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| Probability of detection of cracks in metal structures using guided wave based on a signal response analysis model |
| WANG Li1,2，YANG Yu2，LIU Guoqiang2，WANG Xiaguang2，LI Jiaxin2，REN Yipeng2 |
| 1.State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2.National Laboratory of Strength and Structural Integrity, Aircraft Strength Research Institute of China, Xi’an 710065, China |
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Abstract In order to realize the condition-based maintenance and formulate the inspection and maintenance scheme during the service, probability of detection (POD) for guided wave damage monitoring technology must be clarified, as a new nondestructive testing method. This paper presents a novel POD computation method for guided wave based on signal response analysis model. First, the statistical computation model of POD is obtained by establishing the mapping relationship between the damage features of online response guided waves and fatigue crack. Then, by analyzing the quantitative effect of uncertainties of fitting parameters on the statistical computation model, POD computation models under different confident levels are obtained. The proposed method is validated on fatigue cracks monitoring experiments on metal center-hole and lap specimens. The results show that damage features, fitting functions and transducers monitoring schemes all have effects on POD, and the detectable crack length under 95% confidence level and 90% detection probability for center-hole and lap metal structures are about 2.6 mm and 9.5 mm.
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Received: 03 February 2023
Published: 28 January 2024
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