Research on Yield Strength Estimation and Lift-off Suppression Method Based on Incremental Permeability Features

The incremental permeability (IP) is related to the reversible domain-wall motion of ferromagnetic materials during the period of dynamic magnetization. IP feature ? can be used to estimate the yield strength of materials. However, the IP signal generated by reversible domain-wall motion is weak. During the experiment, the vibration of the platform and the uneven surface of the sample will change the lift-off conditions of the probe, resulting in the distortion of the IP signal. In order to solve this problem, in this paper, a two-parameter fitting method is proposed to optimize the estimation of yield strength by ?. Two compensation parameters a(?) and b(?) related to lift-off are proposed to modify the ? curve, making it possible to detect the material under different lift-off conditions. Finally, the yield strength of the material is estimated under different lift-off conditions, and the estimation error is less than 10%.