Physical and mechanical properties of Hobson's Choise Ice Island cores

Poplin, J.P.; Ralston, T. D.

doi:10.1016/0165-232x(92)90018-p

Cited by 6 publications

(2 citation statements)

References 8 publications

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“…This would tend to leave air bubbles inside grains rather than at the grain boundaries, where they would have initially been in the early stages of ice formation from snow. The uniaxial compressive-strength data from ice samples taken from a core through the entire thickness of Hobson’s Choice Ice Island Poplin and Ralston, 1992) supports this conclusion. Ice from the bottom region of the core tested at the same temperature and strain rate as ice from the top legion was stronger.…”

Section: Resultsmentioning

confidence: 74%

Characterization and flexural strength of iceberg and glacier ice

Gagnon

Gammon

1995

J. Glaciol.

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ABSTRACT. Flex ura l strength of iceber g a nd glacier ice was d etermin ed from four-poin t beam-bending experim ents. A la rge qua ntity of glacial ice was collec ted fr om four icebergs and o ne glacier, and a d eta iled ice-charac teri zation progr a m was performed o n sa mples from th e fiv e sou rces. Beam-be ndin g ex perim e nts were co ndu cted at fo ur temperatures in the ra nge 1° to -16°C a nd at strain rates of 10 3 and 10 5 S I. Th e Oex ura l strength was found to increase with in creasing strain rate (based on ex treme fibre stra in ) a nd dec reasin g tempera ture. The d a ta sugges t tha t airbubble inclusions play a n importa nt role in determining the Oex ural streng th o f g lacial ice a nd this can explain the signifi cant differences in mea n streng th of the ice from th e fi ve so urces. At a stra in rate of 10 3 S 1 and temperature of 11°C, th e Oex ura l strength was found to in crease as th e number of bubbl es per unit vo lum e increased. Redu ction or crac k-initi a ting stresses a t grain bound a ri es by

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Section: Resultsmentioning

confidence: 74%

Characterization and flexural strength of iceberg and glacier ice

Gagnon

Gammon

1995

J. Glaciol.

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“…Gammon and others (1983) looked at porosity, internal cracks and grain structure in five grounded icebergs, and reported cracks that apparently occurred after calving. A number of other studies have provided a physical description of iceberg ice (Arockiasamy and others, 1983; Jeffries and others, 1990, 1991; Poplin and Ralston, 1992; Masterson and others, 1993; Gagnon and Gammon, 1995; Barrette and Sinha, 1996), but they have not addressed the nature of these planar features. The purpose of this paper is to provide additional information on this subject.…”

Section: Introductionmentioning

confidence: 99%

Healed cracks in iceberg ice

Barrette¹,

Jordaan²

2002

J. Glaciol.

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A noticeable trait of iceberg ice is the presence of several sets of planar features cross-cutting each other at various angles. Close-up views of these features show that they consist of an array of individual air inclusions that differ in size, shape and spatial distribution. In none of the cases resolvable at the scale of our observations were these inclusions physically linked to form a continuous fracture plane, although they may have originated as such. All postdate the formation of ice veins.

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The Ellesmere Ice Shelves, Nunavut, Canada

Jeffries

2017

Springer Polar Sciences

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Physical and mechanical properties of Hobson's Choise Ice Island cores

Cited by 6 publications

References 8 publications

Characterization and flexural strength of iceberg and glacier ice

Characterization and flexural strength of iceberg and glacier ice

Healed cracks in iceberg ice

The Ellesmere Ice Shelves, Nunavut, Canada

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