| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Outline of Final Research Achievements |
The object of this work was to develop a framework to account for the test specimen size effects on fracture toughness Jc of irradiated materials. Our perspective was that a mechanical driving factor such as the stress distribution difference can explain the size effects in Jc, at least for specimens specified in ASTM E1921 or equivalent. The results obtained were as follows: 1) Demonstrated that the cause of the size effects in Jc was due to the inability of J to characterize the crack-tip stress fields accurately. 2) Proposed a method to predict the lower bound Jc for large thickness specimens. 3) Proposed a framework to convert Jc between different specimen types and thicknesses by using finite element analysis and the modified Ritchie-Knott-Rice failure criterion. By utilizing these results, it is now possible to convert the Jc data accumulated in Japan for various specimen types and thicknesses to the Jc that is expected for a 1 inch CT specimen, recommended by IAEA.
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