Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2011-09-01

Journal: SCIENCE CHINA-TECHNOLOGICAL SCIENCES

Included Journals: EI、SCIE、Scopus

Volume: 54

Issue: 9

Page Number: 2429-2436

ISSN: 1674-7321

Key Words: sea ice; ice problems; ice control; compressive strength; measurements; parameter estimation

Abstract: For the abnormal ice condition in 2009-2010 winter, sea ice samples were collected in a tide ditch outside a port in the east coast of Liaodong Bay, and ice specimens were prepared. Experimental study was carried out with a temperature-control precision of 0.1A degrees C, and 117 columnar-grained ice specimens were loaded along the direction parallel to ice surface under different test temperatures (-4, -7, -10, -13, -16A degrees C) and strain rates ranging from 10(-6) to 10(-2) s(-1) within which the ductile region, ductile-brittle transition and brittle region are contained. The uniaxial compressive strengths, density and salinity of the ice specimens were measured. The results support the curved-surface relationship between the uniaxial compressive strength and porosity within a wide range of strain rate. The curved-surface relationship gives a quantitative description about the variations of the mechanical behavior transition point with ice porosity, and supplies a uniform mathematical representation of uniaxial compressive strength under different failure modes. Besides, it is deduced that abnormal ice condition in 2009-2010 winter will not result in a change of the uniaxial compressive strength of sea ice in Bohai Sea.