Accession Number : ADA317344

Title :   Modelling & Observation of Crack Nucleation in Ice Due to Elastic & Plastic Anisotropy.

Descriptive Note : Final rept. 1 Jun 92-31 Mar 96,

Corporate Author : DARTMOUTH COLL HANOVER NH

Personal Author(s) : Frost, Harold J.

PDF Url : ADA317344

Report Date : JUL 1996

Pagination or Media Count : 11

Abstract : The primary result of this project are a clear understanding of the processes which initial cracks in columnar ice under typical conditions. The primary material of study was laboratory-grown freshwater ice, in which the crystals grew as long columns with diameters in the range of a few millimeters. For some fracture toughness measurements we used large single crystals of freshwater ice. Some related work has also been done on laboratory-grown columnar saline ice.

Descriptors :   *ICE MECHANICS, *CRACK PROPAGATION, SINGLE CRYSTALS, TOUGHNESS, NUCLEATION, ICE FORMATION, FRACTURE(MECHANICS), FRESH WATER, BRITTLENESS, ANISOTROPY, CRYSTAL GROWTH, POLYCRYSTALLINE, STRESS CONCENTRATION.

Subject Categories : Snow, Ice and Permafrost

Distribution Statement : APPROVED FOR PUBLIC RELEASE