Evaluation of lift-off effect on surface defect metal with non non-conductive coating by using eddy current testing technique

Eddy Current Testing (ECT) technique is a Non-Destructive Testing (NDT) method widely used in industries. The advantages of using the Eddy Current Testing technique are highly capable of detecting surface defects, determining material properties, e.g., conductivity and electrical permeability, measu...

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Main Author:	Syafiqa Putri Adlina Harun
Format:	Thesis
Language:	English English
Published:	2023
Subjects:	TA401-492 Materials of engineering and construction Mechanics of materials
Online Access:	https://eprints.ums.edu.my/id/eprint/40702/1/24%20PAGES.pdf https://eprints.ums.edu.my/id/eprint/40702/2/FULLTEXT.pdf
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spelling	my-ums-ep.407022024-08-28T01:07:30Z Evaluation of lift-off effect on surface defect metal with non non-conductive coating by using eddy current testing technique 2023 Syafiqa Putri Adlina Harun TA401-492 Materials of engineering and construction. Mechanics of materials Eddy Current Testing (ECT) technique is a Non-Destructive Testing (NDT) method widely used in industries. The advantages of using the Eddy Current Testing technique are highly capable of detecting surface defects, determining material properties, e.g., conductivity and electrical permeability, measuring the thickness of materials, and performing nonconductive coatings on metal testing. However, the main obstacle of ECT is difficulty in detecting deeper defects and the undesirable lift-off distance between the sample and the sensor. Moreover, when applying the eddy current testing approach, nonmagnetic coating thickness variation frequently impedes flaw detection in metal testing. This research aims to develop the eddy current testing probe that generates eddy current signals when a coil is placed above each metal testing, i.e., copper 101, aluminium 6061, and stainless steel 304, with and without nonconductive coating and the presence of lift-off height, i.e., 0 mm, 2.5 mm, 5.0mm, 7.5 mm, and 10.0 mm. In addition, each metal test has a variety of thicknesses, i.e., 1.5 mm, 3.0 mm, and 5.0 mm, and an artificial surface defect, i.e., 10 mm, 20 mm, and 30 mm, engraved on each metal testing. The coil probe is a rod-shaped solenoid coil designed with an iron core with 65 mm length, 5 mm area, and 200 N turns. It demonstrates how the rod-shaped solenoid coil may be used to detect various surface defects in copper 101 (C101), aluminium 6061 (Al6061), and stainless steel 304 (SS304). The optimal frequencies for C101 were 7.850 MHz, aluminium Al6061was 7.383 MHz, and SS304 metal was 7.956 MHz. In conclusion, the output voltage signals for larger surface defect sizes increase but decrease as the thickness becomes thicker. Furthermore, as the lift-off height increases, the output voltage for both coated and non-coated metal decreases accordingly. Therefore, besides comparing the output voltage for coated and non-coated metals, there are minor differences which shows that the ECT technique in this research can still detect surface defects appropriately. 2023 Thesis https://eprints.ums.edu.my/id/eprint/40702/ https://eprints.ums.edu.my/id/eprint/40702/1/24%20PAGES.pdf text en public https://eprints.ums.edu.my/id/eprint/40702/2/FULLTEXT.pdf text en validuser masters Universiti Malaysia Sabah Faculty of Science and Natural Resources
institution	Universiti Malaysia Sabah
collection	UMS Institutional Repository
language	English English
topic	TA401-492 Materials of engineering and construction Mechanics of materials
spellingShingle	TA401-492 Materials of engineering and construction Mechanics of materials Syafiqa Putri Adlina Harun Evaluation of lift-off effect on surface defect metal with non non-conductive coating by using eddy current testing technique
description	Eddy Current Testing (ECT) technique is a Non-Destructive Testing (NDT) method widely used in industries. The advantages of using the Eddy Current Testing technique are highly capable of detecting surface defects, determining material properties, e.g., conductivity and electrical permeability, measuring the thickness of materials, and performing nonconductive coatings on metal testing. However, the main obstacle of ECT is difficulty in detecting deeper defects and the undesirable lift-off distance between the sample and the sensor. Moreover, when applying the eddy current testing approach, nonmagnetic coating thickness variation frequently impedes flaw detection in metal testing. This research aims to develop the eddy current testing probe that generates eddy current signals when a coil is placed above each metal testing, i.e., copper 101, aluminium 6061, and stainless steel 304, with and without nonconductive coating and the presence of lift-off height, i.e., 0 mm, 2.5 mm, 5.0mm, 7.5 mm, and 10.0 mm. In addition, each metal test has a variety of thicknesses, i.e., 1.5 mm, 3.0 mm, and 5.0 mm, and an artificial surface defect, i.e., 10 mm, 20 mm, and 30 mm, engraved on each metal testing. The coil probe is a rod-shaped solenoid coil designed with an iron core with 65 mm length, 5 mm area, and 200 N turns. It demonstrates how the rod-shaped solenoid coil may be used to detect various surface defects in copper 101 (C101), aluminium 6061 (Al6061), and stainless steel 304 (SS304). The optimal frequencies for C101 were 7.850 MHz, aluminium Al6061was 7.383 MHz, and SS304 metal was 7.956 MHz. In conclusion, the output voltage signals for larger surface defect sizes increase but decrease as the thickness becomes thicker. Furthermore, as the lift-off height increases, the output voltage for both coated and non-coated metal decreases accordingly. Therefore, besides comparing the output voltage for coated and non-coated metals, there are minor differences which shows that the ECT technique in this research can still detect surface defects appropriately.
format	Thesis
qualification_level	Master's degree
author	Syafiqa Putri Adlina Harun
author_facet	Syafiqa Putri Adlina Harun
author_sort	Syafiqa Putri Adlina Harun
title	Evaluation of lift-off effect on surface defect metal with non non-conductive coating by using eddy current testing technique
title_short	Evaluation of lift-off effect on surface defect metal with non non-conductive coating by using eddy current testing technique
title_full	Evaluation of lift-off effect on surface defect metal with non non-conductive coating by using eddy current testing technique
title_fullStr	Evaluation of lift-off effect on surface defect metal with non non-conductive coating by using eddy current testing technique
title_full_unstemmed	Evaluation of lift-off effect on surface defect metal with non non-conductive coating by using eddy current testing technique
title_sort	evaluation of lift-off effect on surface defect metal with non non-conductive coating by using eddy current testing technique
granting_institution	Universiti Malaysia Sabah
granting_department	Faculty of Science and Natural Resources
publishDate	2023
url	https://eprints.ums.edu.my/id/eprint/40702/1/24%20PAGES.pdf https://eprints.ums.edu.my/id/eprint/40702/2/FULLTEXT.pdf
_version_	1811770547276611584

Evaluation of lift-off effect on surface defect metal with non non-conductive coating by using eddy current testing technique

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