Electromagnetic Pulse Shielding Using Construction Steel

The limiting nonlinear analysis of Sixtus and Tonks is extended to the prediction of the shielding effectiveness of construction steels subjected to electromagnetic pulses. The magnetization curve is approximated by N steps in which magnetic induction or intensity varies but both never vary simultaneously. This method is applied to cylindrical magnetic shields. When applied magnetic intensity exceeds a certain value, a corresponding value of magnetic induction is imagined to form at the surface and propagates inward. As the applied field is increased, successive regions of corresponding magnetization propagate. By the use of Maxwell´s curl equations, N simultaneous nonlinear first order differential equations are established and solved to yield the transient distribution of magnetic induction and electrical field intensity.