Journal
APPLIED PHYSICS EXPRESS
Volume 14, Issue 12, Pages -Publisher
IOP Publishing Ltd
DOI: 10.35848/1882-0786/ac3d1e
Keywords
nondestructive testing; nonlinear ultrasonics; ultrasonic phased array; plane wave imaging; closed cracks; crack opening; closing behaviors
Categories
Funding
- JSPS KAKENHI [19K21910, 21H04592]
- JST FOREST program [JPMJFR2023]
- Grants-in-Aid for Scientific Research [19K21910, 21H04592] Funding Source: KAKEN
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A novel closed-crack imaging technique combining ultrafast phased-array with pump excitation has been proposed and successfully proven in a closed fatigue crack specimen. The technique effectively induces crack opening/closing behaviors and stroboscopically captures high-speed crack dynamics induced by pump excitation.
Nondestructive evaluation of closed cracks is one of the most challenging problems in ultrasonic testing. Here, we propose a novel closed-crack imaging technique combining ultrafast phased-array with pump excitation. The pump excitation with kHz frequency can effectively induce the crack opening/closing behaviors since it can generate a large displacement of 1000 nm order. At the same time, ultrafast phased-array imaging, i.e. plane wave imaging, with MHz frequency stroboscopically captures the high-speed crack dynamics induced by pump excitation. We successfully proved the concept in a closed fatigue crack specimen.
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