| Project/Area Number |
09450377
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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 |
海洋工学
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| Research Institution | Osaka University |
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Principal Investigator |
TOMITA Yasumitsu Osaka Univ., Graduate School of Eng., Professor, 大学院・工学研究科, 教授 (30029251)
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| Co-Investigator(Kenkyū-buntansha) |
SUMI Yohichi Yokohama National Univ., Faculty of Eng., Professor, 工学部, 教授 (80107367)
HASHIMOTO Kiyoshi Osaka Univ., Graduate School of Eng., Research Assistant, 大学院・工学研究科, 助手 (50183554)
OSAWA Naoki Osaka Univ., Graduate School of Eng., Assistant Professor, 大学院・工学研究科, 助教授 (90252585)
FUKASAWA Toichi Kanazawa Institute of Technology, Faculty of Eng., Professor, 工学部, 教授 (80143171)
FUJIMOTO Yukio Hiroshima Univ., Faculty of Eng., Professor, 工学部, 教授 (60136140)
船木 俊彦 大阪大学, 工学部, 教授 (90029174)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥9,200,000 (Direct Cost: ¥9,200,000)
Fiscal Year 1999: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1998: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1997: ¥4,900,000 (Direct Cost: ¥4,900,000)
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| Keywords | fatigue design / ship structural member / ocean going / fatigue strength / crack growth / loading model |
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| Research Abstract |
In order to develop a more reliable and accurate fatigue design method for ship structural members, a new type of fatigue design chart is proposed. These charts are derived by the following three procedures : (1) use of fatigue crack growth analysis as the basis for fatigue strength evaluation, (2) implementation of the authors' new storm model for the time history of stress occurrence induced by wave load and (3) incorporation of a new sailing model instead of the all headings model. The charts are 3-dimensional and are composed of the following three parameters : 1) maximum stress amplitude in the external load, 2) stress concentration factor and 3) fatigue crack length in cracked structural members. They can be prepared for any fatigue life and be used for initial fatigue design instead of the current fatigue design code. They also predict the residual fatigue life in cracked structural members when fatigue cracks are found after a certain service period.
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