关键词: 激励磁场, 力磁耦合, 强化, 金属磁记忆

Abstract: The stress-magnetization coupling effect was the basis of metal magnetic memory detection and other electromagnetic nondestructive testing technology.To investigate the mechanism of the excitation magnetic field to stress-magnetization coupling effect under different stress levels， a differential value ΔH， was calculated theoretically from the relationship of permeability and stress and environmental magnetic field， which was the difference between the magnetic field strength affected by stress or magnetism interactively and by them individually.It was deduced that ΔH increased with the increases of tensile stresses.A control test was conducted with a prefabricated defective 45 steel sample， and it is found that ΔH， characterized the effects of the excitation magnetic field on the stress-magnetization coupling， increases exponentially with the increases of the stresses.And the orthogonal experiment was designed to verify that the interactions between the excitation magnetic field and the stress on the magnetic signals were significant.In the loading processes， the excitation magnetic fields were the greatest impacts on the signals.These are consistent with the theoretical analyses.The results show that excitation magnetic field plays a certain role in strengthening the stress-magnetization coupling effects.

Key words: excitation magnetic field, stress-magnetization coupling, strengthening, metal magnetic memory