Effect of previous plastic strain on the magnetic behavior of metal in different zones of a welded large-diameter pipe under elastic uniaxial tension (compression)

Non-destructive monitoring of tensile of mild steel samples by magnetic Barkhausen and ultrasonic methods

“…Many research papers concerning the stress effect on non-destructive testing parameters reveal results due to different materials and microstructure as well as NDT parameters [1-10, 11, 12, 15, 16, 33, 34]. The most used methods for stress (residual and applied stress) and structure evaluation are magnetic [1,2,15,16,22,24,35], magnetic Barkhausen Noise (MBN) [18][19][20][21][22][23][24][25], magneto acoustic emission (acoustic Barkhausen noise) (MAE) [9,11,12,13,14] and ultrasonic methods [4, 5, 26-29, 30, 31]. The first two methods and effects are due to abrupt movement of magnetic domain walls during the magnetization of samples.…”