FIELD: nondestructive testing of parts in process of their running. SUBSTANCE: section of surface of part in the form of matrix of local magnetic marks having two unlike poles S and N with definite spacing and period is magnetized. Difference of extreme magnitudes of magnetic field in poles S and N which is amplitude of magnetic field of mark is found. Stresses existed in part are determined by calibration chart and relative change of amplitude of magnetic field after loading in each point. EFFECT: enhanced accuracy and informativity of determination of stress fields in parts and metal structures. 4 dwg
