2009 Fiscal Year Final Research Report
Bolt Conclusion Evaluation System using Nonlinear Ultrasonic Pulse Waves
| Project/Area Number |
20860020
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| Research Category |
Grant-in-Aid for Young Scientists (Start-up)
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| Allocation Type | Single-year Grants |
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| Research Field |
Measurement engineering
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| Research Institution | Akita University |
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Principal Investigator |
FUKUDA Makoto Akita University, 工学資源学部・電気電子工学科, 助教 (50507671)
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| Project Period (FY) |
2008 – 2009
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| Keywords | 計測工学 / 機械材料・材料力学 / 解析・評価 |
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| Research Abstract |
This study investigates the use of ultrasonic second harmonic components in the quality control of bolt fastened structures. The second harmonic components from a fastened bolt were detected using a double-layered piezoelectric ultrasonic transducer (DLPT). The fundamental ultrasonic pulse waves (1MHz) are transmitted when the DLPT is electrically connected in parallel, while the second harmonic ultrasonic components (2MHz) are detected when the DLPT is connected in series. A hexagon head bolt (the diameter and length of the screw are 12mm and 100mm) was used in the experiments. The bolt was fastened by an axial force of 20kN. The second harmonic component increased by approximately 15dB before and after the bolt was fastened.
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