| Project/Area Number |
10650459
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
構造工学・地震工学
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| Research Institution | University of Tokyo |
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Principal Investigator |
TATEISHI Kazuo University of Tokyo, Institute of Industrial Science, Associate Professor., 生産技術研究所, 助教授 (80227107)
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| Co-Investigator(Kenkyū-buntansha) |
KATO Yoshitake University of Tokyo, Institute of Industrial Science, Research Associate., 生産技術研究所, 助手 (80272516)
UOMOTO Taketo University of Tokyo, Center for Collaborative Research, Professor., 国際・産学共同研究センター, 教授 (80114396)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1999: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1998: ¥2,700,000 (Direct Cost: ¥2,700,000)
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| Keywords | Low cycle fatigue / Acoustic Emission / Failure Mode |
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| Research Abstract |
In order to investigate the failure mechanism of steel material, the properties of acoustic emissions from the material were measured and analysed.
Particularly, low cycle fatigue failure was mainly investigated. Low cycle fatigue tests were carried out on a specimen modeling pressed welded joint of steel reinforing bars, and a specimen with hour-glass shape made from mild steel. In some specimens, mechanical flaws were incuded on purpose in order to investigate the relationship between failure mechanism and the properties of acoustic emission. In addition, strain levels were varied in order to change the low cycle failure modes of specimens.
Waveforms of aoustic emission were recorded by digital oscilloscope. Measured waveform was analysed from the viewpoints of frequency, occurrence time, etc. The relationship between these AE properties and failure mode depending on strain level and existance of mechanical flaws were investigated in detai.
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