Call number:
ZSP-202-269
In:
Research report
Description / Table of Contents:
CONTENTS: Preface. - List of symbols. - Introduction. - Structure of ice and ice sheets. - Ice as a mineral. - Lake and sea ice. - Chemistry and phase relations. - Dislocations,cracks,and stress concentrators. - Direct observation of dislocations. - Crackformation. - Stress concentration. - Theoretical considerations. - Experimental results. - Compressive strength. - Indentation failure. - Tensile strength. - Flexural strength. - Shear strength. - Impact strength. - Scale effects. - Strength deterioration in the spring. - Recommended research. - Summary. - Selected bibliography. - Abstract.
Description / Table of Contents:
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 cornpared (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.
Type of Medium:
Series available for loan
Pages:
viii, 79 Seiten
,
Illustrationen
Series Statement:
Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 269
URL:
http://www.worldcat.org/oclc/647427544
Language:
English
Branch Library:
AWI Library
