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DTSTAMP:20210916T132451Z
LOCATION:Michel Mayor
DTSTART;TZID=Europe/Stockholm:20210707T140000
DTEND;TZID=Europe/Stockholm:20210707T143000
UID:submissions.pasc-conference.org_PASC21_sess150_msa110@linklings.com
SUMMARY:Dislocation Drag in Metals and its Effect on Material Response
DESCRIPTION:Minisymposium\n\nDislocation Drag in Metals and its Effect on 
 Material Response\n\nBlaschke\n\nThe mobility of dislocations is an import
 ant factor in understanding material strength. Dislocations experience a d
 rag due to their interaction with the crystal structure, the dominating co
 ntribution at high stress and temperature being the scattering off phonons
  due to phonon wind. Yet, the functional dependence of this effect on velo
 city and other properties has eluded a good theoretical understanding. In 
 this talk we present recent results on dislocation drag from first princip
 les as a function of velocity (resp. stress), temperature, density, and ch
 aracter. We then discuss the impact this newly derived drag coefficient ha
 s on the overall material response by presenting selected examples from si
 ngle crystal plasticity simulations as well as an analytical model of stre
 ss as a function of strain rate which takes into account mobile-immobile d
 islocation intersections as well as dislocation drag from phonon wind.\n\n
 Domain: CS and Math, Chemistry and Materials, Physics, Engineering
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