Condition monitoring of carbon steel piping using Barkhausen noise measurement
Various industrial process plants, including nuclear reactors, use carbon steel piping in their fluid and heat transport circuit. Fatigue-related changes in the material characteristics which appear in a period before and during the crack initiation and stress-related changes due to loading can be non-destructively quantified with the micromagnetic testing method known as Magnetic Barkhausen Noise (MBN) measurement. Investigations were carried out for studying: (i) the fatigue crack growth on a cyclically loaded notched piping; and (ii) the stress distribution pattern under in-plane bending test on a carbon steel seamless pipe butt welding elbow specimen of a 90° long radius. The progressive changes in MBN were observed during fatigue test both before crack initiation and during crack growth. Elbows underwent geometric distortion during in-plane bending and Barkhausen noise was found to change in the extradosintrados as well as flank-flank zone. It is therefore suggested that the technique can be used in monitoring fatigue damage under service and stress distribution on ferromagnetic piping components.
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Document Type: Research Article
Publication date: October 1, 2003
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- Official Journal of The British Institute of Non-Destructive Testing - includes original research and devlopment papers, technical and scientific reviews and case studies in the fields of NDT and CM.
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