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RESEARCH PAPERS: Arctic Engineering

The Strength and Ductility of Ice Under Tension

[+] Author and Article Information
R. W. Lee, E. M. Schulson

Thayer School of Engineering, Dartmouth College, Hanover, N.H. 03755

J. Offshore Mech. Arct. Eng 110(2), 187-191 (May 01, 1988) (5 pages) doi:10.1115/1.3257049 History: Received July 01, 1985; Revised August 06, 1987; Online October 30, 2009

Abstract

Tensile experiments have been performed on aggregates of equiaxed and randomly oriented ice Ih of varying grain size (1.4 to 7.9 mm) at −10°C at two strain rates, 10−3 s−1 and 10−7 s−1 . At both rates, which were held constant using “feed-back” control, the tensile strength decreased with increasing grain size. This result confirms earlier work on grain size effects in which the rate randomly varied (from 0.6 × 10−6 s−1 to 3 × 10−6 s−1 ) from test to test. At the higher rate the ice is brittle over the complete range of grain size and its strength is given by the relationship σf = σo + kd−1/2 where σo = 0.51 MPa and k = 0.03 MPa m1/2 . At the lower rate the ice is ductile over the same range of grain size and its strength is given by the relationship σf = Kd−1/2 where K = 0.050 MPa m1/2 . These effects are explained quantitatively in terms of the nucleation and propagation of cracks.

Copyright © 1988 by ASME
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