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20 April 2012 High-frequency guided ultrasonic waves for the detection of hidden defects in multi-layer aerospace structures
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High-frequency guided ultrasonic waves allow for the non-destructive testing of aerospace structures. This type of structure often contains multi-layer components subjected to cyclic loading conditions, where fatigue cracks and localized disbonds can develop. Using standard ultrasonic transducers, high frequency guided wave modes were generated in a model structure consisting of two adhesively bonded aluminum plates. This type of waves propagates along the structure and penetrates through the complete thickness. The wave propagation along the specimen was measured experimentally using a laser interferometer. Good agreement with 2D finite element simulations was found. Two types of hidden defects were considered: localized lacks of sealant and small defects in the aluminum layer facing the sealant. The interaction of the high frequency guided waves with the hidden defects was investigated. Standard pulseecho measurements were conducted to verify the detection sensitivity and the influence of the stand-off distance predicted from the finite element simulation results. The high frequency guided waves have the potential for fatigue crack growth monitoring at critical and difficult to access fastener locations in aerospace structures from a stand-off distance.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
B. Masserey, C. Raemy, and P. Fromme "High-frequency guided ultrasonic waves for the detection of hidden defects in multi-layer aerospace structures", Proc. SPIE 8348, Health Monitoring of Structural and Biological Systems 2012, 834815 (20 April 2012);

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