关键词: 无损检测, 金属磁记忆检测, 力磁耦合, 磁化状态, 无滞后磁化强度

Abstract: The influences of magnetization state on magnetomechanical coupling relationship were analyzed both at the micro level and at the macro level. From the microscopic perspective, under different magnetization states, the changing rules were analyzed,that the domain structure of ferromagnetic components was subjected to applied stresses was analyzed. From the macroscopic perspective, based on approaching principle, the process which a applied stress made the initial magnetization state approached nonhysteresis magnetization state constantly was explained, where the closed direction is determined by the sizes of differences between nonhysteresis magnetization and initial magnetization. If the differences are greater than zero, the magnetization will increase with stress increasing, and if the differences is less than zero, the situation is versa, but nonhysteresis magnetization will change momently with the changes of stresses. Finally, in order to further verify theoretical analysis experimentally, a static load tensile test was applied to Q235 steel with three different magnetization states, the experimental results are consistent with theoretical analyses.

Key words: nondestructive testing, metal magnetic memory testing, magnetomechanical coupling, magnetization state, nonhysteresis magnetization