| Project/Area Number |
23560518
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Measurement engineering
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| Research Institution | Oita National College of Technology |
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Principal Investigator |
OKA Mohachiro 大分工業高等専門学校, 情報工学科, 教授 (80107838)
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| Co-Investigator(Renkei-kenkyūsha) |
YAKUSHIJI Terutosi 大分工業高等専門学校, 機械工学科, 教授 (90210228)
ENOKIZONO Masato 大分大学, 工学部電気電子工学科, 教授 (40136784)
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| Project Period (FY) |
2011 – 2013
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2011: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 疲労破壊 / 疲労 / 磁気センサ / 渦電流法 / 直流磁界 / 鉄系構造材 / 非破壊検査 |
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| Research Abstract |
In the fatigue evaluation of an iron-based structural material, the inductance method that uses a pancake-type coil is reported to be effective. This method cannot evaluate the inside fatigue of a specimen because the eddy current does not penetrate into the inside of a specimen through the skin effect. In this method, the accuracy of the fatigue evaluation depends on the surface condition of a specimen. In this study we applied pulsating tension fatigue. We achieved the following results. The detection of pulsating tension fatigue of specimens made of low carbon steel was originally possible by the inductance method which used 10kHz as a excitation frequency. We attempted the improvement of the sensibility using the inductance method excited in the low frequency together with the dc magnetization method that used Nd magnets. This method could evaluate pulsating tension fatigue of a specimen irrespective of the surface condition.
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