Studies of the Mechanical Properties of Sea Ice XI The Flexural Strength of Sea Ice in situ* · **
The flexural strength of sea ice in situ was measured by a cantilever method. The measurement was carried out every February from 1963. The thickness of ice was 23~30 cm. The width of the beam was 30~40 cm. The length was 1.5~2 m. The surface temperature of the beam was-2.0 ~.-3.rc, the mean tempera...
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| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.614.3640 http://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/20323/1/1_p539-550.pdf |
| Summary: | The flexural strength of sea ice in situ was measured by a cantilever method. The measurement was carried out every February from 1963. The thickness of ice was 23~30 cm. The width of the beam was 30~40 cm. The length was 1.5~2 m. The surface temperature of the beam was-2.0 ~.-3.rc, the mean temperature was-O.8~-2.5°C and the chrolinity was 2.6~7.5%o. Both upward and downward bending forces were applied manually by a wooden lever with various speeds. The force was measured by an electric load-cell and was recorded with an oscil-lograph. The acceleration of the bending at the free end of the beam was also measured with an accelometer and also recorded. The deflection of the beam was obtained by integrating the acceleration. The increasing rate of the tensile stress at the surface of the supporting end of the beam was O.1~30 kg/cm2·sec. The flexural strength and Young's modulus were O.8~5 kg/cm2 and 1~12x1()3kg/cm2 respectively. The results are summarized as follows. In the case of the increasing rate of stress 6 less than 1 kg/cm2, the beam was deflected plastically, and in the case of iJ larger than 1 kg/cm2, the beam was deflected elastically and broke in the same manner as brittle material. In t~e latter case, the flexural strength increased remarkably with the increasing rate of stress. It can be said the flexural strength of sea ice is dependent upon the increasing rate of stress, ice temperature, the chlorinity (or salinity) and the structure. I. |
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