The form effect in prolate spheroids of magnetically saturated polycrystalline materials: I

Abstract

The deformation that accompanies a change in the magnetization of a ferromagnetic specimen is partly shape-dependent (the form effect) and partly shape-independent (the magnetostriction). This paper investigates the form effect in prolate spheroids on the basis of the theory that assumes that a non-uniform strain is set up by prescribed surface stresses. An explanation is given of how the strain due to the form effect may be calculated. Numerical results are presented in the companion paper by Birss and Hegarty (II).