Correlation between uniaxial ratcheting and magnetic response under cyclic loadings in X80 pipeline steel

Abstract

The objective of this research is to explore the correlation between uniaxial ratcheting behaviour and magnetic response under asymmetrical cyclic stressing in X80 pipeline steel. The magnetic field variations from cycle to cycle were recorded simultaneously during ratcheting. Analysis made in the present work shows that the magnetic hysteresis loop evolves systematically with the number of cycles in terms of its shape and position. The most prominent result here is that the magnetic field under a certain stress first decreases sharply in the preliminary stage of ratcheting, followed by a stable decreasing period with an approximately linear slope. Furthermore, it can be concluded that ratcheting influences the changes in magnetic field more significantly under tensile stress than compressive stress. The underlying reason of the strong non‐linearity of the magnetic field evolution was discussed.

Experimental study on strengthening the magneto-mechanical coupling effect of X80 steel by weak magnetic excitation

“…Liu et al tested three components of the MMM signal, including B x , B y , and B z signals, corresponding to different fatigue cycles [21]. Bao et al studied the correlation between asymmetric cyclic stress and magnetic response of X80 pipeline steel and found that magnetic signals are more sensitive to the response of tensile stress [22]. Besides, He developed the Non-contact pipeline magneticbased stress inspection system based on weak magnetic stress detection technology to detect stress concentration in pipelines [23].…”