碳纖維增強(qiáng)塑料的渦流熱成像檢測研究
[Abstract]:Carbon fiber reinforced composite plastic is a common high strength, light quality composite material, which is often used in aerospace field with high environmental requirements, reinforcement of bridge structure, body parts of new energy vehicle, sports equipment with high strength demand and so on. The extensive application of carbon fiber reinforced composites has brought new challenges to nondestructive testing technology and nondestructive evaluation. The purpose of this paper is to evaluate the testing effect of phase-locked vortex thermal imaging technology on carbon fiber reinforced plastics with various complexity. According to the complexity of the tested materials, the process of this study is divided into three stages. First, for unidirectional non-braided carbon fiber reinforced composite plastics with thickness of about 1 mm, the conductive and thermal conductivity in the direction of fiber is higher, so it belongs to anisotropy material. Using rectangular coil to detect vortex thermal imaging, it is observed that there is an obvious long strip low temperature region along the direction of carbon fiber in the heating area of the material at the bending angle of the rectangular coil, and the area is regarded as the heating blind zone. By adding the test block rotation experiment and changing the clamping mode of the induction coil, the above experiments are repeated by circular, disk cake shape and Helmholtz coils, respectively. The reason of specific coil-material geometric position is denied, and the influence of coil geometry is excluded. The finite element simulation results rule out the possibility of defects in the material itself. Secondly, after evaluating the simplest carbon fiber material, it is necessary to clarify the detection ability of the technology to the more complex material, and to add thermal imaging to the bidirectional six-layer fiber compression plywood. The results show that the phase diagram can clearly show the fiber texture of the multi-layer material, and the Eddy current heating of the material belongs to the bulk heating mode by fitting the relationship between the amplitude signal and the modulation frequency. Thirdly, the experiment of vortex thermal imaging for impact damage of multi-layer braided carbon fiber materials is carried out, and the results of LED array optical thermal imaging and 3D computer aided tomography are compared. it is found that when the impact energy exceeds 3 J, the damage detection effect of vortex thermal imaging is better than that of LED optical thermal imaging. In addition to the experimental evaluation of the above three kinds of materials with different complexity, the numerical simulation results of the vortex distribution in the material show that the vortex component in the vertical direction of the fiber is only 1% of that in the direction of the fiber, but it is the first factor to determine the heating effect. At this point, the heating characteristics of anisotropic carbon fiber materials can be partially determined. In this study, the detection effect of swirl thermal imaging on carbon fiber reinforced composite plastics with different complex grades was evaluated. The induction heatability of unidirectional fiber is clarified, and the discovery and interpretation of heating blind zone phenomenon also fill in the blank of the previous study on the effect of unidirectional carbon fiber vortex heating. The study also analyzes the effectiveness of vortex thermal imaging in the detection of impact damage, which provides a new solution for the nondestructive testing of this kind of material.
【學(xué)位授予單位】:西南交通大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TQ327.3
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