摘要
远场涡流技术由于不受集肤效应的限制,其可实现原位检测的优点成为解决大厚度非磁性金属平板的有效途径。在前期研究工作基础上,介绍了新型非磁性平板构件脉冲远场涡流传感器的设计原理,并仿真分析了基于连通磁路传感器对不同走向缺陷及不同厚度平板的检测能力。结果表明:将脉冲远场涡流技术应用至非磁性金属平板检测时,检测信号所受扰动主要是缺陷对感应涡流的扰动,而非缺陷对磁场的扰动,这与其检测铁磁性材料存在根本的区别,同时,其可检测的板材厚度达到了25 mm,研究结果为脉冲远场涡流技术在航空领域的应用提供了有益的探索。
Remote field eddy current （RFEC） technique is not restrict by the skin effect and becomes the top effective method to detect nonmagnetic plate with big thickness. On the basis of former research foundation, the design principle of new pulsed remote field eddy current probe used to detect nonmagnetic plate is introduced, and the performance of detecting different orientation defect and different thickness plate is analyzed. The result shows that response signal is induced by the disturbing of eddy current rather than magnetic with defect when this technique used to detect nonmagnetic material, which has a big difference from detecting ferromagnetic material. At the same time, this technique can be used to detect nonmagnetic plate with 25 mm thickness. This research explores the application of pulsed remote field eddy current using in aviation domain.
出处
《失效分析与预防》
2014年第4期193-197,231,共6页
Failure Analysis and Prevention
基金
国家自然科学基金(51377172
51107149)
航空科学基金(20130996009)
无损检测技术教育部重点实验室开放基金(ZD201229004)
关键词
大厚度非磁性平板
脉冲远场涡流
裂纹缺陷
新型传感器
仿真分析
big thickness nonmagnetic plate
pulsed remote field eddy current
crack
new structure probe
simulation analysis
