基于超聲LAMB波的碳纖維復(fù)合材料分層缺陷識別的研究
[Abstract]:Carbon fiber composites are widely used in various fields because of their superior comprehensive properties. In the process of using carbon fiber composites, because of the defects of the materials themselves, or the defects of some components and equipment made of carbon fiber composite materials in the process of use, they will bring safety risks to the users. It even caused huge losses. Therefore, the detection of material defects is a particularly important link. Ultrasonic nondestructive testing (NDT) is an advanced nondestructive testing technology, and computer tomography is widely used in medical field. The main content of this paper is to combine ultrasonic nondestructive testing with computer tomography to detect and identify delamination defects of carbon fiber composites. The main contents are as follows: the propagation characteristics of ultrasonic wave in the same and anisotropic materials are studied by consulting the literature at home and abroad, and the dispersion equations and dispersion curves of ultrasonic Lamb in these two different materials are given respectively. It provides a theoretical basis for extracting the excitation signal and travel time of ultrasonic Lamb wave in finite element simulation and experiment. The theoretical basis of computer tomography technology is introduced in detail, and the mathematical formulas of parallel scanning filtering backprojection algorithm and sector scanning filtering backprojection algorithm based on central slice theorem are derived. At last, the detailed steps of the two algorithms are given. Finally, the sector scan filter backprojection algorithm is selected for the simulation and experiment of the image reconstruction algorithm. Carbon fiber composite multidirectional plate T300 / 5028 is chosen as the research object in this paper. The thin plate models with delamination defects in different positions are established by using ABAQUS finite element software. The propagation of ultrasonic Lamb wave in thin plate is simulated by loading sinusoidal signal of Hanning window with five periods, and the travel time data of sector scanning projection mode are extracted. The program of sector scan filter backprojection algorithm is written by MATLAB, and the extracted travel time data are replaced in the algorithm to reconstruct the thin plate model, and the defect information is clearly visible. Finally, the experimental platform is built and the imaging results of the experiment are obtained. Because of the limitation of the experimental conditions, the imaging quality of the experiment is not as high as that of the simulation, but the imaging effect is also considerable, and the reasons for this phenomenon are also analyzed. Through the combination of simulation and experiment, it is proved that this technique can be applied in engineering practice, which lays a foundation for further research.
【學(xué)位授予單位】:電子科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TB33
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