The far-field eddy current detection of inner layer crack of aviation multilayer riveted structures
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摘要:
多层铆接结构是飞机机身蒙皮与型材的主要结构。由于周期性载荷作用,其内部型材等承力部位易产生疲劳裂纹,该位置隐蔽性强,采用目视或常规无损检测技术难以检测出这些缺陷。而远场涡流检测技术可检测埋藏深度大的缺陷,采用该技术对飞机多层铆接结构的内层裂纹进行检测。结果表明：选择合适的检测频率时,检测信号阻抗的幅值与裂纹深度、检测信号阻抗的相位角与裂纹埋藏深度均呈良好的线性关系,对于确定的被检材料和检测传感器,得出的拟合公式可为裂纹损伤的定位、定量检测提供理论参考依据,从而获得裂纹的准确信息,实现裂纹损伤的准确定位和定量检测。
Abstract: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.
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Table 1 不同检测频率下,各深度裂纹处的信号幅值
裂纹深度/mm 检测频率/Hz 200 600 800 1 000 1 200 0.2 262.6 262.6 332.7 359.5 331.2 0.4 326.9 862.9 925.7 1 063.9 1 003.9 0.6 437.5 1 720.5 1 732.9 1 463.5 1 178.4 0.8 335.3 2 055.5 2 578.4 2 234.1 2 196.3 
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Table 2 检测频率为800 Hz时,0.6 mm深人工裂纹在不同埋深下的信号幅值与相位角
缺陷埋深/mm 信号幅值/mV 信号相位角/(°) 2.0 2 437.6 125.7 4.0 1 235.6 86.6 6.0 847.3 44.2
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