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SUMMARY:Dislocation theory applied to steady and transient creep - Thomas 
 Breithaupt - Department of Earth Sciences\, University of Cambridge
DTSTART:20220427T150000Z
DTEND:20220427T160000Z
UID:TALK173153@talks.cam.ac.uk
CONTACT:Tom Winder
DESCRIPTION:In applications critical to the geological\, materials\, and e
 ngineering sciences\, deformation occurs at strain rates too small to be a
 ccessible experimentally. Instead\, extrapolations of empirical relationsh
 ips are used\, leading to epistemic uncertainties in predictions. To addre
 ss these problems\, we construct a new theory of the fundamental processes
  affecting dislocations: storage and recovery. We then validate our theory
  for olivine deformation. This model explains the empirical relationships 
 among strain rate\, applied stress\, and dislocation density in disparate 
 laboratory regimes. It predicts the previously unexplained dependence of d
 islocation density on applied stress in olivine. The predictions of our mo
 del for Earth conditions differ from extrapolated empirical relationships.
  For example\, it predicts rapid\, transient deformation in the upper mant
 le\, consistent with recent measurements of post-glacial rebound.
LOCATION:In person (Wolfson) and ONLINE - Details to be sent by email
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