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1 August 2003 A simple approach to the localization of flaws in large diameter steel cables
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Experimental work performed on several full-scale stay-cable models as well as on RAMA IX Bridge in Bangkok has confirmed that the application of magnetic flux leakage (MFL) methods is a viable approach to the non-destructive evaluation of large diameter steel cables. Such method allows for a high sensitivity and high-resolution detection of fractured wires in stay cable systems. So far, the information obtained from the recorded data (intensity of the MFL on the surface of a cable) was limited to the accurate position of detected flaws along the axis of the cable and a qualitative indication of the position of the flaws within the cross-section. The ability to accurately determine the position of flawed wires within the cross-section of a cable is especially useful in the case of multi-strand systems, in which individual strands can be replaced if damaged. Such information can be obtained by computation with finite element models or sophisticated dipole approximations. An alternative to such computing intensive approach, based on a simple mathematical model of the MFL function is proposed in this work. The function is used for a non-linear fit of the measured data. The method has been tested successfully on simulated and measured data.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Andrea Bergamini and Rouven Christen "A simple approach to the localization of flaws in large diameter steel cables", Proc. SPIE 5047, Smart Nondestructive Evaluation and Health Monitoring of Structural and Biological Systems II, (1 August 2003);

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