| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2011: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2009: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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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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