PARTICLE REARRANGEMENT AND DISLOCATION CREEP IN A SNOW-DENSIFICATION PROCESSReport as inadecuate




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Abstract : A characteristic bend found in a snow-density profile at polar ice sheets was investigated from a view point of pressure sintering of ice. The bend appeared at a density of about 700 kg-m3 and a pressure of 0.1 MPa. It is concluded that the bend appears when the dislocation creep mechanism becomes effective, and that both particle rearrangement and dislocation creep contribute to densification at densities from 550 to about 700 kg-m3. The yield stress of ice was estimated from the effective pressure at the contact between particles. Obtained values are by two orders of magnitude smaller than usual laboratory results because the strain rate is as low as 10-11 s-1.





Author: T. Ebinuma N. Maeno

Source: https://hal.archives-ouvertes.fr/



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