Online monitoring of fatigue damage in welded joints using diffuse ultrasound
Fatigue damage is a common cause of failure in welded structures, and it is often difficult to detect it in the early stage. While ultrasonic-based methods can effectively monitor crack propagation, it remains a significant challenge to indicate the initiation of cracks. In this study, a novel metho...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/173254 |
| _version_ | 1811697149334781952 |
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| author | Gao, Shuling Zhang, Rui Fan, Zheng Li, Ning Yue, Yanan Xie, Lili |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Gao, Shuling Zhang, Rui Fan, Zheng Li, Ning Yue, Yanan Xie, Lili |
| author_sort | Gao, Shuling |
| collection | NTU |
| description | Fatigue damage is a common cause of failure in welded structures, and it is often difficult to detect it in the early stage. While ultrasonic-based methods can effectively monitor crack propagation, it remains a significant challenge to indicate the initiation of cracks. In this study, a novel method is proposed to monitor the diffuse ultrasonic field affected by ratcheting strain and microcracks formed in welded joints during fatigue degradation. The energy density in the diffuse ultrasonic signal is computed and correlated with different fatigue cycles, allowing for online monitoring of fatigue damage in welded joints. Six butt and cross-welded joints were studied under different fatigue conditions, and digital image correlation (DIC) technology was used for comparison throughout the fatigue tests. The results indicate that the correlation coefficient of the energy density in diffuse ultrasound exhibits a significant decreasing trend when crack initiation occurs, providing a unique signal to indicate crack initiation in welded joints. This signal may appear earlier than that from ratcheting strain monitored by DIC due to ultrasound's sensitivity to internal damages. |
| first_indexed | 2024-10-01T07:50:40Z |
| format | Journal Article |
| id | ntu-10356/173254 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:50:40Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1732542024-01-22T04:32:25Z Online monitoring of fatigue damage in welded joints using diffuse ultrasound Gao, Shuling Zhang, Rui Fan, Zheng Li, Ning Yue, Yanan Xie, Lili School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Diffuse Ultrasound Fatigue Damage Monitoring Fatigue damage is a common cause of failure in welded structures, and it is often difficult to detect it in the early stage. While ultrasonic-based methods can effectively monitor crack propagation, it remains a significant challenge to indicate the initiation of cracks. In this study, a novel method is proposed to monitor the diffuse ultrasonic field affected by ratcheting strain and microcracks formed in welded joints during fatigue degradation. The energy density in the diffuse ultrasonic signal is computed and correlated with different fatigue cycles, allowing for online monitoring of fatigue damage in welded joints. Six butt and cross-welded joints were studied under different fatigue conditions, and digital image correlation (DIC) technology was used for comparison throughout the fatigue tests. The results indicate that the correlation coefficient of the energy density in diffuse ultrasound exhibits a significant decreasing trend when crack initiation occurs, providing a unique signal to indicate crack initiation in welded joints. This signal may appear earlier than that from ratcheting strain monitored by DIC due to ultrasound's sensitivity to internal damages. Agency for Science, Technology and Research (A*STAR) The authors gratefully acknowledge the support of Key Program of Key Research and Development Program of Tianjin, China (grant No. 20YFZCSN00900), National Nature Science Foundation (grant No. 52178496), National Key R & D Program of China (grant No. 2019YFE0112500), China Scholarship Council (grant No. 202106250141), and Tianjin Research Innovation Project for Postgraduate Students (grant No. 2020YJS086) towards this research. This work was also supported by A*STAR Science and Engineering Research Council (grant No. SERC A19F1a0104). 2024-01-22T04:32:25Z 2024-01-22T04:32:25Z 2024 Journal Article Gao, S., Zhang, R., Fan, Z., Li, N., Yue, Y. & Xie, L. (2024). Online monitoring of fatigue damage in welded joints using diffuse ultrasound. Ultrasonics, 138, 107191-. https://dx.doi.org/10.1016/j.ultras.2023.107191 0041-624X https://hdl.handle.net/10356/173254 10.1016/j.ultras.2023.107191 38006627 2-s2.0-85178074923 138 107191 en SERC A19F1a0104 Ultrasonics © 2023 Elsevier B.V. All rights reserved. |
| spellingShingle | Engineering::Mechanical engineering Diffuse Ultrasound Fatigue Damage Monitoring Gao, Shuling Zhang, Rui Fan, Zheng Li, Ning Yue, Yanan Xie, Lili Online monitoring of fatigue damage in welded joints using diffuse ultrasound |
| title | Online monitoring of fatigue damage in welded joints using diffuse ultrasound |
| title_full | Online monitoring of fatigue damage in welded joints using diffuse ultrasound |
| title_fullStr | Online monitoring of fatigue damage in welded joints using diffuse ultrasound |
| title_full_unstemmed | Online monitoring of fatigue damage in welded joints using diffuse ultrasound |
| title_short | Online monitoring of fatigue damage in welded joints using diffuse ultrasound |
| title_sort | online monitoring of fatigue damage in welded joints using diffuse ultrasound |
| topic | Engineering::Mechanical engineering Diffuse Ultrasound Fatigue Damage Monitoring |
| url | https://hdl.handle.net/10356/173254 |
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