EMAT (electromagnetic acoustic transducer) UT (ultrasonic testing) for thickness measurement and defect inspection on AM components
Additive manufacturing (AM) has reached widespread use in manufacturing industries in recent years. Defect inspection and geometric accuracy is critical in manufacturing for quality control. Ultrasonic testing (UT) is one of the best NDT methods used to detects flaws in AM products currently. EMA...
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Format: | Final Year Project |
Language: | English |
Published: |
Nanyang Technological University
2023
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Online Access: | https://hdl.handle.net/10356/167082 |
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Institution: | Nanyang Technological University |
Language: | English |
Summary: | Additive manufacturing (AM) has reached widespread use in manufacturing industries in
recent years. Defect inspection and geometric accuracy is critical in manufacturing for quality
control. Ultrasonic testing (UT) is one of the best NDT methods used to detects flaws in AM
products currently. EMAT is a way to perform UT which does not require contact with the test
piece as compared to Piezoelectric Transducers. This project will use electromagnetic acoustic
transducer (EMAT) to detect flaws in AM samples with rough surfaces. Conventional
Piezoelectric Transducer was also used as a reference to compare the results obtained from
using EMAT.
AM samples were drilled with side-drilled holes (SDH) and flat-bottomed holes (FBH) which
are common reference standards used in UT. Point pulse-echo testing were performed on the
samples using both EMAT and Piezoelectric Transducer. The A-scans of the defects obtained
were compared to evaluate the effectiveness of EMAT. EMAT is also useful for thickness
measurement and was performed on a Rusted Sample with a rough surface. These
measurements were then compared and evaluated.
It was concluded that EMAT is more effective in both defect measurement and thickness
measurement as compared to Piezoelectric Transducers, in terms of the signal-to-noise ratios
and peak values. |
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