| Project/Area Number |
13450405
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
船舶工学
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| Research Institution | Hiroshima University |
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Principal Investigator |
KITAMURA Mitsuru Hiroshima University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (40195293)
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| Co-Investigator(Kenkyū-buntansha) |
SHINOZAKI Kenji Hiroshima University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (70154218)
YAMAMOTO Motomichi Hiroshima University, Graduate School of Engineering, Research Associate, 大学院・工学研究科, 助手 (30274111)
HAMADA Kunihiro Hiroshima University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (40294540)
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| Project Period (FY) |
2001 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥9,700,000 (Direct Cost: ¥9,700,000)
Fiscal Year 2003: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2002: ¥4,800,000 (Direct Cost: ¥4,800,000)
Fiscal Year 2001: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Keywords | liquation crack / hot crack / finite element method / three-dimensional / elastic-plastic / elevated temperature / heat affected zone (NAZ) / laser welding / 3次元熱伝導解析手法 / 3次元熱弾塑性歪み解析手法 / 電子ビーム溶接 / 高温歪み計測 / 溶接熱影響部 / 3次元解析モデル / 相変化 / 高温割れ / 非線形解析 / 溶融凝固 / 溶接 / 熱伝導解析 / 潜熱 / 応力解析 / 陽解法 |
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| Research Abstract |
The object of this study is to make clear and obtain hot crack phenomenon at the heat affected zone (HAZ) of a weldedment from the view point of dynamics. Especially, the main object is to investigate and propose the three-dimensional thermal elastic-plastic analysis model/method for the weldment under the conditions of elevated temperature and large nonlinearity. The summary of this study is as following.
The new-type of the three-dimensional thermal elastic-plastic analysis model/method was proposed and validated, which was able to apply for laser/electron-beam welding methods in addition to an arc welding method. The high-accuracy analysis with finite element method was able to be proposed by using the new-type special method of setting of a material constant at elevated temperature, of dealing of a molten metal, of setting of a heat source and so on.
The new-type method for accurate and dynamic measurement of the temperature and strain at the elevated temperature zone very near the molten part was investigated and proposed. Moreover an actual measurement by using the proposed method was carried out. The proposed new-type analysis method was able to be validated by comparing the analysis result to the measurement result in detail.
Furthermore, the new-type evaluating/prediction method for liquation cracking at HAZ of a weldedment was proposed based on the equivalent-plastic strain obtained from the above analysis method.
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