1992 Fiscal Year Final Research Report Summary
Development of Simulation Software for the Evaluation of Small Defects to Build a Remaining Life Assessment if High-Temperature Structures
| Project/Area Number |
03555015
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
機械材料工学
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
OHTANI Ryuichi Kyoto Univ., Engng., Prof., 工学部, 教授 (50025946)
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| Co-Investigator(Kenkyū-buntansha) |
NITTA Akito CRIEPI, FBR, Manager, FBR部, 室長
TOKIMASA Katsuyuki Sumitomo Metal, Elemen.Tech.Res., General Manager, 基盤技術研究部, 部長
KITAGAWA Masaki IHI, Struc.Mat.Tech., Manager, 構造材料部, 部長
TADA Naoya Kyoto Univ., Engng., Instructor, 工学部, 助手 (70243053)
KITAMURA Takayuki Kyoto Univ., Engng., Associate Prof., 工学部, 助教授 (20169882)
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| Project Period (FY) |
1991 – 1992
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| Keywords | High-temperature structural materials / Remaining life prediction / Small crack / Numerical simulation / Inverse method / Creep-fatigue |
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| Research Abstract |
In this research, a system and its software were newly developed for predicting remaining life of such high-temperature components as boilers and turbines, which comprise a fossil power plant. Results obtained here are summarized as follows :
1. To predict the initiation and propagation behavior of small creep-fatigue cracks, numerical simulation was carried out using a model of random fracture resistance of grain boundaries. A new system estimates components remaining lives based on the simulation results.
2. An inverse method of determining the simulation conditions, uiz. fracture driving force, from the actual distribution of small cracks was presented. This inverse method enabled us to introduce the simulation into the remaining life prediction system.
3. The validity of the inverse method was proved by applying this to the results for prescribed conditions. The method was valid even when driving force changed abruptly on the way.
4. To examine the applicability of the present system, numerical simulation for cracks under multi-axial loading or the on for cracks on a superalloy were investigated. Damage mechanics and creep deformation analysis were also discussed as a fundamental study in this research project.
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