It is found that the MMM signal 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。
Metal magnetic memory technology (MMMT) is new nondestructive testing (NDT) method that can detect the hidden damage in ferromagnetic component early and avoid component-tired damage happen abruptly.
金属磁记忆检测技术是对铁磁设备部件隐性损伤进行早期诊断，防止部件突发性疲劳破损的一种无损检测新技术。
In school education, people give more concern on visible injury on campus than the hidden damage that is invisible, intangible and implicit.
在学校教育中，人们对校园伤害的关注大多集中在显性伤害，而有一种看不见的、无形的、内隐的隐性伤害却重视不够。
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