Ice Forces on Flat, Vertical Indentors Pushed through Floating Ice Sheets

Structures placed in an ice environment should be able to withstand the ice forces that are produced by the motion of a floating ice sheet. To observe the crushing failure of ice and to characterize the magnitude and nature of ice forces, an experimental study was conducted by pushing vertical, flat...

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Bibliographic Details
Main Authors: Nakazawa, Naoki, Sodhi, Devinder S.
Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
Format: Text
Language:English
Published: 1990
Subjects:
Snow
Ice and Permafrost
*CRACKING(FRACTURING)
*LOAD DISTRIBUTION
*ICE
LABORATORY TESTS
LOADS(FORCES)
CRACKS
STRAIN(MECHANICS)
FRESH WATER
BRITTLENESS
MODEL TESTS
SHEETS
PRESSURE
ACOUSTIC SIGNALS
DUCTILITY
COASTAL ENGINEERING
FAILURE(MECHANICS)
OFFSHORE STRUCTURES
ACOUSTIC EMISSIONS
FLOATING BODIES
CRUSHING
MECHANICAL PROPERTIES
MICROCRACKING
VELOCITY
PEAK VALUES
*ICE MECHANICS
EFFECTIVE PRESSURE
ICE SHEETS
INDENTATION
Ice
Ice Sheet
permafrost
Online Access:http://www.dtic.mil/docs/citations/ADA223420
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA223420
Description
Summary:Structures placed in an ice environment should be able to withstand the ice forces that are produced by the motion of a floating ice sheet. To observe the crushing failure of ice and to characterize the magnitude and nature of ice forces, an experimental study was conducted by pushing vertical, flat indentors through floating ice sheets made up of freshwater, columnar ice. Depending on the velocity of the indentor, ductile or brittle behavior of ice was observed. Microcracks and macrocracks were observed during the tests. The energy used to produce the maximum ice force was found to be approximately the same for different indentor velocities. The positions of the resultant forces were found to be in the center of the contact area. The area of the ice damaged by the first peak loading of the identor was about the same, even when the indentor velocities were different. Acoustic emission signals were measured during indentation experiments, and these were found to correlate with the ice force that produces strain and microcracking in the ice. Keywords: Ice mechanics; Cracking/fracturing; Coastal engineering; Offshore structures; Load distribution; Crushing; Effective pressure; Freshwater ice; Ice forces; Laboratory tests; Macrocracking; Microcracking.

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