Signatur:
ZSP-201-84/33
In:
CRREL Report, 84-33
Beschreibung / Inhaltsverzeichnis:
A small-scale experimental study was conducted to characterize the magnitude and nature of ice forces during continuous crushing of ice against a rigid, vertical, cylindrical structure. The diameter of the structure was varied from 50 to 500 mm, the relative velocity from 10 to 210 mm/s, and the ice thickness from 50 to 80 mm. The ice tended to fail repetitively, with the frequency of failure termed the characteristic frequency. The characteristic frequency varied linearly with velocity and to a small extent with structure diameter. The size of the damage zone was 10 to 50% of the ice thickness, with an average value of 30%. The maximum and mean normalized ice forces were strongly dependent on the aspect ratio (structure diameter/ice thickness). The forces increased significantly with decreasing aspect ratio, but were constant for large aspect ratios. The maximum normalized forces appeared to be independent of strain rate. The effect of velocity on the normalized ice forces depended on structure diameter. The mean effective pressure or specific energy of ice crushing depended on both aspect ratio and ice-structure relative velocity. The energy required to crush the ice for the one failure cycle was obtained from the ice force records for each test, and was compared to the energy calculated from an idealized sawtooth shape for the force record, the maximum force, velocity and characteristic frequency data. Originator - supplied keywords included: Cold regions, Cold regions construction, Cylindrical test structures, Ice, Ice crushing, Ice forces, and Test facilities.
Materialart:
Schriftenreihen ausleihbar
Seiten:
vi, 47 Seiten
,
Illustrationen
Serie:
CRREL Report 84-33
URL:
https://hdl.handle.net/11681/9351
Sprache:
Englisch
Anmerkung:
Contents
Abstract
Preface
Nomenclature
Introduction
Test objectives
Experimental setup and procedures
Facilities
Test fixture
Data acquisiton system
Ice sheets
Measurement of ice properties
Daily test summary
Experimental results and discussion
Observations
Ice force records
Frequency of ice force variations
Discussion
Maximum crushing forces
Mean effective pressure or specific energy of ice in crushing
Failure energy of ice
Ratio of maximum force to mean force
Summary and conclusions
Literature cited
Appendix A: Data for continuous crushing tests
Standort:
AWI Archiv
Zweigbibliothek:
AWI Bibliothek
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