Abstract
Semisinusoidal loads with constant amplitude or increasing amplitude were applied on steel specimens separately in earth magnetic field. The testing results indicated that t he variation degree of the magnetic signals was mostly determined by the amplitude of the applied loads. With the load amplitude increasing to plastic loading stage, zero-crossing of the Hp(y) distribution curve occurred and stayed at certain position where the curve has large gradient. The zero-crossing position was exactly the necking point and unchangeable after unloading, which suggested that the plastic failures and microdefect s can be identified through testing the Hp(y) signals.
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