Investigation and characterisation of surface cracks in metal components using time of flight diffraction (TOFD) technique in comparison to alternating current field measurement (ACFM) technique / Jeffry Jamil

Investigation and characterisation of surface cracks in metal components using time of flight diffraction (TOFD) technique in comparison to alternating current field measurement (ACFM) technique / Jeffry Jamil

This research describes an investigation and characterisation of Time of Flight Diffraction (TOFD) technique when it interacts with surface defects in metal component. Four steel plates of thickness 19 mm were used in this study. Electrical Discharge Machine (EDM) was used to fabricate the artificia...

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Main Author: Jamil, Jeffry
Format: Thesis
Language:English
Published: 2014
Online Access:https://ir.uitm.edu.my/id/eprint/17435/2/TM_JEFFRY%20JAMIL%20AS%2014_5.pdf
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spelling my-uitm-ir.174352022-04-11T01:57:12Z Investigation and characterisation of surface cracks in metal components using time of flight diffraction (TOFD) technique in comparison to alternating current field measurement (ACFM) technique / Jeffry Jamil 2014-08 Jamil, Jeffry This research describes an investigation and characterisation of Time of Flight Diffraction (TOFD) technique when it interacts with surface defects in metal component. Four steel plates of thickness 19 mm were used in this study. Electrical Discharge Machine (EDM) was used to fabricate the artificial surface cracks with various depths, angles and orientations. In case of TOFD technique, two TOFD probes of 5 MHz at angle 60° and 70° were used in this study with the different Probe Center Spacing (PCS). The latter was determined by using ESBeamTool software. Difficulty was experienced in using TOFD at an angle of 60° for detecting and sizing surface defects whereas successful results were achieved at angle 70°. The characteristic of defect signal was analysed based on surface defect severity. TOFD works well for most cases but surface crack that shallower cracks of 3.0 mm with inclination angle 40° (Notch 8) and 50° (Notch 9) could not be detected. This is due to the fact that crack signal were superimposed with the lateral wave and cannot be resolved separately. This is compliant with the proven practical limitation of the TOFD technique in detecting and sizing of shallower defects. The ACFM Standard Weld probe (256/5 kHz, TSC Inspection) was applied to the samples. The characteristic signals generated by the surface cracks obtained from Bx, Bz and 'butterfly plot' displays were evaluated using ASISTant software. In case comparison between ACFM and TOFD techniques, the study also revealed that small mean errors and standard deviation of depth and length using the ACFM technique makes more accurate than TOFD technique. The outcomes of these studies can be useful for planning an inspection of simple geometry component such as plate and pipe. 2014-08 Thesis https://ir.uitm.edu.my/id/eprint/17435/ https://ir.uitm.edu.my/id/eprint/17435/2/TM_JEFFRY%20JAMIL%20AS%2014_5.pdf text en public mphil masters Universiti Teknologi MARA Faculty of Applied Sciences Syed Yahya, Syed Yusainee (Dr.)
institution Universiti Teknologi MARA
collection UiTM Institutional Repository
language English
advisor Syed Yahya, Syed Yusainee (Dr.)
description This research describes an investigation and characterisation of Time of Flight Diffraction (TOFD) technique when it interacts with surface defects in metal component. Four steel plates of thickness 19 mm were used in this study. Electrical Discharge Machine (EDM) was used to fabricate the artificial surface cracks with various depths, angles and orientations. In case of TOFD technique, two TOFD probes of 5 MHz at angle 60° and 70° were used in this study with the different Probe Center Spacing (PCS). The latter was determined by using ESBeamTool software. Difficulty was experienced in using TOFD at an angle of 60° for detecting and sizing surface defects whereas successful results were achieved at angle 70°. The characteristic of defect signal was analysed based on surface defect severity. TOFD works well for most cases but surface crack that shallower cracks of 3.0 mm with inclination angle 40° (Notch 8) and 50° (Notch 9) could not be detected. This is due to the fact that crack signal were superimposed with the lateral wave and cannot be resolved separately. This is compliant with the proven practical limitation of the TOFD technique in detecting and sizing of shallower defects. The ACFM Standard Weld probe (256/5 kHz, TSC Inspection) was applied to the samples. The characteristic signals generated by the surface cracks obtained from Bx, Bz and 'butterfly plot' displays were evaluated using ASISTant software. In case comparison between ACFM and TOFD techniques, the study also revealed that small mean errors and standard deviation of depth and length using the ACFM technique makes more accurate than TOFD technique. The outcomes of these studies can be useful for planning an inspection of simple geometry component such as plate and pipe.
format Thesis
qualification_name Master of Philosophy (M.Phil.)
qualification_level Master's degree
author Jamil, Jeffry
spellingShingle Jamil, Jeffry
Investigation and characterisation of surface cracks in metal components using time of flight diffraction (TOFD) technique in comparison to alternating current field measurement (ACFM) technique / Jeffry Jamil
author_facet Jamil, Jeffry
author_sort Jamil, Jeffry
title Investigation and characterisation of surface cracks in metal components using time of flight diffraction (TOFD) technique in comparison to alternating current field measurement (ACFM) technique / Jeffry Jamil
title_short Investigation and characterisation of surface cracks in metal components using time of flight diffraction (TOFD) technique in comparison to alternating current field measurement (ACFM) technique / Jeffry Jamil
title_full Investigation and characterisation of surface cracks in metal components using time of flight diffraction (TOFD) technique in comparison to alternating current field measurement (ACFM) technique / Jeffry Jamil
title_fullStr Investigation and characterisation of surface cracks in metal components using time of flight diffraction (TOFD) technique in comparison to alternating current field measurement (ACFM) technique / Jeffry Jamil
title_full_unstemmed Investigation and characterisation of surface cracks in metal components using time of flight diffraction (TOFD) technique in comparison to alternating current field measurement (ACFM) technique / Jeffry Jamil
title_sort investigation and characterisation of surface cracks in metal components using time of flight diffraction (tofd) technique in comparison to alternating current field measurement (acfm) technique / jeffry jamil
granting_institution Universiti Teknologi MARA
granting_department Faculty of Applied Sciences
publishDate 2014
url https://ir.uitm.edu.my/id/eprint/17435/2/TM_JEFFRY%20JAMIL%20AS%2014_5.pdf
_version_ 1783733562089930752

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