Research on quantitative characterization method of tensile and compressive stress based on incremental magnetic permeability principle

Abstract In this study, non-destructive quantitative characterization of stresses in low, medium, and high carbon steels was carried out based on the principle of incremental permeability (IP) detection. First, a special fixture was designed and constructed to perform calibration experiments on a single flat plate tensile specimen to obtain the incremental magnetic permeability signals at different compressive and tensile stress levels. Subsequently, the relationship between the magnetic parameter and the stress characterization was analyzed. Finally, a network model was established to realize the quantitative characterization of tensile and compressive stresses in low, medium, and high carbon steels using the magnetic parameter. The results show that the incremental magnetic permeability detection technique can effectively predict the carbon steel stresses non-destructively and quantitatively, and the average relative errors of the model predicted low, medium, and high carbon steel stresses are 1.60 MPa, 1.28 MPa, and 2.54 MPa, respectively. The methods and conclusions proposed in this study provide important references for non-destructive testing of carbon steel stresses.