小径管超声导波检测有效检测距离研究  

Ultrasonic Defect Detection of Helium-Cooling Pipeline:A Simulation and Experimental Study

作　　者：陈仕琳 杨庆喜[1] 汪亮 宋云涛[1] Chen Shilin;Yang Qingxi;Wang Liang;Song Yuntao(Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China;School of Mechanical Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]中国科学院合肥物质科学研究院等离子体物理研究所,合肥230031 [2]中国科学技术大学,合肥230026 [3]合肥工业大学机械工程学院,合肥230009

出　　处：《真空科学与技术学报》2020年第12期1191-1196,共6页Chinese Journal of Vacuum Science and Technology

基　　金：CFETR装置总体集成和工程设计(2017YFE0300503)。

摘　　要：针对CFETR装置中真空管道的在役检测及维护方法,指出现有氦质谱检测技术的局限性。在此基础上,提出超声导波检测技术应用于真空管道检测,并且对应用中关键问题进行讨论。应用有限元法,分析了已确定结构及材料的管道检测的超声模态及波结构。在此基础上进行对检测距离进行数值模拟仿真,结果表明:对直径32 mm壁厚3 mm不锈钢管道,可单次检测出1 mm×4 mm×0.5 mm的表面裂纹,有较好的检测特性。最后,通过现场试验分析,得到检测信号反射系数与距离的关系(信噪比关系),对仿真进行了验证。Herein,we addressed the ultrasonic detection of defects of helium cooling pipeline,installed in the large vacuum chamber of China Fusion Engineering Test Reactor(CFETR).The interaction,of the ultrasonic-wave with an artificial macroscopic crack in stainless steel pipeline,was mathematically modeled,theoretically analyzed,numerically simulated in finite element method and experimentally evaluated.The influence of the crack’s position on the detection accuracy was also investigated.The preliminary results show that when it comes to a well-defined large crack,the non-destructive ultrasonic defect detection may obviously outperform the conventional helium mass spectroscopy leak detection.For instance,an artificial crack(1 mm×4 mm×0.5 mm)was rapidly,easily and accurately detected in a"single shot";and the simulated and measured results were in good agreement.However,much work remains to be done to regularly detect irregularly-shaped tiny little hole(s)in the vacuum pipeline.

关 键 词：真空管道 超声导波 缺陷定位 检测距离 

分 类 号：TG115.285[金属学及工艺—物理冶金]