It is found that the MMM sig-nal has apparent relationship with the damage,and that by the zero value of the MMM signal,the hidden damage in the ferromagnetic component can be detected.

• 通过试验发现,磁记忆检测信号与构件的损伤状态之间具有明显的相关性,通过检测法向磁场的过零点可以实现对构件早期损伤的检测。