Mechanical Properties of First-Year Sea Ice at Intermediate Strain Rates.

摘要

Detailed knowledge of the mechanical behavior of saline ice at elevated confining pressure and at intermediate strain rates is essential input to the design of Arctic ports, ice-bound oil platforms, ice breakers, and other structures and equipment engineered to operate under Arctic conditions. A series of laboratory tests has been conducted to determine both the compressive and tensile strengths of saline ice at intermediate strain rates. Data are reported for samples oriented in directions perpendicular and parallel to a sheet of first-year sea ice. Most of the samples were tested at a temperature of /minus/10/degree/C. Results show a decrease in uniaxial and confined compressive strengths as strain rate was raised from 10/sup /minus/2//s to 0.5/s. Tensile strength, determined from Brazil tests, also decreased with increasing strain rate. The pressure/volume response of samples taken parallel and normal to the plane of an ice sheet is also reported. Samples taken normal to the plane of the ice sheet generally had higher compressive strength than samples taken in the plane of the ice sheet. 15 refs., 10 figs., 5 tabs. (ERA citation 13:049324)