Abstract
Detection of fatigue and stress induced hairline surface cracks is an important practical concern in a variety of metallic structures and in particular in steel bridges. There are several conventional nondestructive techniques used for this purpose1. Each of these techniques possesses certain advantages as well as some limitations. Microwave methods have also been used for surface crack detection in metals2. However, their utility have been quite limited thus far. In 1992 a novel microwave approach was introduced employing an open-ended rectangular waveguide for the detection and evaluation of surface cracks in metals3–5. This method has the potential for sizing a crack and determining crack tips very accurately even when the crack is filled with a dielectric material or when it is covered with a thin coating such as paint6–7. There have also been two electromagnetic models developed in conjunction with these efforts1, 8–9.
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Qaddoumi, N. et al. (1998). Analysis of Loading vs. Microwave Fatigue Crack Detection Sensitivity using Open-Ended Waveguides. In: Green, R.E. (eds) Nondestructive Characterization of Materials VIII. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-4847-8_49
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DOI: https://doi.org/10.1007/978-1-4615-4847-8_49
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