Sizing indications with ultrasonics can be challenging. For large indications sizing by probe travel is appropriate, for indications smaller than the beam width amplitude-based sizing (https://youtu.be/zZroaqqDGug), but what about indications smaller than the wavelength. This video is all about those TINY defects and why you should NEVER use Flat Bottom Holes smaller than ¼ of the wavelength!
► Paper: Correct sizing of reflectors smaller than one wavelength
https://www.researchgate.net/publication/325597212
► Ultrasonic Testing Sizing Method Comparison & Limitations
https://youtu.be/zZroaqqDGug
► Basics of Ultrasonic Testing and Sizing
https://youtu.be/5Pg21GHtKO8
► Ultrasonic Calibration and Sizing with DGS (AVG)
https://youtu.be/OeDGVhwU5lE
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Links to the individual sections of this video:
0:00 Welcome
2:15 Short Repeat: Basics of UT Sizing
3:54 Short Repeat: UT Sizing using DGS
4:55 Short Repeat: UT Sizing Limitations
6:21 How to determine the lower limit?
9:01 Defect Abstraction Chain
11:05 Why is an FBH not a good model for a small defect: Kirchhoff Approximation
12:55 Challenges
13:30 EFIT: Elastodynamic Finite Integration Technique
15:32 EFIT Results: Disc-Shaped Reflector
17:23 EFIT Results: Flat Bottom Hole
18:01 Step 1 Simulations using DSRs
20:35 Scattering differences between large and small reflectors
22:21 Undersizing of small indications using DGS (AVG)
23:05 Understanding the reflection differences between large and small indications
25:48 Step 1 Summary: Use of DGS diagrams for sizing of small indications
26:51 Step 2 Simulations using FBHs
27:22 Undersizing of small indications using DAC
27:58 Step 2 Summary: Use of DAC for sizing of small indications
28:39 Step 3 Extended DGS Diagram
29:55 Summary
30:44 Final Thoughts
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UT Videos:
► History of Ultrasonic Testing
https://youtu.be/WzcbFUOlFwU
► Basics of Ultrasonic Testing and Sizing
https://youtu.be/5Pg21GHtKO8
► Basic Acoustic / Ultrasonic Waveforms, Refraction & Snells Law
https://youtu.be/dt-1Pe_g5vE
► Working Principle of Phased Array Ultrasonic Testing
https://youtu.be/g4C-zh51FM0
► Automated Ultrasonic Testing
https://youtu.be/bv_gtaVpM-w
► Basics of the Ultrasonic Sound Field and why some of your training material might not be adequate
https://youtu.be/xWRABwg1TB8
► How to Determine the Optimal Scanning Grid for Your Ultrasonic Inspection
https://youtu.be/WjeeG1YuSIs
► Ultrasonic Calibration and Sizing with DGS (AVG)
https://youtu.be/OeDGVhwU5lE
► Ultrasonic Testing: Can I detect what I am required to detect?
https://youtu.be/HnPszesvK3w
► Ultrasonic Computed Tomography / SAFT: The Next Generation of Ultrasonic Testing
https://youtu.be/A3WU-loTczU
► QSAFT: Growing SAFT from an Imaging Tool to a Complete Quantitative NDT Technique
https://youtu.be/-dPkgov5E-M
► Ultrasonic Testing Sizing Method Comparison & Limitations
https://youtu.be/zZroaqqDGug
► The Future of Phased Array Ultrasonic Testing: FMC / TFM
https://youtu.be/qqCiHBj0RnQ
► Sizing of Small Defects with Ultrasonic Testing
https://youtu.be/mr778r1uStw
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NDE 4.0 Videos:
► NDE 4.0
https://www.youtube.com/playlist?list=PLS14b2YI9uyXDTlikIh7yyFw9p_T-DPHs
► Artificial Intelligence
https://www.youtube.com/playlist?list=PLS14b2YI9uyW6WMShrfFdDl_BMFqtY78E
► Digital Twin
https://www.youtube.com/playlist?list=PLS14b2YI9uyUMqgNa3-GhdNO9_vw_ihZG
► Cyber-Physical Loops
https://www.youtube.com/playlist?list=PLS14b2YI9uyXfhrrSr_LbIiKZvG-0Bs9U
► Industrial Internet of Things
https://www.youtube.com/playlist?list=PLS14b2YI9uyXa2zRnOD0CeFyAJCtvcXIX
► Quantum Computers
https://www.youtube.com/playlist?list=PLS14b2YI9uyXJMNEydylUMjwepKauO8Vg
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If you want to reach me (Johannes Vrana) or my company (Vrana GmbH):
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#nde40 #ultrasound #ultrasonictesting #sizing #wavelength #kirchhoff #kirchhoffslaw #nondestructivetesting