The method of the magneto-optical non-destructive testing to evaluate fatigue strength
A system was developed for monitoring the phase transformation of dual phase steels exposed to cyclic bending loads. Experimentally investigated the effect of rotation of the plane of polarized light in presence of a magnetic field by means of a thin film of yttrium iron garnet. It is shown that by using this film, magneto optical system is capable of detecting defects of steel used in the bodywork. The dependence between the number of cycles of deformation of the material and the output of designed setup was established.