An Impedance Measurement Technique for Composite Materials Moisture Level Detection Devoted to Health Monitoring in Aeronautics
An Impedance Measurement Technique for Composite Materials Moisture Level Detection Devoted to Health Monitoring in Aeronautics
复制标题
复合材料湿度检测阻抗测量技术致力于航空健康监测
DOI：
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发表时间：
2019
影响因子：
3.3
通讯作者：
P. Vernillo
中科院分区：
文献类型：
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作者：
R. Sorrentino;L. Di Palma;M. Inverno;P. Vernillo
目前复合材料航空结构的设计实践要求使用可拆卸的结构材料，以考虑到对环境暴露(即潮湿、温度、损坏)的高度敏感性。“湿度降低系数”来自特定的机械测试活动，大大降低了使用这种材料的优势；但持续监测结构的水分含量可以使用更高的设计允许值。在FUSIMCO(在FUSIMCO-FUSoliera Ibrida Metallo Commposito项目框架内开展的工作，由MIUR-意大利研究部共同资助，DAC-Campania航空航天区为受益者，Leonardo公司-航空结构司为“主要”合作伙伴)项目框架内，本研究的目的是验证阻抗测量方法作为评估航空复合材料结构吸湿量的健康监测工具的有效性。该方法基于复合材料层合板可以与等效电路(EEC)相关联的思想。这种EEC的某些电气特性可能与层压板的水分含量有关。使用了一个简单的EEC模型，主要是电容式。频率扫描是一些电极的电刺激信号，粘在试件上，研究EEC参数随诱导水分含量变化的变化(重量法确定)。这项研究证实了有效地使用阻抗测量方法作为评估复合材料层压板水分含量的健康监测工具的可能性。
The current design practice of composite material aeronautical structures imposes the use of knock-down structural material allowables to take into account the high sensitivity to environmental exposure (i.e., moisture, temperature, damages). The “moisture derating factor” comes from specific mechanical test campaign and drastically reduces the advantage of using such materials; but the continuous monitoring of the moisture content of the structure could enable the use of higher design allowables. In the framework of FUSIMCO (Work developed within the frame of the Project FUSIMCO-FUSoliera Ibrida Metallo COmposito-co-financed by MIUR-Italian Ministry of Research with DAC-Campania Aerospace District as beneficiary and Leonardo Company-Aerostructure Division as “prime” partner) project, the aim of this study is to verify the effectiveness of the impedance measurement method as a health-monitoring tool to evaluate the moisture quantity absorbed by an aeronautical composite structure. The method is based on the idea that a composite laminate can be associated with an equivalent electric circuit (EEC). Some electrical characteristics of this EEC can be associated to the moisture content of the laminate. A simple EEC model, mainly capacitive, was used. A frequency sweep was the electric stimulus signal of some electrodes, glued onto the specimens to investigate the EEC parameters variation with respect to the induced moisture content variation (gravimetrically determined). The study confirmed the possibility of effectively using the impedance measurement method as a health-monitoring tool for moisture content evaluation of a composite laminate.