Department of Materials Science and Engineering, University of Sheffield, Sheffield S1 3JD, UK.
Sensors (Basel). 2020 Jan 28;20(3):711. doi: 10.3390/s20030711.
Carbon Fibre Reinforced Polymer composite (CFRP) is widely used in the aerospace industry, but is prone to delamination, which is a major causes of failure. Structural Health Monitoring (SHM) systems need to be developed to determine the damage occurring within it. Our motivation is to design cost-effective new sensors and a data acquisition system for magnetostrictive structural health monitoring of aerospace composites using a simple RLC circuit. The developed system is tested on magnetostrictive FeSiB and CoSiB actuator ribbons using a bending rig. Our results show detectable sensitivity of inductors as low as 0.6 μH for a bending rig radii between 600 to 300 mm (equivalent to 0.8 to 1.7 mStrain), which show a strain sensitivity resolution of 0.01 μStrain (surface area: 36 mm). This value is at the detectability limit of our fabricated system. The best resolution (1.86 μStrain) was obtained from a 70-turn copper (64 μH) wire inductor (surface area: ~400 mm) that was paired with a FeSiB actuator.
碳纤维增强聚合物复合材料（CFRP）广泛应用于航空航天工业，但容易分层，这是失效的主要原因。需要开发结构健康监测（SHM）系统来确定其内部发生的损坏。我们的动机是设计经济高效的新传感器和数据采集系统，用于使用简单的 RLC 电路对航空航天复合材料进行磁致伸缩结构健康监测。所开发的系统在弯曲装置上使用磁致伸缩 FeSiB 和 CoSiB 致动器带进行了测试。我们的结果表明，对于弯曲半径为 600 至 300 毫米（相当于 0.8 至 1.7 mStrain）的感应器，感应值低至 0.6 μH 具有可检测的灵敏度，这表明应变灵敏度分辨率为 0.01 μStrain（表面积：36 mm）。该值处于我们制造系统的可检测极限。从与 FeSiB 致动器配对的 70 匝铜（64 μH）线感应器（表面积：~400 mm）获得最佳分辨率（1.86 μStrain）。
