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Title :Testing Method for Determination of Microscopic Fracture Toughness for Rock Materials
Authors :Kataoka, Minami
Jeong, SangSon
Obara, Yuzo
Yoshinaga, Toru
Mine, Yoji
Takashima, Kazuki
Issue Date :Nov-2018
Citation jtitle :Geotechnical Testing Journal
vol. :41
no. :6
start page :1092
end page :1101
Abstract :The fracture behavior of rocks is known to depend on the microstructures of the rocks: the distribution and orientation of the microcracks, and the type, size, and shape of mineral grains. To explain quantitatively the effect of the microstructures on the fracture of rocks, the determination of the fracture toughness of grain and grain boundaries, namely, the microscopic fracture toughness (MFT), is necessary. The authors developed a testing method for determination of MFT for rock materials. A microsized specimen of a cantilever beam type with dimensions of 10 by 10 by 50 μm was used in this testing method, and we built a special testing machine for this specimen. Microsized specimens were made within grains of Iksan granite by Focused Ion Beam machining, and the MFT of its constituents—plagioclase, alkali feldspar, and quartz—was determined using this testing method at room temperature. The MFT varied widely and the results are discussed based on the mineralogical knowledge. This testing method will be helpful to more accurately interpret the fracture behavior.
URL :https://www.astm.org/DIGITAL_LIBRARY/JOURNALS/GEOTECH/PAGES/GTJ20170183.htm
Type Local :雑誌掲載論文
ISSN :01496115
Publisher :ASTM International
Rights :© 2018 by ASTM International
URI :http://hdl.handle.net/2298/43182
Appears in Collections:Journal Article (Technology)
Please use this identifier to cite or link to this item: http://hdl.handle.net/2298/43182