Circumferential magnetic Barkhausen noise distribution and plane stress measurement

Abstract

Magnetic Barkhausen noise is sensitive to stress, which is an in-situ non-destructive stress measurement technology with convenient operation, high detection sensitivity and good repeatability. It has broad application prospect in residual stress measurement, stress concentration zone evaluation of parts and bearing stress evaluation of structures. The measurement of the maximum principal stress and its direction during the measurement of the plane stress on the surface of ferromagnetic materials in engineering is an urgent problem to be solved. Proposes a plane stress measurement method based on the circumferential magnetic Barkhausen noise distribution, and establishes the solution of the plane stress tensor. The model realizes the demodulation of normal stress and shear stress in any direction of the measuring point. Experiments have verified the effectiveness of this method. Measurement results show that when the principal stress is greater than 50 MPa, the measured maximum principal stress direction deviation is 10°, the maximum normal stress deviation is 5 MPa and the maximum shear stress deviation is 6 MPa, which has high measurement accuracy.