大型試験片を用いた柱状結晶氷の破壊じん性の検討

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The effects of loading rate and specimen size on the fracture toughness K_<Ic> of columnar grained ice have been investigated at -10℃. Notches bend specimens with the section size of 50×50 mm (medium size specimen) and 200×50 mm (large size specimens) were used. The notch of specimen was made using a thin razor blade embedded in the mold. Several tests were carried out at each test condition,and probabilistic nature of fracture toghness was also investigated. The results obtained are as follows. (1) The value of K_<Ic> decreased as K_I increased, and there was a transition in the range of K_I≒10-100 kPam^<1/2>/s. The value of K_<Ic> was not substantially affected by K_I in the high K_I region beyond the transition. (2) Scatter of K_<Ic> for the large size specimens was considerably small compared with that for the medium size specimens. (3) The minimum value of K_<Ic> was not affected by the specimen size in the low K_I range. However, in the high K_I range, the minimum value of K_<Ic> of a large specimen showed a little higher value than that of a medium specimen. (4) The size effect was analyzed from the view point of the "weakest link theory". It was observed that the experimental data did not agree with the theoretical prediction in the range of low values of K_<Ic>. (5) The relation between K_I and K_<Ic> was compared with other experimental data on a similar kind of ice. Considerable difference in K_<Ic>, especially in the low loading rate range, was observed. The reason is not yet clear, and more studies are needed.
社団法人日本材料学会の論文
1986-08-15

大型試験片を用いた柱状結晶氷の破壊じん性の検討

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