DETERMINATION OF THE DENSITY OF MAGNETIC SHEET STEEL USING STRIP AND SHEET SPECIMENS

Knowledge of the thickness of magnetic sheet steel is required for set ting the induction during measurements of the magnetic properties. Dir ect measurements are difficult, so that the thickness is derived from the density rho(m). For the density, in turn, the immersion method is a direct but difficult and uncertain method of determination. However, relying on a well known density to resistivity relation, the electric al measurement is a convenient alternative. It is shown that a simple method based on conformal mapping theory provides a reliable method of determining the resistivity, and thus the density, even for large she et specimens.