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多結晶氷の破壊じん性値に及ぼす切欠き深さの影響


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Title: 多結晶氷の破壊じん性値に及ぼす切欠き深さの影響
Other Titles: Effects of Notch Depth on Fracture Toughness of Polycrystalline Ice
Authors: 内田, 武 / 楠本, 韶 / 越智, 利彦 / 梶, 聖悟
Authors (alternative): Uchida, Takeshi / Kusumoto, Sho / Ochi, Toshihiko / Kaji, Seigo
Issue Date: Aug-1988
Publisher: 長崎大学工学部 / Faculty of Engineering, Nagasaki University
Citation: 長崎大学工学部研究報告, 18(31), pp.84-91; 1988
Abstract: The effects of notch depth on fracture toughness KIC of C. G. I. (Columnar Grained Ice) were investigated using four types of sharply edge-notched specimens which had the ratio of the depth a of the notch to the height h of the specimen, 0.2, 0.4, 0.5 and 0.6, respectively. The notch of specimen was made by molding a thin razor blade (thickness 0.1mm, tip angle 9°) into the specimen in the process of the ice growing and removing it before test. Section size of specimen was 50mm×5Omm. Three point bending tests were conducted at two points of the loading rate KI, about 3 kPa√m/s (low loading rate) and about 200 k Pa√m/s (high loading rate). Testing temperature was -10℃. The results are as follows; (1) The effects of notch depth on the maximum fracture toughness KIC]max, the median of fracture toughness KIC]50% and the minimum fracture toughness KIC]min were hardly observed. The value of KIC]min was not affected by the loading rate KI. (2) The fracture surface changed from smooth to rough as the KIC value became higher. (3) The values of the ratio of the pop-in fracture toughness Kp to the fracture toughness KIC (KI at maximum load) showed wide scatter and the mean value was about 76%. (4) The pop-in crack has 2~3mm depth and is extending along the bottom of the notch across 1~3 crystal grains. (5) Start of the fracture of the specimen seems to have no correlation with the position of the first pop-in crack.
URI: http://hdl.handle.net/10069/24273
ISSN: 02860902
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:Volume 18, No. 31

Citable URI : http://hdl.handle.net/10069/24273

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