Discrete dislocation dynamics simulation and continuum modeling of plastic boundary layers in tricrystal micropillars

Katerina E Aifantis, J. Senger, D. Weygand, M. Zaiser

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

16 Citations (Scopus)

Abstract

Since the mid 80s various gradient plasticity models have been developed for obtaining the plastic response of materials at the micron- and submicron- scales. In particular, gradient terms have been proven to be crucial for understanding size effects in constrained plastic flow, which are related to the emergence of plasticity boundary layers near passive (plastically not deformable) boundaries. In spite of the success of gradient theories in modeling boundary layer formation, there remain unresolved issues concerning the physical interpretation of the internal length scale involved in the theoretical formulation. Physically, boundary layer formation is related to the piling up of dislocations against the boundaries. This phenomenon is investigated by performing discrete dislocation dynamics (DDD) simulations on a tri-crystal with plastically non-deforming grain boundaries. Strain distributions are derived from the DDD simulations and matched with the results of gradient plasticity calculations, in order to identify the internal length scale governing the boundary layer width.

Original languageEnglish (US)
Title of host publicationIOP Conference Series: Materials Science and Engineering
Volume3
DOIs
StatePublished - 2009
Externally publishedYes
Event3rd International Conference on the Fundamentals of Plastic Deformation, DISLOCATIONS 2008 - Hong Kong, Hong Kong
Duration: Oct 13 2008Oct 17 2008

Other

Other3rd International Conference on the Fundamentals of Plastic Deformation, DISLOCATIONS 2008
CountryHong Kong
CityHong Kong
Period10/13/0810/17/08

Fingerprint

Boundary layers
Plastics
Plasticity
Computer simulation
Plastic flow
Dislocations (crystals)
Piles
Grain boundaries
Crystals

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Aifantis, K. E., Senger, J., Weygand, D., & Zaiser, M. (2009). Discrete dislocation dynamics simulation and continuum modeling of plastic boundary layers in tricrystal micropillars. In IOP Conference Series: Materials Science and Engineering (Vol. 3). [012025] https://doi.org/10.1088/1757-899X/3/1/012025

Discrete dislocation dynamics simulation and continuum modeling of plastic boundary layers in tricrystal micropillars. / Aifantis, Katerina E; Senger, J.; Weygand, D.; Zaiser, M.

IOP Conference Series: Materials Science and Engineering. Vol. 3 2009. 012025.

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

Aifantis, KE, Senger, J, Weygand, D & Zaiser, M 2009, Discrete dislocation dynamics simulation and continuum modeling of plastic boundary layers in tricrystal micropillars. in IOP Conference Series: Materials Science and Engineering. vol. 3, 012025, 3rd International Conference on the Fundamentals of Plastic Deformation, DISLOCATIONS 2008, Hong Kong, Hong Kong, 10/13/08. https://doi.org/10.1088/1757-899X/3/1/012025
Aifantis KE, Senger J, Weygand D, Zaiser M. Discrete dislocation dynamics simulation and continuum modeling of plastic boundary layers in tricrystal micropillars. In IOP Conference Series: Materials Science and Engineering. Vol. 3. 2009. 012025 https://doi.org/10.1088/1757-899X/3/1/012025
Aifantis, Katerina E ; Senger, J. ; Weygand, D. ; Zaiser, M. / Discrete dislocation dynamics simulation and continuum modeling of plastic boundary layers in tricrystal micropillars. IOP Conference Series: Materials Science and Engineering. Vol. 3 2009.
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