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<p>The object of the investigation was to establish a quantitative relationship between stress and magnetic properties. Using high magnetic fields and the relationship  rho  =  alpha + beta H where  rho  = metallic reluctivity and  alpha  and  beta  characteristic constants for the material, ballistic observations were made on steel wire over the region H = 100 to 800 and tensions from 0-102,000 lbs./sq. in. It is found that tension causes a departure from the linear relationship. The reluctivity curve for non- homogeneous material is the resultant of two or more straight lines expressing the magnetic properties of the components. Within the proportional' limit there is approximately a linear relationship between the applied stress and the intercept on the  rho  axis of the asymptote of the reluctivity curve.
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<br>Subjects:</div>
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Sanford, R.L.</div>
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