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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >NONDESTRUCTIVE EVALUATION OF FATIGUE DAMAGE USING MAGNETIC MEASUREMENT TECHNIQUES
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NONDESTRUCTIVE EVALUATION OF FATIGUE DAMAGE USING MAGNETIC MEASUREMENT TECHNIQUES

机译：使用磁测量技术的疲劳损伤的非破坏性评估

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摘要

The results of this study have demonstrated that magnetic measurement techniques are viable NDE methods for evaluating fatigue damage in steel components. A significant decrease in the magnetic properties such as coercivity, remanence and initial permeability observed in the final stages of fatigue indicates that the measurements of these parameters are promising methods for predicting impending failure. In the stable fatigue stage it was found that coercivity increased slightly while initial permeability decreased. These changes can be attributed to increasing impedance to domain wall motion due to the accumulation of fatigue damage in the surface layer. In this stage it was also found that initial permeability was more sensitive to fatigue cycling than coercivity and remanence. The present results therefore indicate that the measurement of initial permeability can be developed as a viable NDE technique to estimate the remaining fatigue lifetime and hence to monitor fatigue damage throughout the whole fatigue life of steel components.
机译：这项研究的结果表明，磁测量技术是评估钢部件疲劳损伤的可行的无损检测方法。在疲劳的最后阶段观察到的磁性能（例如矫顽力，剩磁和初始磁导率）的显着降低表明，这些参数的测量是预测即将发生的故障的有希望的方法。在稳定的疲劳阶段，发现矫顽力略有增加，而初始磁导率却降低了。这些变化可归因于由于表面层中疲劳损伤的积累而导致的对畴壁运动的阻抗增加。在此阶段，还发现初始磁导率比矫顽力和剩磁对疲劳循环更敏感。因此，目前的结果表明，初始磁导率的测量可以作为一种可行的NDE技术发展起来，以估算剩余的疲劳寿命，从而在钢部件的整个疲劳寿命中监控疲劳损伤。

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