基于电学成像的蜂窝夹层结构超高速撞击损伤监测  

Monitoring of hypervelocity impact damage to honeycomb sandwich structures by using electrical tomography

作　　者：束嘉俊 周登 严刚[1] 李干 王永伟[1] SHU Jiajun;ZHOU Deng;YAN Gang;LI Gan;WANG Yongwei(State Key Laboratory of Mechanics and Control of Mechanical Structures,College of Aerospace Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;State Key Laboratory of Disaster Prevention and Mitigation of Explosive and Impact,College of National Defense Engineering,Army Engineering University of PLA,Nanjing 210007,China)

机构地区：[1]南京航空航天大学航空学院机械结构力学及控制国家重点实验室,南京210016 [2]陆军工程大学国防工程学院爆炸冲击防灾减灾国家重点实验室,南京210007

出　　处：《中国空间科学技术》2022年第4期69-76,共8页Chinese Space Science and Technology

基　　金：航空科学基金(2017ZA52005);南京航空航天大学基本科研业务费项目(NS2021002)。

摘　　要：针对航天器遭受空间碎片和微流星体撞击的问题,对蜂窝夹层结构的超高速撞击损伤监测进行研究。提出将碳纳米管薄膜共固化在蜂窝夹层结构面板表面使之具有自感应能力,结合电学成像技术对超高速撞击造成的损伤进行监测和识别。采用二级轻气炮对自感应蜂窝夹层结构进行了超高速撞击,在撞击前后分别向感应层注入微小的激励电流,根据边界电压变化重建损伤引起的电导率变化图像,从而提供有关撞击和损伤的信息。试验结果表明,基于碳纳米管薄膜的感应层性能良好,重建的电导率变化图像能够较好地反映损伤个数、位置和近似尺寸,验证了所提出技术方法的有效性,为航天器结构超高速撞击监测提供了一种新的技术手段。Aiming at the impact problem of spacecraft by micrometeoroid/orbital debris(MMOD)at hypervelocity,monitoring of the hypervelocity impact damage to honeycomb sandwich structures was studied.A method was proposed to co-cure carbon nanotube(CNT)film on the surface of honeycomb sandwich structure to enable it have self-sensing capability to detect and identify hypervelocity impacts and their associated damage by using electrical tomography technique.Experimental studies were conducted with a two-stage light gas gun to perform hypervelocity impacts to the self-sensing honeycomb sandwich structures.By injecting tiny currents into the CNT sensing layers before and after hypervelocity impacts,the conductivity changes caused by hypervelocity impacts were reconstructed by the change of boundary voltages,providing valuable information about the impact and damage.The experimental results show that,the CNT sensing layers have good performance,and the reconstructed images of conductivity changes can reflect the number,locations and approximate sizes of the damage,validating the effectiveness of the proposed method and providing a new technical method for spacecraft to monitor hypervelocity impacts.

关 键 词：蜂窝夹层结构 超高速撞击 碳纳米管薄膜 电学成像 损伤识别 

分 类 号：V414.6[航空宇航科学与技术—航空宇航推进理论与工程]