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Volume 47 (1985)
- Issue 4 Pages 137-
- Issue 3 Pages 97-
- Issue 2 Pages 55-
- Issue 1 Pages 1-
Volume 47, Issue 1
Displaying 1-6 of 6 articles from this issue
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Takeo HONDOH1985 Volume 47 Issue 1 Pages 1-2
Published: March 30, 1985
Released on J-STAGE: July 23, 2009
JOURNAL FREE ACCESSThis symposium was organized by the Associate Committee on Physical Properties of Snow and Ice in the Japanese Society of Snow and Ice. An introductory remark given by Hondoh describes recent status of research on the plasticity of ice on the basis following three papers presented at the symposium. Nakamura's paper describes a short history of research work on the plasticity of ice before 1978 : i.e., after the discovery of basal glide of ice single crystal made by McConnel in 1890 till the recent experimental works on impurity effects. Fukuda's paper gives a brief review on the dislocation mechanism for explaining remarkable anisotropy of plastic deformation of ice. It was concluded that the characteristic anisotropy exhibited as an easy glide on the basal plane was attributed to the low stacking-fault energy on the basal plane in the ice crystal. Azuma's paper gives a brief description of recent experimental results on the effects of hydrostatic pressure on the plasticity of ice. Uniaxial compression tests under various hydrostatic pressure between 0.1 and 50 MPa showed that the dislocation velocity in ice single crystals decreased when hydrostatic pressure increased while the polycrystalline ice became softer when hydrostatic pressure increased.View full abstractDownload PDF (348K) -
Tsutomu NAKAMURA1985 Volume 47 Issue 1 Pages 3-13
Published: March 30, 1985
Released on J-STAGE: July 23, 2009
JOURNAL FREE ACCESS -
Akeharu FUKUDA1985 Volume 47 Issue 1 Pages 15-20
Published: March 30, 1985
Released on J-STAGE: May 07, 2010
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Nobuhiko AZUMA1985 Volume 47 Issue 1 Pages 21-26
Published: March 30, 1985
Released on J-STAGE: July 23, 2009
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Shigeru SHIMODA, Tatsuya ISHIBASHI, Takashi TAMURA, Yoshiaki KAMADA1985 Volume 47 Issue 1 Pages 27-36
Published: March 30, 1985
Released on J-STAGE: July 23, 2009
JOURNAL FREE ACCESSTo obtain definite information on traction characteristics of snow tires with various type of anti-skid chains, experimental and analytical research was carried out on slippery surfaces such as packed snow and ice-covered roads. Using a specific model pertaining to tread pattern slip on road surfaces, a theoretical equation expressing the relationship between tire adhesion and slip ratio was introduced. By a slide-table-type tire tester, traction measurements on rolling snow tires were carried out under various chain and road condition. These results show that the traction of snow tire is affected strongly by the chain and road surface conditions. Generally, on packed snow-covered or ice-covered roads, the traction coefficient decreased considerably in comparison with the values for snow-free road. Snow tires fitted with regular metal chains seem to be most useful under slippery road conditions. On the contrary, new type chains made of plastic or rubber cannot be expected to work effectively on all slippery road surfaces, in spite of their noiseless and harmless (to the pavement) merits. Thus, the type of anti-skid chain must be selected suitably for the road surface condition.View full abstractDownload PDF (4757K) -
Kazuyuki KATO1985 Volume 47 Issue 1 Pages 37-44
Published: March 30, 1985
Released on J-STAGE: July 23, 2009
JOURNAL FREE ACCESSTheoretical and experimental studies were performed to clarify some effects of the frictional coefficient on ice forces on Arctic marine structures having vertical faces. Ice forces generated during a crushing mode of ice sheet failure were formulated using the upper bound theorem of limit analysis to take the effect of the frictional coefficient into account. Model tests were carried out in order to examine the ice forces calculated from the theory. The theoretical ice forces were in good agreement with the experimental ice forces with a few exceptions. Model tests were also performed with various surface materials to obtain the effects of frictional coefficient on ice forces when ice sheets failed in a buckling mode. As a result of the model tests, one can consider the frictional coefficient as a parameter which links the numerical solutions with the extreme boundary conditions. There is a tendency for buckling load to increase when the frictional coefficient increases.
It can be concluded that the frictional resistance affects the ice force on a structure with either vertical or sloping faces. It is suggested that use of low friction materials or surface coating would reduce the ice force on an Arctic marine structure.View full abstractDownload PDF (3754K)
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