Novel shearing apparatuses in confined flow for investigating recrystallization and fabric evolution processes in mono- and polycrystalline ice. (Downloadable article, 2010s) [WorldCat.org]
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Novel shearing apparatuses in confined flow for investigating recrystallization and fabric evolution processes in mono- and polycrystalline ice.

Author: D Samyn; N Azuma; I Matsuda; Y Osabe
Publisher: [Cambridge] : Published for the International Glaciological Society by Cambridge University Press
Edition/Format:   Downloadable article : Document   Computer File : English
Publication:Journal of Glaciology
Summary:
Abstract: The orientations of individual crystals within a polycrystalline aggregate subjected to stress have a strong influence on its bulk strain rate and flow behavior. The ability to include the effect of crystal fabric and recrystallization processes in an ice flow law, especially at the bottom of glaciers and ice sheets where temperature is close to the pressure-melting point, is important because the  Read more...
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Details

Material Type: Document, Internet resource
Document Type: Internet Resource, Article, Computer File
All Authors / Contributors: D Samyn; N Azuma; I Matsuda; Y Osabe
ISSN:0022-1430
OCLC Number: 1051386613
Notes: In: Journal of Glaciology, Vol. 60, no. 219 (2014), p.171-182.
Description: 1 online resource

Abstract:

Abstract: The orientations of individual crystals within a polycrystalline aggregate subjected to stress have a strong influence on its bulk strain rate and flow behavior. The ability to include the effect of crystal fabric and recrystallization processes in an ice flow law, especially at the bottom of glaciers and ice sheets where temperature is close to the pressure-melting point, is important because the stratigraphy of the ice body may be affected and the paleoclimate reconstruction hampered. We present herein three newly developed deformation apparatuses offering the possibility, from single experiments, of investigating different finite strain stages and their corresponding c -axis fabric and grain texture patterns in various confined, shear flow configurations (simple shear, pure shear and compression/extension bending). The technical set-ups and major advantages compared to classical methods are explained, and results from experiments are discussed in order to illustrate the functioning and purposes of the methods. In all experiments, significant variations in the microstructural development have been observed that reflect the varying orientations of the anisotropy and its relationship to the stress pattern. In monocrystalline ice-bending experiments, the pre-existing c -axis fabric is shown to have a profound influence on the response to stress and possibly to the type of slip system activated.

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