Mesoscale modelling of dislocation pile-up based on discrete interactions

R.H.J. Peerlings, Y. Kasyanyuk, A. Roy, M.G.D. Geers

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureConferentiebijdrageAcademicpeer review

Samenvatting

Conventional crystal plasticity formulations fail to correctly predict dislocation pile-ups against e.g. hard particles because they cannot capture the effect of short-range dislocation interactions. We illustrate this limitation by studying an idealised pile-up of infinite edge dislocation walls. In the limit where all discreteness is averaged out, as is done in crystal plasticity, the pile-up collapses into a continuous tilt wall and its finite width is lost. As a consequence, size effects such as the Hall-Petch effect can no longer be captured. Based on an analysis of the short-range interactions in the same idealised pile-up, we derive a back-stress which can be used to repair the conventional theory so that it predicts pile-ups of a finite width.

Originele taal-2Engels
TitelProceedings of the 4th International Conference on Multiscale Materials Modeling (MMM2008)
RedacteurenAnter El-Azab
Plaats van productieUnited States, Thallahassee, Florida
UitgeverijFlorida State University
Pagina's195-198
Aantal pagina's4
ISBN van elektronische versie9780615247816
StatusGepubliceerd - 2008
Evenement4th International Conference on Multiscale Materials Modeling, MMM 2008 - Tallahassee, Verenigde Staten van Amerika
Duur: 27 okt 200831 okt 2008

Congres

Congres4th International Conference on Multiscale Materials Modeling, MMM 2008
LandVerenigde Staten van Amerika
StadTallahassee
Periode27/10/0831/10/08

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