AE characteristic for monitoring of fatigue crack in steel bridge members

Dong-Jin Yoon; Juong-Chae Jung; Philip Park; Seung-Seok Lee

doi:10.1117/12.387856

9 June 2000 AE characteristic for monitoring of fatigue crack in steel bridge members

Dong-Jin Yoon, Juong-Chae Jung, Philip Park, Seung-Seok Lee

Proceedings Volume 3995, Nondestructive Evaluation of Highways, Utilities, and Pipelines IV; (2000) https://doi.org/10.1117/12.387856
Event: SPIE's 5th Annual International Symposium on Nondestructive Evaluation and Health Monitoring of Aging Infrastructure, 2000, Newport Beach, CA, United States

Abstract

Acoustic emission technique was employed for the monitoring of crack activity in both steel bridge members and laboratory specimen. Laboratory experiment was carried out to identify AE characteristics of fatigue cracks for compact tension specimen. The relationship between a stress intensity factor and AE signals activity as well as conventional AE parameter analysis was discussed. A field test was also conducted on a railway bridge, which contain several fatigue cracks. Crack activities were investigated while in service with strain measurement. From the results, in the laboratory tests, the features of three parameters such as the length of crack growth, the AE energy, and the cumulative AE events, showed the almost same trend in their increase as the number of fatigue cycle increased. From the comparisons of peak amplitude and AE energy with stress intensity factor, it was verified that the higher stress intensity factors generated AE signals with higher peak amplitude and a large number of AE counts. In the field test, real crack propagation signals were captured and the crack activity was verified in two cases.

Citation Download Citation

Dong-Jin Yoon, Juong-Chae Jung, Philip Park, and Seung-Seok Lee "AE characteristic for monitoring of fatigue crack in steel bridge members", Proc. SPIE 3995, Nondestructive Evaluation of Highways, Utilities, and Pipelines IV, (9 June 2000); https://doi.org/10.1117/12.387856

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