Determining stress in ferromagnetic materials from measurements of magnetic anisotropy and magnetic permeability
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Oct 27, 1998
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Nov 16, 1995
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May 21, 1993
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Abstract
The absolute values of biaxial stresses in a ferromagnetic material (16) are measured using a probe (12) which comprises an electromagnet (26), a sensor (32) for stress-induced magnetic anisotropy (SMA) and a sensor (30) for directional effective permeability (DEP). The DEP sensor (30) enables absolute values of stress to be determined; the SMA sensor (32) enables the directions of the principal stress axes to be accurately determined, and improves the accuracy of the stress measurements.
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