understanding mechanical properties of interface
 s using both Ab-initio electronic structure calculations\, and classical m
 olecular dynamics simulations. Dr. Janisch obtained her PhD at the departm
 ent “Gefüge und Grenzflächen”\, Max PlanckInstitut für Metallforsch
 ung Stuttgart. She held  postdoctoral research positions at the Technisch
 e Universität Chemnitz in Germany\, and at the University of California S
 anta Barbara\, USA. Prior to joining  Ruhr-Universität Bochum\, Dr. Jani
 sch was Member of academic staff at the Universität Erlangen-Nürnberg in
  Germany.  \nAbstract: Continuum mechanics provides an efficient way to m
 odel fracture at the engineering scale\, based on stresses\, stress intens
 ity factors\, and energy release rates. Additionally\, material-specific i
 nformation and failure criteria are required to describe fracture at this 
 scale. At the atomic scale\, in contrast\, the breaking of atomic bonds is
  caused by critical forces acting on individual atoms. Approaches to bridg
 e the two scales so far suffer from the impossibility to directly convert 
 the atomic forces at which bonds are breaking into meaningful continuum me
 chanical failure stresses.\nChallenges on the way are the environment-depe
 ndency of the critical forces\, which are needed to separate pairs of atom
 s\, as well as the quantitative difference between critical stresses on th
 e atomistic respectively mesoscopic length scale by several orders of magn
 itude. In this presentation existing approaches to overcome these problems
  will be reviewed. Our ongoing efforts to develop a fracture mechanical mo
 del will be presented\, which scales the atomic forces occurring during bo
 nd breaking into meaningful continuum mechanical quantities in form of sca
 le-sensitive traction separation laws. The model is established for fractu
 re in brittle\, single crystalline tungsten. Possible extensions to system
 s including defects such as grain boundaries\, will be discussed.\n 
LOCATION:ME B1 B10 https://plan.epfl.ch/?room=MEB1B10
STATUS:CONFIRMED
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