摘要
碳纤维复合材料(CFRP)近年来被广泛应用于航空航天领域,实现其结构完整性检测对于航空航天安全至关重要。基于CFRP层合板的各向异性电学特性,提出利用平面电容传感器实现其结构性损伤检测,该方法具有成本低、非侵入、无辐射、操作简单等优点。比较分析了4种不同形状的平面式电容传感器,通过COMSOL软件构建CFRP层合板的3种典型损伤模型,从信号强度、灵敏度、信噪比、测量动态范围和相关系数等指标分析比较4种电容传感器。同时,结合实际测量数据,比较了CFRP表面损伤半径分别为5、2和1 mm时4种传感器的检测性能。结果表明,三角形传感器在相关系数指标上相比于其他传感器有至少9.8%的检测精度提升,能够有效检测和识别CFRP层合板的缺陷。
Recently, carbon fiber composite material(CFRP) is widely used in the aerospace field. The test of its structural integrity is vital to aerospace safety. Based on the anisotropic electrical characteristics of CFRP laminates, a planar capacitive sensor is designed to achieve structure damage detection. This method has advantages of low cost, non-invasiveness, non-radiation, and simple operation. In this paper, four different types of planar capacitive sensors are compared and analyzed. Three typical damage models of CFRP laminates are constructed by the COMSOL software. Four capacitive sensors are analyzed and compared from the indicators of signal strength, sensitivity, signal-to-noise ratio, measurement dynamic range and correlation coefficient. Meanwhile, combined with the actual measurement data, the detection performance of four sensors is compared when the CFRP surface damage radius is 5 mm, 2 mm and 1 mm, respectively. Compared with other sensors in the correlation coefficient index, results show that the triangle sensor has the detection accuracy improvement at least 9.8%, which can effectively detect and identify defects in CFRP laminates.
作者
范文茹
董永智
Fan Wenru;Dong Yongzhi(College of Electronic Information and Automation,Civil Aviation University of China,Tianjin 300300,China)
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2020年第7期63-71,共9页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金(61871379)项目资助
