Thesis
Ultrasonic characterization of ASTM A307 bolts
Washington State University
Master of Science (MS), Washington State University
2008
Handle:
https://hdl.handle.net/2376/100716
Abstract
Steel bolts are commonly used in timber and steel connections. Since the failure of the whole structure may result from a connection failure, it is important to find a methodology for testing these bolts in place without causing any destruction to the structure. In this study 290 ASTM A307, Grade A, standard bolts ("Standard Specification" 2003) were inspected ultrasonically to assess the characteristics of the ultrasonic signals. These characteristics will be the baseline for future analyses of ultrasonic signals from defective or damaged bolts either in timber or steel structures. The three ultrasonic signal parameters analyzed included the peak frequencies of the first back echo and associated first and second trailing echoes, the centroid of the first back echo and associated first and second trailing echoes, and the ratios of peak amplitudes for the first and second trailing echoes to the peak amplitude of the first back echo. The most effective ultrasonic signal parameter to characterize the bolts was the centroid of the first back echo and associated trailing echoes, because it had the lowest coefficient of variation among all the parameters investigated. The second best parameter was the ratio of peak amplitudes of the trailing echoes to the first back echo. The parameter with the highest coefficient of variation was the peak frequency of the individual echoes.
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Details
- Title
- Ultrasonic characterization of ASTM A307 bolts
- Creators
- Seren I. Abulail
- Contributors
- David Garnet Pollock (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525151001842
- Language
- English
- Resource Type
- Thesis