著者

佐藤 一志 粟山 仁 橋田 俊之 高橋 秀明

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. A編 (ISSN:03875008)

巻号頁・発行日

vol.56, no.526, pp.1400-1405, 1990-06-25

被引用文献数

2 2

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The J-integral-based technique for measuring strain-softening curves is applied to determine the fracture toughness of granite. The measuring method has been recently proposed by Li for concrete. This method provides information on the fracture process zone formation and can be used for fracture toughness determination in strain-softening materials. CT specimens of three different sizes, 1.5inch, 2.5inch and 6inch CT were tested to examine the specimen size effect of measured strain-softening curves. Strain-softening curves measured on 2.5inch CT specimens are shown to be in good agreement with that determined from 6 inch CT specimens, indicating the possibility of determining the valid fracture toughness value by means of the J-integral-based technique. The test results for 1.5inch CT specimens, however, yield a lower fracture toughness value than that obtained on the other specimen sizes, suggesting the need of detailed investigations on specimen size requirements for the reliable use of subsized specimens. Finally, the strain-softening curves obtained by the J-based technique are compared with existing data determined by uniaxial tensile tests on several types of granite.

著者

舟山 直治 為岡 進 佐藤 一志

出版者

北海道開拓記念館

雑誌

基盤研究(C)

巻号頁・発行日

2005

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本研究課題は、北海道における民俗芸能の伝承者や伝承・保存会の活動など無形民俗資料について調査し、それぞれのデータを集積し、分類した。また、民俗芸能に係わる道具類など有形民俗資料調査を道内の神社および博物館で実施した。これら道内の民俗芸能にかかわる有形・無形のデータを時系列に整理し、伝承の系統図を作成するための基礎資料を作成した。あわせて成果を公開するためのデータベース構築に向けて調査を行った。