Development of a framework to account for the test specimen size effects on fracture toughness of irradiated materials by considering the out-of-plane constraint
| Project/Area Number |
24561038
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Nuclear engineering
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| Research Institution | University of Fukui |
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Principal Investigator |
MESHII Toshiyuki 福井大学, 工学(系)研究科(研究院), 教授 (10313727)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| 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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| Keywords | 破壊靱性値 / 延性―脆性遷移温度域 / 照射脆化 / 試験片の寸法効果 / き裂先端の拘束 / T-stress / 有限要素解析 / 破壊評価基準 / 延性ー脆性遷移温度域 / 遷移温度域 / 三軸応力度 |
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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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Report
(4 results)
Research Products
(24 results)
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[Presentation] Validation of the (4δt，σ22c) failure criterion to explain the test specimen thickness of A533 Grade B steel in the ductile-to-brittle transition temperature region2014
Author(s)
Fujiwara, Y., Lu, K., Takamura, R., Fujita, Y. and Meshii, T.
Organizer
2014 ASME Pressure Vessels & Piping Conference
Place of Presentation
Anaheim, CA, USA
Related Report
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