Laser ultrasonic identification method for surface cracks on cylindrical metal components

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (5) : 10-17.

LIU Xuekun,YANG Shixi,LIU Yongqiang,CHI Yongwei, HE Jun

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Abstract

Here, in order to effectively identify cylindrical surface cracks with laser ultrasonic technique, a method of cylindrical surface wave signal enhancement and wavelet packet-singular value decomposition (WPT-SVD) was proposed to identify location and depth of surface cracks on cylindrical metal components.A laser ultrasonic explicit finite element model for a cylinder was established to analyze effects of cylindrical surface cracks on mode transformation of surface waves.The position of a cylindrical surface crack was identified using the phenomenon of laser ultrasonic scanning signal being enhanced during cylindrical surface crack being near excitation source.After crack location was identified, time-frequency characteristics of crack detection signal were analyzed, and these time-frequency characteristics were extracted using WPT-SVD.The parameter kr was defined to characterize crack depth change, and cylindrical surface crack depth was identified.Here, a laser ultrasonic cylindrical surface crack detection test system was built to conduct test study.The test results showed that the proposed method of cylindrical surface wave signal enhancement and WPT-SVD can be used to identify position and depth of cylindrical surface cracks.

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laser ultrasonic / cylinder / surface crack / identification

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LIU Xuekun,YANG Shixi,LIU Yongqiang,CHI Yongwei, HE Jun. Laser ultrasonic identification method for surface cracks on cylindrical metal components[J]. Journal of Vibration and Shock, 2020, 39(5): 10-17

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