BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:General theory of the Kanzaki force field: static and dynamic mode
 ls of dislocations and other extended defects  - Dr Benat Gurrutxaga-Lerma
 \, CUED
DTSTART:20190215T143000Z
DTEND:20190215T150000Z
UID:TALK118462@talks.cam.ac.uk
CONTACT:Hilde Hambro
DESCRIPTION:The _Kanzaki forces_ are the standard way of representing poin
 t defects in the elastic continuum. They are the forces that would have to
  be applied on a perfect\, defect-free crystalline lattice to generate the
  topology of the point defect. By computing these forces in atomistic latt
 ices\, one obtains a true multiscale representation of the defect.\n\nIn t
 his talk\, I generalise the concept of Kanzaki forces to all other crystal
 line defects. I will discuss how the resulting _Kanzaki force fields_ are 
 to be computed for any general defect\, including dislocations\, grain and
  twin boundaries\, or cracks. \n\nI will then focus on crystallographic di
 slocations. I will show that the Kanzaki force field of a dislocation cons
 ists of two separate components: a _Volterra_ contribution associated with
  the disregistry that characterises the dislocation\, and a  _core_ contri
 bution associated with the specific topology of the dislocation core. \n\n
 I will then show how to use each of these components to model the dislocat
 ion core in the elastic continuum. Unlike other regularisation procedures 
 like the Peierls-Nabarro model\, the resulting models are topologically tr
 ue to the dislocation core\, and energetically accurate up to the harmonic
  approximation. \n\nFinally\, I will discuss how the Kanzaki force field c
 an be employed to study dislocation mobility using lattice dynamics\, and 
 I will highlight several lattice instabilities that arise when screw and e
 dge dislocations are driven at high speeds.
LOCATION:Oatley Seminar Room\, Department of Engineering
END:VEVENT
END:VCALENDAR