The Variation of the Internal Friction and Elastic Constants with Magnetization in Iron. Part II

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Abstract
The experimental method described in Part I of this paper is applied to measure the variation of the rigidity modulus and torsional decrement with magnetization in unannealed and annealed Armco iron. Formulae are derived which evaluate the contributions to the moduli and decrements arising from eddy currents induced in the vibrating specimen by the change in magnetization produced by the varying stress. These formulae contain the magnetostriction and Wiedemann effect coefficients, which, accordingly, have been measured. All effects of the eddy currents are thus eliminated from the final data, which are discussed in the light of recent ferromagnetic theory.

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