| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
To use second harmonic ultrasonic waves for bolt conclusion evaluation, the relation between the contact area (length) of bolt-nut surfaces that are generated second harmonic waves because of CAN (Contact Acoustic Non-linearity) and wave length of ultrasonic waves was confirmed using FEM simulation and several experiments. Therefore, location for detecting second harmonic waves or applicable bolt length and diameter were also influenced. Moreover, in practice, seal or adhesive are used, whose characteristics for ultrasonic transmission or absorption will be required to evaluate bolt conclusions.
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