CREEP OF ICE AT LOW STRESSES

UNIAXIAL COMPRESSION TESTS WERE MADE ON 2 X 2 X 6 CENTIMETER SAMPLES OF LARGE-GRAINED COMMERCIAL ICE AND SMALL -GRAINED GLACIER ICE AT TEMPERATURES FROM MINUS 1.3 TO MINUS 18.9C AND STRESSES DOWN TO ABOUT ONE HUNDRED THOUSAND DYNES/ SQUARE CENTIMETER, USING A SPECIAL APPARATUS TO PERMIT SIMULTANEOUS MEASUREMENT OF THREE SAMPLES AT DIFFERENT STRESSES. THE UNIAXIAL STRESSES AND STRAIN RATES WERE REDUCED TO SHEAR STRESSES AND STRAIN RATES BY DIVIDING AND MULTIPLYING, RESPECTIVELY, THE FORMER BY THE SQUARE ROUTE OF THREE. THE LOG SHEAR STRAIN RATE VERSUS LOG SHEAR STRESS CURVES WAS ESSENTIALLY LINEAR FOR THE LOW-STRESS CREEP MEASUREMENTS. ASSUMING A LINEAR FLOW LAW FOR LOW-STRESS CREEP, ACTIVATION ENERGIES FOR CREEP OF ABOUT 14,300 CAL/MOLE WERE DETERMINED. THE SMALLER-GRAINED ICE HAD A HIGHER VISCOSITY COEFFICIENT THAN THE LARGER-GRAINED ICE. THE OBSERVED ACTIVATION ENERGY FOR CREEP OF ICE IS PROBABLY THAT FOR SELF-DIFFUSION. ALTHOUGH LACKING A CONCRETE DEFORMATION MECHANISM, THE RATE PROCESS THEORY, WHICH LEADS TO A HYPERBOLIC SINE STRESS DEPENDENCE, SEEMS TO BEST DESCRIBE THE EXPERIMENTAL RESULTS. /AUTHOR/

  • Supplemental Notes:
    • Research RePORT NO 72, II & 6 PP, 4 FIG, 1 TAB, 16 REF
  • Corporate Authors:

    U.S. Army Corps of Engineers

    ,    
  • Authors:
    • Butkovich, T R
    • Landauer, J K
  • Publication Date: 1960-8

Subject/Index Terms

Filing Info

  • Accession Number: 00237422
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 16 1994 12:00AM