摘要
冲击损伤对复合材料结构安全运行有重要影响,亟需发展结构健康监测技术来及时发现冲击损伤。提出制备碳纳米纤维薄膜的方法,并共固化在复合材料层板表层,通过电阻层析成像技术重建冲击损伤引起的表层电导率变化分布图像对冲击损伤进行监测和识别。分别采用了Tikhonov正则化(吉洪诺夫正则化)和SpaRSA(可分离近似稀疏重建算法)稀疏正则化方法来重建损伤图像。对复合材料层板进行了冲击试验和损伤识别试验,结果表明:电阻层析成像与碳纳米纤维薄膜相结合对冲击损伤识别是有效的;Tikhonov正则化和SpaRSA稀疏正则化方法都能对损伤引起的碳纳米纤维薄膜层的电导率变化进行重建,两者在损伤中心位置的识别方面差别较小,但在损伤尺寸的识别方面都有一定不足,通过图像融合将两者的识别结果进行整合,可以提高损伤识别的准确度。
Impact damage has a significant impact on the safe operation of composite structures,and there is an urgent need to develop structural health monitoring technology to detect impact damage in a timely manner.This paper proposes a method for preparing carbon nanofiber films and co-curing them on the surface of composite laminates.The distribution image of surface conductivity changes caused by impact damage is reconstructed using electrical resistance tomography technology to monitor and identify impact damage.Tikhonov regularization and SpaRSA sparse regularization methods were respectively used to reconstruct the damage image.Impact tests and damage identification tests were conducted on composite laminates,and the results have showed that the combination of electrical resistance tomography and carbon nanofiber film is effective for impact damage identification;both Tikhonov regularization and SpaRSA sparse regularization methods can reconstruct the electrical conductivity changes of carbon nanofiber film layers caused by damage.The difference between the two methods in identifying the location of the damage center is small,but both methods have certain shortcomings in identifying the size of the damage.Integrating the identification results of the two methods through image fusion can improve the accuracy of damage identification.
作者
马瑛剑
沈星
李春威
魏嘉成
汪雅婷
MA Yingjian;SHEN Xing;LI Chunwei;WEI Jiacheng;WANG Yating(College of Aeronautics,Nanjing University of Aeronautics&Astronautics,Nanjing 210016,China;AVIC GA Huanam Aircraft Industry Co.,Ltd.,Zhuhai 519090,China;Zhuhai Pilot Composites Science and Technology Co.,Ltd.,Zhuhai 519090,China)
出处
《南京航空航天大学学报(自然科学版)》
北大核心
2025年第4期732-738,共7页
Journal of Nanjing University of Aeronautics & Astronautics (Natural Science Edition)
作者简介
通信作者:沈星,男,博士,教授,博士生导师,E-mail:shenx@nuaa.edu.cn。
