22 August 2011 The numerical simulation of laser-generated ultrasound to detect the debonding in the honeycomb sandwich board
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Abstract
Among complex materials, honeycomb sandwich structure has a lot of advantages. However, it is usually found poor bonding or even debonding. Some convenient nondestructive methods should be found to measure the defect efficiently. Laser-generated ultrasound detection is a new nondestructive method with a bright future. Compared with traditional methods, the advantages of non-contact and high resolution in spatial and temporal made it applicable not only in measuring defects with high precision, but also in the characterization of various complex shapes. In this paper, to detect the debonding of the honeycomb sandwich board, the laser-generated ultrasound technology was used. By the use of the finite element method (FEM), a 2D model dealing with laser-generated ultrasound in the honeycomb sandwich board was presented. Take into account of the debonding problem, by adopting the scanned laser source, the propagation of Lamb wave and longitudinal wave were studied. The debonding in the honeycomb sandwich board was assessed though the characteristic of the Lamb wave and longitudinal wave in time domain and frequency domain.
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Ling Yuan, Ling Yuan, Yi-ping Cui, Yi-ping Cui, Zhujun Gu, Zhujun Gu, Zhong-hua Shen, Zhong-hua Shen, Xiao-wu Ni, Xiao-wu Ni, } "The numerical simulation of laser-generated ultrasound to detect the debonding in the honeycomb sandwich board", Proc. SPIE 8192, International Symposium on Photoelectronic Detection and Imaging 2011: Laser Sensing and Imaging; and Biological and Medical Applications of Photonics Sensing and Imaging, 81923V (22 August 2011); doi: 10.1117/12.901027; https://doi.org/10.1117/12.901027
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