摘要
基于超声头波(head-waves)理论,当探头以一定角度激励出的折射纵波传播到界面时产生能量较高的爬波,据此建立了连续SiC纤维增强钛合金基复合材料(Ti-MMC)整体叶环中SiC纤维环断丝缺陷超声爬波检测的有限元仿真模型,分析了多层介质界面超声波传播特性及爬波遇到断丝缺陷时的衍射现象。仿真结果表明,在缺陷上方的水层中会产生明显的缺陷信号波。根据仿真结果,设计制作了超声爬波(5 MHz,20°)-水浸聚焦(5 MHz,直径6 mm)组合探头和带有纤维断丝的人工缺陷试样,采用超声C扫描设备进行了检测实验。结果表明,超声爬波法能够成功地检测纤维环试样中不同深层的3层断丝缺陷(裂纹自身高度约0.42 mm)。该方法简单、经济、快速,有望解决Ti-MMC整体叶环中深埋型纤维环断丝缺陷的无损检测难题。
The fiber fracture is a very dangerous defect in the aeroengine integral bladed rings which is manufactured by continuous SiC fibers-reinforced titanium alloy matrix composite(Ti-MMC).Currently the lack of an effective method for inspecting the fiber fracture seriously influences the quality control of the aeroengine integral bladed rings,therefore solving the problem of non-destructive testing for deep buried radial micro-cracks is an insurmountable barrier for the application of Ti-MMC integral bladed rings in aviation.In this work,based on the theory of ultrasonic head-waves,the refraction longitudinal waves with the proper angle generated by the creeping wave probe are propagated on the interface,which means the creeping wave with high energy is generated.The finite element simulation model of the creeping wave is established for inspecting the defect of Si C fibers breakage in Ti-MMC aero-engine bling structure.Based on the results of the finite element simulation,significant defect signal waves are generated in the water layer above the defect.After that,not only the ultrasonic propagation characteristics at the interface of multilayer media but also the diffraction phenomenon of the creeping wave when they encounter the broken wire defect are analyzed.And the detection signal amplitude is not only affected by the incident angle of the creeping probe but also is related to the thickness of titanium alloy.In order to receive the diffracted waves with high sensitivity,the assembled probe,which is composed by a creeping wave exciter(5 MHz,20°)and an immersion focusing sensor(5 MHz,diameter 6 mm),is specially designed and manufactured according to the results of the finite element simulation.In addition,the artificial sample with the broken fiber is prepared and then tested by the ultrasonic C-scan testing system with the assembled probe.The results show that the three-layer broken wire defects(the crack height is about 0.42 mm)with different depths in the artificial sample can be detected successfully.The C-scan results can match the defect positions of the artificial sample which means this detection method is valid.This method is simple,economical and fast,and is expected to solve the problem of nondestructive testing for broken wire in the deep embedded fiber ring in the Ti-MMC aero-engine bling structure.
作者
武玉鹏
张博
李经明
张双楠
吴颖
王玉敏
蔡桂喜
WU Yupeng;ZHANG Bo;LI Jingming;ZHANG Shuangnan;WU Ying;WANG Yumin;CAI Guixi(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China)
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2020年第8期1175-1184,共10页
Acta Metallurgica Sinica
基金
国家自然科学基金项目No.51605468
中国科学院仪器设备功能开发技术创新项目No.Y8M1734171
辽宁省自然科学基金项目No.2019-MS-334。
关键词
整体叶环
连续SIC纤维
复合材料
超声检测
爬波
integral bladed ring
continuous SiC fiber
composite
ultrasonic testing
creeping wave
