Higher order alignment tensors for continuum dislocation dynamics

Thomas Hochrainer*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Dislocation density based modeling of crystal plasticity remains one of the central challenges in multi scale materials modeling. A dislocation based theory requires sufficiently rich dislocation density measures which are capable of predicting their own evolution. Continuum dislocation dynamics is based on a higher dimensional dislocation density tensor comprised of two distribution functions on the space of local orientations, which are the density of dislocations per orientation and the density of dislocation curvature per orientation. We propose to expand these functions into series of symmetric tensors (alignment tensors), to be used in dislocation based theories without extra dimensions. The first two terms in the expansion of the density define the total dislocation density and the Kröner-Nye tensor. The first term in the expansion of the curvature density, the scalar total curvature density, turns out to be a conserved quantity; the integral of which corresponds to the total number of dislocations. The content of the next higher order tensors is discussed.

Original languageEnglish
Title of host publicationProceedings of the Multiscale Materials Modeling 2012 Conference
PublisherMaterials Research Society
Pages1-7
Number of pages7
Volume1535
ISBN (Print)9781632661258
DOIs
Publication statusPublished - 2013
Event21st International Materials Research Congress, IMRC 2012 - Cancun, Mexico
Duration: 12 Aug 201217 Aug 2012

Conference

Conference21st International Materials Research Congress, IMRC 2012
Abbreviated titleIMRC 2012
CountryMexico
CityCancun
Period12/08/1217/08/12

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

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