In order to evaluate the residual fatigue life of end-of-life crankshaft, this paper proposed a new testing method based on eddy current and magnetic memory method.
为了对退役曲轴再制造前的剩余疲劳寿命进行评估，提出了一种基于涡流和磁记忆法的退役曲轴检测方法。
2
The method of metal magnetic memory is a new potential nondestructive testing method, which can be used to detect and estimate the residual stress and micro-damages of the ferromagnetic items.
利用磁记忆效应对铁磁性金属构件的残余应力和微损伤进行检测和评估，是较有潜力的无损检测新方法。
3
A measuring method combining main magnetic flux and magnetic flux leakage for approaching the residual wall thickness of the oil well tubing in-service was presented.