2011 Fiscal Year Final Research Report
Real-time ultrasonic measurement of fatigue crack at bolt joints
| Project/Area Number |
21560077
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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 |
Materials/Mechanics of materials
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| Research Institution | Saitama University |
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Principal Investigator |
KATO Hiroshi 埼玉大学, 大学院・理工学研究科, 教授 (80107375)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 品質管理システム / ボルト締結 / 疲労損傷 / 非破壊検査 / 超音波測定 / アルミニウム合金 / 表面弾性波 |
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| Research Abstract |
It is vital to detect the fatigue crack appearing at the bolt joints for their safely, but it is unable to see the crack since it is covered by the bolt head. The present work was carried out to detect the fatigue crack appearing at the bolt joints by the ultrasonic measurement. A small crack less than 100 μm in length was detected at the bolt joints by using the surface acoustic wave (SAW), and also the length and the depth of the crack was evaluated. Then, the SAW intensity change following the crack opening/closing behavior of the fatigue crack was detected in one fatigue cycle.
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