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UT – SDH: Side Drilled Holes at different depths and Immersion probes

Global overview:

 

Immersion probes 2.25 MHz Ø19 mm 2.25 MHz Ø12.7 mm 2.25 MHz Ø6.35 mm 2.4 MHz Ø20 mm 4.5 MHz Ø12.7 mm 4.7 MHz Ø6.35 mm
P0° Done Done Done Done    
P45°       Done   Done
P60°       Done   Done
SV45°     Done Done Done Done
SV50°         Done Done
SV55°         Done Done
SV60°       Done Done  

 

Configuration

This validation experiment deals with Ø2 mm SDH at different depths. The measurements are performed upon a planar steel block containing Ø2 mm SDH from 4 to 60 mm depth with 4 mm steps. As a reminder, the steel parameters are: density 7.9, P waves velocity: 5900 m/s and SV waves velocity: 3230 m/s. Since the SDH are inspected perpendicularly to their axis, the SOV interaction model is considered.

Frequency Crystal Mode Water path Calibration depth
2.25 MHz 19 mm P0° 50 mm 20 mm
12.7 mm P0° 50 mm 12 mm
6.35 mm SV45°, P0° 20 mm 12 mm (P0°-20mm)
2.4 MHz 20 mm SV45°, SV60°, P45°, P60°, P0° 50 mm 32 mm (SV45°)
4.5 Mhz 12.7 mm SV45° à SV60° 20 mm 32 mm (SV45°)
4.7 MHz 6.35 mm P et SV, de 45°à 60° 25 mm 4 mm (P45°)

 

RESULTS

For each probe, the simulated P or/and SV beam radiated in the specimen and in the incidence plane is displayed for at least one configuration.

Conclusion

Results show a good agreement with generally less than 2 dB difference for mono-element immersion probes.

The discrepancy may be a little higher in the near field. This is due to limitations of the model and is explained in details for rectangular contact probes.

 

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