Stress evaluation of steel plates by chaos of Barkhausen noise

Summary form only given. We present the stress evaluation of steel plates by chaos of Barkhausen noise. The fatigue and degradation of magnetic materials affect the magnetic domain, so these can be evaluated by the Barkhausen noise. We need a special evaluation method to use it industrially because the Barkhausen noise is a very complicated wave. The quantitative change of the Barkhausen noise after the bending stress test can be found by the correlation dimension of the chaotic attractors constructed by the measured Barkhausen noise. We find that chaotic characteristic of the Barkhausen noise changed before the breakdown of the plate. We can thus determine when the steel plates will break using our proposed evaluation method.