Irreversible Magnetization Components Research Articles

Magnetization changes induced by stress under constant applied field in 2% Mn pipeline steel

Reversible and irreversible magnetization components have been derived from cyclic stress applied to initial magnetization curves at different magnetization levels and for different stress cycle amplitudes. The irreversible and reversible magnetization components derived were found to vary symmetrically and antisymmetrically with the applied stress, respectively. The variation of the irreversible magnetization component with applied compressive and tensile stresses was found to be in qualitative agreement with the extended Brown's theory of L. Brugel and A. Rimet (1965, 1966).< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

A new approach to Preisach diagrams

Magnetization processes are complex. A simple Preisach diagram can describe only the irreversible component of magnetization. An extended Preisach model is introduced, including a reversible magnetization component given by a Langevin function which describes low-field experimental hysteresis loops very well. A family of anhysteretic curves are shown that are dependent on the amplitude and form of the ac used to generate them and the turning points on the M-H plane.

Effect of stress on magnetization and magnetostriction in pipeline steel

Measurements of the effects of stress on the initial magnetization curve of a sample of 1 % Mn pipe line steel and on its reversible component are presented. Stress-induced changes in the reversible and irreversible magnetization components are shown. Examples of magnetization changes induced by tensile and compressive stress cycles of various amplitudes and at different fields are given. Magnetostriction measurements made on the same sample under various tensile and compressive stresses measured along anhysteretic and initial magnetization curves are included. A simple interpretation is suggested based on the assumption that stress changes the alignments of magnetic domain easy axes with respect to the strain.