Dislocation motion around loaded notches in ice single-crystals

Citation
D. Cullen et al., Dislocation motion around loaded notches in ice single-crystals, COLD REG SC, 31(2), 2000, pp. 103-117
Citations number
32
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Civil Engineering
Journal title
COLD REGIONS SCIENCE AND TECHNOLOGY
ISSN journal
0165-232X → ACNP
Volume
31
Issue
2
Year of publication
2000
Pages
103 - 117
Database
ISI
SICI code
0165-232X(200007)31:2<103:DMALNI>2.0.ZU;2-L
Abstract
Synchrotron X-ray topography has been used to study dislocation behavior ar ound notches in single-crystals of ice during in-situ deformation at a cons tant strain-rate. During deformation at - 8 degrees C a dislocation-deplete d zone (DDZ) formed above the notch while a vertical array of dislocations formed below the notch. Modeling the interaction between basal plane disloc ation loops and the notch stress field suggested that this DDZ arose from d islocations gliding completely through the specimen. Dislocation activity a round the notch at -8 degrees C was much greater than that observed at -40 degrees C and -60 degrees C. (C) 2000 Elsevier Science B.V. All rights rese rved.