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| Transmission characteristics of high order Lamb wave modes at corrosion damages |
| CHEN Feiyu1,2, LUO Zhi3, CAO Xuwei4 |
1.No.713 Institute, China Shipbuilding Industry Corporation, Zhengzhou 450015, China;
2.Henan Provincial Key Lab of Underwater Intelligent Equipment, Zhengzhou 450015, China;
3.School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China;
4.School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China |
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Abstract The cutoff property of higher order Lamb modes is a powerful tool for the detection of corrosion in large-area plate and shell structures. Investigation on the transmission characteristics of higher order Lamb modes at corrosion with different widths and depths provides a theoretical basis for optimizing the excitation mode and frequency. Based on finite element method and single mode excitation technology, the variation of the time of flight (ToF), the amplitude of transmitted wave and the deformation of waveform are analyzed, when the A1 mode slightly above its cutoff frequency encounters corrosion. This study lays a foundation for exploring the mechanism of damages inversion based on high-order mode Lamb waves.
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Received: 25 August 2021
Published: 15 January 2023
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