MAGNETOMECHANICAL DAMPING AND MECHANICAL BARKHAUSEN EFFECT AS MEASURED FOR NORMAL LOAD MODE

Magnetomechanical hysteresis process was tested using normal mode of l oad. Tensile and compresion load with constant stress rate of 10 MPa s (-1) was applied to the rod-like sample of the St3 low carbon Polish s teel (cross section 40 mm(2)). The intensiy of the mechanical Barkhaus en noise(MBN) was measured during the first tensile load (up to 130 MP a) and during cyclic loading for various amplitudes of stress. The mag netomechanical energy losses (MEL) for one cycle of load was calculate d from the magnetomechanical strain-stress hysteresis loops. There wer e established two features of MBN intensity: 1-linear relation between the integral of the MBN intensity as calculated from the first load e xperiment and the integral of the MBN intensity hysteresis loop for a given stress amplitude and 2 - linear relation between MBN intensity h ysterersis loop integral and the MEL integral for one cycle of load fo r the same stress amplitude. These results makes evident, that the MBN Intensity is proportional to energy loss rate.