The use of plasticity theory in predicting the deformational behavior of ice and sand-ice systems
Smith, Leonard L.
Cheatham, John B.
Master of Science
Results of triaxial and indentation tests on ice and sand-ice samples are reported. The main parameters studied in the triaxial tests were temperature (-12 to 35°F), confining pressure (atmospheric to 4, psi), and loading rate (2.5 - 25 psi/sec). All of the indentation tests were conducted at atmospheric pressure and at a temperature of about -12°F. Most of the wedge indentation tests were conducted at a constant displacement rate of .12 in/min, which is approximately the same as the initial displacement rate in the triaxial test at 25 psi/sec. Flat punch tests were also performed at both .12 and 1. in/min. Results of theoretical calculations for wedge indentation of ice and sand-ice samples based on results of triaxial tests are compared with experimental results. All experimental results for wedge indentation of ice were bounded by the calculated results for perfectly rough and perfectly smooth wedges; however, the experimental results for the wedge indentation force on sand-ice samples were somewhat higher than the calculated results for a perfectly rough wedge. The experimentally measured force for a flat punch indenting both ice and sand-ice were greater than the calculated yield force. From the comparison of results between experimental and calculated force-displacement-relationship, it appears that plasticity theory is applicable for approximating the force-deformation relationships for both ice and sand-ice samples.