Accession Number : AD0697750

Title :   FRACTURE OF LAKE AND SEA ICE.

Descriptive Note : Research rept.,

Corporate Author : COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H

Personal Author(s) : Weeks,W. F. ; Assur,A.

Report Date : SEP 1969

Pagination or Media Count : 88

Abstract : 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)

Descriptors :   (*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

Subject Categories : Snow, Ice and Permafrost

Distribution Statement : APPROVED FOR PUBLIC RELEASE