DYNAMIC METHODS OF EVALUATING THE MECHANICAL-PROPERTIES OF MATERIALS USING THE VILLARI EFFECT

The new method discussed here for recording the collision of a rigid r od made of a highly magnetostrictive material is based on measuring th e variations of its magnetization. Analytical relations given establis h a link between the emf in an induction coil firmly attached to the r od and the mechanical stresses in the rod. Equations that define hardn ess as the average contact pressure are obtained on the basis of the s olution of the problem of the collision of a rod having a hemispherica l end with an elastoplastic half-space. The results of experimental in vestigations are reported.