Effect of biaxial stress, on magnetoacoustic emission from nickel

Magnetoacoustic emission (MAE) measurements have been made on a cross-shaped nickel plate subjected to biaxial tensile and compressive stresses (or strains) in a magnetizing field applied parallel to one of the axes. The results indicate that MAE generally decreases with increasing compressive stress (σ_x) normal to the direction of the applied field (H_y) irrespective of the sign of the stress (σ_y) parallel to the field. However, when σ_y tensile, this decrease in the MAE is more rapid than with compressive σ_y. It is found that MAE varies more markedly when presented as a function of stress rather than of strain