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Open AccessArticle

Internal Stress Monitoring of In-Service Structural Steel Members with Ultrasonic Method

by Zuohua Li 1,2, Jingbo He 1,2, Jun Teng 1,2,* and Ying Wang 3,*
1
School of Civil and Environment Engineering, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China
2
IoT Application Technology Center of NDT, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China
3
Department of Civil and Environmental Engineering, University of Surrey, Guildford GU2 7XH, UK
*
Authors to whom correspondence should be addressed.
Academic Editor: Jung Ho Je
Materials 2016, 9(4), 223; https://doi.org/10.3390/ma9040223
Received: 29 January 2016 / Revised: 11 March 2016 / Accepted: 17 March 2016 / Published: 23 March 2016
(This article belongs to the Section Structure Analysis and Characterization)
Internal stress in structural steel members is an important parameter for steel structures in their design, construction, and service stages. However, it is hard to measure via traditional approaches. Among the existing non-destructive testing (NDT) methods, the ultrasonic method has received the most research attention. Longitudinal critically refracted (Lcr) waves, which propagate parallel to the surface of the material within an effective depth, have shown great potential as an effective stress measurement approach. This paper presents a systematic non-destructive evaluation method to determine the internal stress in in-service structural steel members using Lcr waves. Based on theory of acoustoelasticity, a stress evaluation formula is derived. Factor of stress to acoustic time difference is used to describe the relationship between stress and measurable acoustic results. A testing facility is developed and used to demonstrate the performance of the proposed method. Two steel members are measured by using the proposed method and the traditional strain gauge method for verification. Parametric studies are performed on three steel members and the aluminum plate to investigate the factors that influence the testing results. The results show that the proposed method is effective and accurate for determining stress in in-service structural steel members. View Full-Text
Keywords: ultrasonic method; longitudinal critically refracted waves; in-service structural steel members; internal stress; acoustoelasticity ultrasonic method; longitudinal critically refracted waves; in-service structural steel members; internal stress; acoustoelasticity
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Li, Z.; He, J.; Teng, J.; Wang, Y. Internal Stress Monitoring of In-Service Structural Steel Members with Ultrasonic Method. Materials 2016, 9, 223.

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