Journal issues: 5/2013
1 September, 2013
Nondestructive evaluation of pipelines: magnetoacoustic diagnostics of deformation
The quintessential feature of the metal overload and its reaching to the ultimate strength is a plastic deformation. Great attention is paid to the search for effective methods of non-destructive testing of stress levels and strains in the materials of oil and gas pipelines. Among the NDT methods that are embedded in the oil and gas transportation industry, significant attention is given to the acoustic emission (AE ) – a method that has proved effective in detecting not only brittle fracture, but the plastic shear strain at fracture of plastic materials . However, the AE method is considered effective only when diagnosed object is subjected to stresses exceeding the normal operating levels (Kaiser effect) .The effect of elastic and plastic deformation of mild steel on the intensity of magnetoacoustic emission (MAE) have been studied with a measuring MAE system that has been engineered at Karpenko Physical-Mechanical Institute of the National Academy of Sciences of Ukraine. Studies using this system NDT were the primary objective of this work, which according to the parameters analyzed for the MAE signals from elastic and plastic deformation of commercial carbon steel. The principle of operation is based on the MAE non-antiparallel dynamics of domain walls. The observed trends in decreasing the MAE signal intensity with deformation confirm information known from the literature. The conducted measurements for the elastic straining were highly reproducible with high sensitivity of MAE signal parameters to elastic straining. Studies in the plastic region exhibited relatively lower repeatability and sensitivity of the MAE parameter to the level of plastic deformation. The presented results have demonstrated that MAE could be a perspective method for nondestructive evaluation of plastically damaged parts of operated pipelines, but further studies are needed in order to discriminate the difference between the safe elastic deformation and the dangerous plastic one using MAE signals.
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ageing; elastic deformation; magnetoacoustic emission; mild steel; nondestructive evaluation; pipeline transport; plastic deformation; деформация; магнетоакустическая эмиссия; неразрушающий контроль; старение; трубопроводный транспорт; углеродистая сталь References to this article (GOST) V.R. Skalsky, S.I. Hirnyj, R.N. Basarab Nondestructive evaluation of pipelines: magnetoacoustic diagnostics of deformation // Electronic scientific journal "Oil and Gas Business". 2013. №5. P.301-313. URL: http://ogbus.ru/eng/authors/SkalskyVR/SkalskyVR_1.pdf