Abstract: In measuring mechanical stresses in an object of hardened and tempered steel with a magnetic transducer of the type which comprises a magnetizing circuit for generating a magnetic field in the object and a measuring circuit for sensing the changes in the magnetic field which occur in the object when it is subjected to mechanical forces, in order to reduce the creep of the measuring signal which occurs in the case of continuous feeding, the magnetizing circuit is energize with energy in the form of AC pulses of a pulse length between 20 and 120 milliseconds.

Abstract: A magnetoelastic shear force measuring means for measuring shear stresses in tubular axles, preferably in aircraft landing gear axles, comprises two shear stress transducers. Each transducer has one iron core with winding to generate a magnetic field in the measuring object and a second iron core with winding to sense the field alterations generated in the measuring object by shear stresses. The two transducers are combined to form a measuring unit which is inserted in the tubular axle. The windings on the cores of the transducers are connected in such a way that the shear signals are added and signals from any torsion occurring are subtracted from each other.