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A platform for research: civil engineering, architecture and urbanism
Empirical modeling of surface crack detection in concrete using an open-ended rectangular waveguide
Microwave nondestructive testing and evaluation of surface-breaking and internal cracks in cement-based materials, employing open-ended rectangular waveguide probes, has the potential to be a viable approach for the purpose of structural health monitoring. This paper presents an empirical model for simulating crack characteristic signal (signal reflected by a cracked sample under test as a function of scanning distance) given the dielectric property of the material, crack dimensions, probe aperture dimensions, operating frequency and the standoff distance. The results of scanning specimens with stress-induced cracks using an open-ended rectangular waveguide probe were discussed. This measurement technique is capable of detecting surface-breaking cracks which are barely visible by human eyes. In an effort to characterize a crack from its crack characteristic signal, this paper presented the results of a developed forward model. The results show that the simulated crack characteristic signals are similar to the measured signals. This empirical model has the potential to accurately simulate crack characteristic signal for a given standoff distance, operating frequency, waveguide dimensions and crack width. More measurements are to be conducted to make the empirical model more robust. A future inverse model is expected to be developed to extract crack dimensions from crack characteristic signal.
Empirical modeling of surface crack detection in concrete using an open-ended rectangular waveguide
Microwave nondestructive testing and evaluation of surface-breaking and internal cracks in cement-based materials, employing open-ended rectangular waveguide probes, has the potential to be a viable approach for the purpose of structural health monitoring. This paper presents an empirical model for simulating crack characteristic signal (signal reflected by a cracked sample under test as a function of scanning distance) given the dielectric property of the material, crack dimensions, probe aperture dimensions, operating frequency and the standoff distance. The results of scanning specimens with stress-induced cracks using an open-ended rectangular waveguide probe were discussed. This measurement technique is capable of detecting surface-breaking cracks which are barely visible by human eyes. In an effort to characterize a crack from its crack characteristic signal, this paper presented the results of a developed forward model. The results show that the simulated crack characteristic signals are similar to the measured signals. This empirical model has the potential to accurately simulate crack characteristic signal for a given standoff distance, operating frequency, waveguide dimensions and crack width. More measurements are to be conducted to make the empirical model more robust. A future inverse model is expected to be developed to extract crack dimensions from crack characteristic signal.
Empirical modeling of surface crack detection in concrete using an open-ended rectangular waveguide
Empirische Modellierung des Nachweises von Oberflächenrissen in Beton mittels rechteckiger Wellenleiter
Nadakuduti, J. (author) / Zoughi, R. (author) / Chen, G. (author)
2005
8 Seiten, 7 Bilder, 10 Quellen
Conference paper
Storage medium
English
| British Library Online Contents | 1997
| British Library Online Contents | 1995
Application of open-ended rectangular waveguides for detecting surface cracks [2456-30]
| British Library Conference Proceedings | 1995