NONSIMULTANEOUS CRUSHING DURING EDGE INDENTATION OF FRESH-WATER ICE SHEETS

Authors
Citation
Ds. Sodhi, NONSIMULTANEOUS CRUSHING DURING EDGE INDENTATION OF FRESH-WATER ICE SHEETS, Cold regions science and technology, 27(3), 1998, pp. 179-195
Citations number
37
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geosciences, Interdisciplinary",Engineering,"Environmental Sciences
ISSN journal
0165-232X
Volume
27
Issue
3
Year of publication
1998
Pages
179 - 195
Database
ISI
SICI code
0165-232X(1998)27:3<179:NCDEIO>2.0.ZU;2-E
Abstract
Indentation tests were conducted by pushing segmented indenters into t he edge of freshwater ice sheets at different velocities. Ice crushing forces were measured independently in each segment. Results of these tests indicate that there is simultaneous generation of forces on all segments during low-velocity indentation, whereas there is a nonsimult aneous force acting on the segments during high-velocity indentation. For brittle crushing of ice at a high indentation rate, the effective pressures measured during these tests are in the range of pressures me asured in the field during the impact of ice flees against large struc tures. Under the assumption that the size of crushing zones becomes sm all with increasing indentation speed, a statistical model is used to determine the correlation between the forces measured in different seg ments in terms of a correlation length parameter. A comparison of the trends in the plots of experimental data with theoretical results show s that the correlation length parameter decreases as the reciprocal of the indentation velocity. Under the assumption of the similarity prin ciple, according to replica modeling, an estimate of the correlation l ength parameter is empirically obtained in terms of ice thickness and indentation velocity. (C) 1998 Elsevier Science B.V. All rights reserv ed.