| Composite material is widely applied in the industrial field due to its excellent properties. Because of many excellent properties of carbon fiber, it can be used as reinforcement to compose all kinds of carbon fiber composite materials with different substrates. In the area of the spacecraft thermal protection, carbon fiber composites play a significant role. Therefore, studying the radiation characteristics of carbon fiber composite materials and identifying the factors affecting the thermal radiation characteristics has important significance to improve the emission rate of carbon fiber materials and to enhance the performance of the spacecraft’s thermal protection.When carbon fibers are used as reinforcement, it can be combined with different substrates after weaving single or bunchy carbon fiber material. In this paper, the carbon fiber bundle is chosen as the research object. In order to research the impact of structural materials on its radiative characteristics, Monte-Carlo method and programme by Matlab are used. The main research content contains:In the two-dimensional structure, researched the influence of the structures and the diameter of fiber bundle and the distance between them on radiative characteristics. In aligned arrangement, staggered arrangement and disordered arrangement, researched the influence of the structures on radiative characteristics. In aligned arrangement, the influence of the diameter of fiber bundle and the distance between them on radiative characteristics is researched; in disordered arrangement, the volume ratio of fiber bundle on radiative characteristics is researched.Created the mathematical model of 2.5D and 3D wringing woven. When it comes to simulate 2.5D and 3D wringing weave by Monte-Carlo method, due to the complexity of the structure, some simplifications have to be made out in the actual structure of the fiber bundle to obtain the mathematical description of the surface of a fiber bundle. The fiber bundles simplify as cylinders, and the cylinders will bend, when they are woven. The axis of curving fiber bundle can be described as a cosine curve approximately, and the final mathematical description of fiber bundles descripted by parametric equation.In 3D disordered arrangement, the volume ratio of fiber bundle on radiative characteristics is analyzed; In 2.5D and 3D wringing weaves, the results are compared after simulating the radiative characteristics; In 3D wringing weaves, the number of layers and relative position between adjacent layers on radiative characteristics are considered; beside that, the density of weave is studied in 2.5D and 3D wringing weaves. The study found that the shape of weave arrangement, the volume ratio of fiber bundle, physical dimension, the number of layers, relative position between adjacent layers and the density of weave could affect the radiative characteristics of carbon fiber. |
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