The multilayer riveted structure is the main structure of aircraft fuselage skin and profiles.Due to periodic loading,fatigue cracks are prone to occur in load-bearing parts such as internal profiles,which are highly concealed and difficult to detect using visual and conventional nondestructive testing techniques.The far-field eddy current detection technology can detect defects with a large burial depth,so it was applied to the inner layer crack detection of aircraft multilayer riveted structures.The results indicated that the amplitude of the detection signal impedance had a good linear relationship with the crack depth,and the phase angle of the detection signal impedance had a good linear relationship with the crack burial depth by selecting an appropriate detection frequency.For the determined tested material and detection sensor,the fitting formula obtained can provide a theoretical reference for the localization and quantitative detection of crack damage,thus obtaining accurate information of cracks and achieving accurate localization and quantitative detection of crack damage.
关键词
多层结构/内层裂纹/远场涡流检测/阻抗幅值/阻抗相位角
Key words
multilayered structure/inner layer crack/far field eddy current testing/impedance amplitude/impedance phase angle
维普
万方数据