Some recent aspects of torsional magnetoelastic effects

On the basis of the Matteucci effect, the principal magnetoelastic aspects found by the authors and others in bars and wires of ferromagnetic materials subject to torsion in the limits and beyond Hooke´s law is discussed. In particular, the experimental relations between torsion angle (or stresses) and electric signals due to torsional magnetization are described. Some possible applications of the exposed results are suggested: 1) from the peak voltage of the Matteucci signal both internal stresses and their axial location may be deduced ; 2) the field of applied stresses being known, the magnetization state induced by the stresses may be obtained from graphic or electronic intergration of the electrical signal which, in turn, can yield some information on the magnetoelastic parameters of the sample.