摘要
金属磁记忆检测技术是一种能对铁磁构件早期损伤进行有效诊断的无损检测技术。为进一步探索研究金属磁记忆检测的机理,选用粉纹法对Q235平板试样的磁畴结构进行观察,研究地磁场中不同应力状态下该铁磁材料的磁畴结构的变化特征,并且利用高精度弱磁检测装置获取其试件表面的漏磁信号规律。试验结果表明:随外载荷的改变,被观察部位的磁畴类型、畴壁形态有显著性变化,且不同区域的磁畴转变快慢不同但变化趋势相近;同时,随外载荷的增大,试件表面漏磁信号增大。验证了地磁场中铁磁材料的磁畴结构受应力作用发生磁畴移动与转向,并且在应力撤出后这种改变得以保留的规律。为铁磁材料磁记忆检测微观机理的进一步探索研究提供可靠、有效的试验依据。
Metal magnetic memory testing technology is an effective way of the non-destructive testing techniques for early damage diagnosis of ferromagnetic materials. To further explore the mechanism of metal magnetic memory testing, the magnetic domain structure of Q235 tablet samples are observed by bitter pattern, the characteristics changes of magnetic domain structure under the different stress states in earth magnetic are researched, and the high-precision weak magnetic detection devices are used to obtain the magnetic flux leakage signal of the specimen surface. The results show that the magnetic domain types and domain wall morphology change significantly with the change of external loads; and different regions have different change speed of magnetic domain, but they have a similar trend; the same time, the magnetic flux leakage signal of specimen surface increases with the external loads increases. The magnetic domain of ferromagnetic materials move by stress and preserve such changes after the withdrawal of the stress in earth magnetic are verified. Thus it provides reliable and effective experimental basis for further study of the microscopic mechanism of ferromagnetic materials magnetic memory testing.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2013年第2期8-13,共6页
Journal of Mechanical Engineering
基金
国家自然科学基金(51065022)
无损检测技术教育部重点实验室开放基金(ZD200929006)资助项目
关键词
磁记忆检测
粉纹法
不同应力状态
磁畴结构
漏磁信号
Magnetic memory testing Bitter pattern Different stress states Magnetic domain structureMagnetic flux leakage signal
