| Project/Area Number |
06650113
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Kyushu Institute of Technology |
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Principal Investigator |
HARADA Shoji Kyushu Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (80029199)
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| Co-Investigator(Kenkyū-buntansha) |
FUKUSHIMA Yoshihiro Kyushu Institute of Technology, Faculty of Engineering, Research Assistant, 工学部, 助手 (40156774)
KUROSHIMA Yoshihito Kyushu Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (50253547)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1995: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1994: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Fractal / LCF / Ductile Cast Iron / Computer Simulation / 3-D Distribution of SG / 黒鉛性状 / 疲労 / 疲労破面解析 / フラクタル / 内部き裂 / 黒鉛分布 |
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| Research Abstract |
To examine the effect of the morphology of spheroidal graphite (SG) on the LCF strength of ductile cast iron (DI) . LCF tests were conducted. In particular, specimens with different SG morphologies were prepared in FDI (ferritic ductile cast iron) . The results showed that a 3-D size distribution of large-sized SG strongly dominates the fatigue strength and mechanism of FDI.A computer simulation for LCF life evaluation revealed that the predicted fatigue life agrees well with the measured value.
A fractal-oriented LCF life estimation planned first produced insufficient results. That means, although the fractography of each ductile cast iron provided with the characteristic of fractal dimension, the crack growth resistance was not necessarily correlated with the fractal dimension. In this respect, a further study will be needed.
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