结构键合薄而灵活的线圈的裂纹扩展监测。

Crack Growth Monitoring with Structure-Bonded Thin and Flexible Coils.

机构信息

Aerospace Research Centre, National Research Council Canada, 1200 Montreal Rd., Ottawa, ON K1A 0R6, Canada.

出版信息

Sensors (Basel). 2022 Dec 17;22(24):9958. doi: 10.3390/s22249958.

DOI:10.3390/s22249958

PMID:36560331

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9783821/

Abstract

Structural health monitoring with thin and flexible eddy-current coils is proposed for in situ detection and monitoring of fatigue cracks in metallic aircraft structures, providing a promising means of crack sizing. This approach is seen as an efficient replacement to periodic inspections, as it brings economic and safety benefits. As such, printed-circuit-board eddy-current coils are viable for in situ crack monitoring for multi-layer, electrically conductive structures. They are minimally invasive and could be attached to or embedded into the evaluated structure. This work focuses on the monitoring of fatigue crack growth from a fastener hole with structure-bonded, thin, and flexible spiral coils. Numerical simulations were used for optimization of the driving frequency and selection of crack-sensitive coil parameters. The article also demonstrates the fatigue crack detection capabilities using spiral coils attached to a 7075-T6 aluminum coupon.

摘要

提出了使用薄而灵活的电涡流线圈进行结构健康监测，以原位检测和监测金属飞机结构中的疲劳裂纹，为裂纹尺寸测量提供了一种有前途的方法。这种方法被视为定期检查的有效替代方法，因为它带来了经济和安全效益。因此，印刷电路板电涡流线圈可用于多层导电结构的原位裂纹监测。它们的侵入性很小，可以附着在被评估的结构上或嵌入其中。这项工作侧重于使用结构结合的薄而灵活的螺旋线圈监测紧固件孔处的疲劳裂纹扩展。数值模拟用于优化驱动频率和选择对裂纹敏感的线圈参数。本文还展示了使用附接到 7075-T6 铝合金试件上的螺旋线圈进行疲劳裂纹检测的能力。