FRACTURE OF LAKE AND SEA ICE.

The increased activity in cold regions has made a thorough understanding of fracture in lake and sea ice quite desirable, inasmuch as this information has application to a number of problems of geophysical as well as engineering importance. This survey starts with a discussion of the structure of ic...

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Bibliographic Details
Main Authors: Weeks,W. F., Assur,A.
Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
Format: Text
Language:English
Published: 1969
Subjects:
Snow
Ice and Permafrost
(*SEA ICE
FRACTURE(MECHANICS))
(*LAKES
ICE)
MICROSTRUCTURE
ICEBREAKERS
FLOATING BODIES
NAVIGATION
PHASE STUDIES
FLEXURAL STRENGTH
COMPRESSIVE PROPERTIES
ENGINEERING
GEOPHYSICS
X RAY DIFFRACTION
STRUCTURAL PROPERTIES
TENSILE PROPERTIES
DETERIORATION
ARCTIC REGIONS
LAKE TUTO
PETERS LAKE
POINT BARROW
THULE(GREENLAND)
Arctic
Greenland
Ice
permafrost
Point Barrow
Sea ice
Thule
Online Access:http://www.dtic.mil/docs/citations/AD0697750
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0697750
Description
Summary:The increased activity in cold regions has made a thorough understanding of fracture in lake and sea ice quite desirable, inasmuch as this information has application to a number of problems of geophysical as well as engineering importance. This survey starts with a discussion of the structure of ice I and the macro- and microstructure of sea and lake ice as well as their chemistry and phase relations. Recent work on the direct observation of dislocations as well as the formation of cracks in ice is summarized. Formal ice-brine-air models for analyzing variations in ice strength are also reviewed. The results of the different types of tests are discussed and compared (compressive, indentation, direct and ring-tension, small beam flexure and in situ cantilevers and simple beams, shear, and impact). Scale effects are considered as well as the rapid strength deterioration experienced by ice sheets in the spring. Finally, a number of recommendations are made concerning future research in this field. (Author) Sponsored by Office of Naval Research, Washington, D. C.

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