Abstract:

By testing the magnetic flux leakage distributions of specimens of steel 20 under uniaxial tensile loading condition and after removal of the applied uniaxial tensile load, at different loading levels, the influence of stress state on magnetic signal was studied. At the stress concentration zone, the magnetic signal change is found relatively gentle with slight deformation of the specimen, relatively acute with a certain plastic deformation of the specimen and very acute when necking of specimen happens.

Key words: nondestructive , testing,  , stress , state,  , magnetic , memory , testing,  , magneto-elastic , effect,  , micro-damage