| Budget Amount *help |
¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2017: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2016: ¥10,790,000 (Direct Cost: ¥8,300,000、Indirect Cost: ¥2,490,000)
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| Outline of Final Research Achievements |
The nonlinear frequency mixing phenomenon of ultrasonic waves at contacting interfaces of solid bodies has been studied theoretically and experimentally. Namely, the frequency mixing and the harmonic generation phenomena have been analyzed theoretically based on a nonlinear spring-type interface model to elucidate the influence of the frequencies and angles of the incident waves and the linear and nonlinear parameters of the interface. Some qualitative features obtained by the analysis have been confirmed by the experiments for the contacting interface between two aluminum alloy blocks. Furthermore, the frequency mixing due to the material nonlinearity as well as the linear/nonlinear behavior of ultrasonic waves at closed defects have been studied. This study has provided some basic findings related to the nondestructive evaluation of closed defects using the frequency mixing characteristics.
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