Optimisation of the Half-Skip Total Focusing Method (HSTFM) parameters for sizing surface-breaking cracks
The Half-Skip Total Focusing Method (HSTFM) is an ultrasonic array post-processing (imaging) technique. The method allows surface-breaking cracks (SBCs) to be imaged and also sized using 6 dB drop rule. The HSTFM has previously been used to size SBCs initiating from flat and horizontal walls. Howeve...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/161196 |
| _version_ | 1826112062653202432 |
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| author | Saini, Abhishek Felice, Maria V. Fan, Zheng Lane, Christopher J. L. |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Saini, Abhishek Felice, Maria V. Fan, Zheng Lane, Christopher J. L. |
| author_sort | Saini, Abhishek |
| collection | NTU |
| description | The Half-Skip Total Focusing Method (HSTFM) is an ultrasonic array post-processing (imaging) technique. The method allows surface-breaking cracks (SBCs) to be imaged and also sized using 6 dB drop rule. The HSTFM has previously been used to size SBCs initiating from flat and horizontal walls. However, there has been limited research to optimise the method in a rigours manner and quantitatively determine the performance of the HSTFM to size cracks accurately. In this paper, the SBCs characterization capability of the HSTFM was tested and applied on both numerically simulated and experimentally generated data. Under numerical simulation, considering the travel time of ultrasonic signals as per the ray theory, first, a mathematical framework was developed for the HSTFM imaging algorithm. Then, a quantitative parametric study, using the finite element method and point reflector model, was performed to evaluate the sizing capability of the HSTFM under different scenarios. These scenarios include the position of the ultrasonic array relative to the crack, the accuracy of the acoustic velocity, the height of the sample, the slope of the back wall, and the tilting angle of the defect. For each of the array configuration, the crack-sizing range (the smallest and largest Through Wall Extent (TWE) of a crack) that can be measured using the HSTFM was calculated. Thereafter, experimental validation was performed, where an excellent match with the numerical results was observed. |
| first_indexed | 2024-10-01T03:00:49Z |
| format | Journal Article |
| id | ntu-10356/161196 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:00:49Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1611962022-08-19T03:52:59Z Optimisation of the Half-Skip Total Focusing Method (HSTFM) parameters for sizing surface-breaking cracks Saini, Abhishek Felice, Maria V. Fan, Zheng Lane, Christopher J. L. School of Mechanical and Aerospace Engineering Engineering::Materials Surface-Breaking Cracks Defect Sizing The Half-Skip Total Focusing Method (HSTFM) is an ultrasonic array post-processing (imaging) technique. The method allows surface-breaking cracks (SBCs) to be imaged and also sized using 6 dB drop rule. The HSTFM has previously been used to size SBCs initiating from flat and horizontal walls. However, there has been limited research to optimise the method in a rigours manner and quantitatively determine the performance of the HSTFM to size cracks accurately. In this paper, the SBCs characterization capability of the HSTFM was tested and applied on both numerically simulated and experimentally generated data. Under numerical simulation, considering the travel time of ultrasonic signals as per the ray theory, first, a mathematical framework was developed for the HSTFM imaging algorithm. Then, a quantitative parametric study, using the finite element method and point reflector model, was performed to evaluate the sizing capability of the HSTFM under different scenarios. These scenarios include the position of the ultrasonic array relative to the crack, the accuracy of the acoustic velocity, the height of the sample, the slope of the back wall, and the tilting angle of the defect. For each of the array configuration, the crack-sizing range (the smallest and largest Through Wall Extent (TWE) of a crack) that can be measured using the HSTFM was calculated. Thereafter, experimental validation was performed, where an excellent match with the numerical results was observed. Nanyang Technological University National Research Foundation (NRF) This research work was conducted in the SMRT-NTU Smart Urban Rail Corporate Laboratory with funding support from the National Research Foundation (NRF), SMRT and Nanyang Technological University. 2022-08-19T03:52:59Z 2022-08-19T03:52:59Z 2020 Journal Article Saini, A., Felice, M. V., Fan, Z. & Lane, C. J. L. (2020). Optimisation of the Half-Skip Total Focusing Method (HSTFM) parameters for sizing surface-breaking cracks. NDT & E International, 116, 102365-. https://dx.doi.org/10.1016/j.ndteint.2020.102365 0963-8695 https://hdl.handle.net/10356/161196 10.1016/j.ndteint.2020.102365 2-s2.0-85092114602 116 102365 en NDT & E International © 2020 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Materials Surface-Breaking Cracks Defect Sizing Saini, Abhishek Felice, Maria V. Fan, Zheng Lane, Christopher J. L. Optimisation of the Half-Skip Total Focusing Method (HSTFM) parameters for sizing surface-breaking cracks |
| title | Optimisation of the Half-Skip Total Focusing Method (HSTFM) parameters for sizing surface-breaking cracks |
| title_full | Optimisation of the Half-Skip Total Focusing Method (HSTFM) parameters for sizing surface-breaking cracks |
| title_fullStr | Optimisation of the Half-Skip Total Focusing Method (HSTFM) parameters for sizing surface-breaking cracks |
| title_full_unstemmed | Optimisation of the Half-Skip Total Focusing Method (HSTFM) parameters for sizing surface-breaking cracks |
| title_short | Optimisation of the Half-Skip Total Focusing Method (HSTFM) parameters for sizing surface-breaking cracks |
| title_sort | optimisation of the half skip total focusing method hstfm parameters for sizing surface breaking cracks |
| topic | Engineering::Materials Surface-Breaking Cracks Defect Sizing |
| url | https://hdl.handle.net/10356/161196 |
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