磁法检测技术在应力检测中的研究

Research of Magnetic Detection Technology in Stress Testing

磁法检测技术是通过对试件磁信号的检测,对试件的压力集中情况和疲劳损伤程度进行早期评估的一种新的检测手段。该方法的使用可以正确反映待测试件应力的变化。为了精确测量试件的磁信号强度,在研制了高灵敏度磁矢量探头检测的试验平台的同时,建立了检测信号与磁导率的关系算法。试验发现,应力集中区域,会导致该区域与周边的区域磁导率发生相应的差异,即随着试件中所存在的残余应力增加,所采集得到的磁信号强度也在增大。

Magnetic is a technique by which can evaluate stress concentration and degree of fatigue damage by testing the per-meability of ferromagnetic components. The technique can reflect the stress changes in component precisely. In order to measure the permeability accurately, the high sensitivity testing platform and the algorithm between the signal and the permeability are set-up. The results demonstrate that the permeability and micro-strain of the material increase with the residual stress.