柱状結晶氷及び層状氷の破壊靭性

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概要

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• Fracture Toughness has been investigated on two types of polycrystalline ice, C.G.I. (columnar grained ice) and Lam. I. (laminated ice). The method of making C.G.I. bending specimens with a sharp notch was similar to that of L.G.I. (large grained ice) except the surface condition of the bottom plate where ice crystal growth starts. In this experiment, upper surface of the bottom plate was covered with ice granules. A bit of water was added to fill the clearances of the granules forming a flat ice plane. Lam. I. specimens were made, using molds float on the coolant of the temperature -10℃. Distilled water was put in the mold by a syringe a little at a time forming a Lam. I. block. This work has been done at room temperature. C.G.I. parallel specimens have been tested at temperature -10 and -30℃ with three fixed loading rate conditions K1=0.1, 1.0, and 10 MPam 1/2 /min in four point bend test. The effects of temperature and loading rate on the fracture toughness were observed. The results show that the fracture toughness decreases as loading rate K1 increases, and have a tendency to decreases as temperature T decreases. Two types of C.G.I. orthogonal specimens were tested in four point bending at -10℃ and K1=1.0 MPam1/2/min. These results were compared with the case of L.G.I. specimen already reported. The fracture toughness of Lam. I. specimen was also obtained at -10℃ in cantilever bending and three point bending.

• 長崎大学工学部,Faculty of Engineering, Nagasaki Universityの論文

著者

• 楠本 韶

  長崎大学工学部

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