Accession Number:

ADA291877

Title:

In-Situ Synchrotron X-Ray Topographic Studies Of Polycrystalline Ice.

Descriptive Note:

Corporate Author:

THAYER SCHOOL OF ENGINEERING HANOVER NH

Personal Author(s):

Report Date:

1994-01-01

Pagination or Media Count:

11.0

Abstract:

This paper provides an overview of recent in-situ synchrotron x-ray topography experiments on the deformation of polycrystalline ice. It has been shown that deformation is initiated by the nucleation of semi-hexagonal basal dislocation loops at grain boundary facets. The dislocations subsequently glide across the grain. The slip system which operates was found to be the one with the highest resolved shear stress. Non-basal slip was also observed but only becomes significant if basal slip is inhibited. Whilst slip propagation between grains has been observed once it appears to occur only for special orientation relationships between grains. MM

Subject Categories:

  • Snow, Ice and Permafrost
  • Nuclear Physics and Elementary Particle Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE