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根据三维编织复合材料的细观结构,分别建立了三维四向和五向编织复合材料热物理性能的有限元模型。采用周期性的非绝热温度边界条件和位移边界条件,计算了三维四向和五向编织复合材料的整体等效热传导系数和热膨胀系数,计算结果同已有文献相比与实验值符合得更好。在此基础上,进一步研究了编织角、纤维体积分数、编织结构等参数对材料热物理性能的影响规律。结果表明,三维编织复合材料的热物理性能具有明显的各向异性,热膨胀性能随参数的变化规律相比热传导性能更具非线性特征。且所得结果与实验值符合较好,证实了本文模型的有效性,为材料热学问题和力热耦合问题的分析提供了有用参考。
According to the mesostructure of the three-dimensional braided composites, the finite element models of the thermophysical properties of three-dimensional four-directional and five-directional braided composites were established respectively. Using the periodic non-adiabatic temperature boundary conditions and the displacement boundary conditions, the overall equivalent thermal conductivity and thermal expansion coefficient of three-dimensional four-directional and five-directional braided composites were calculated. The calculated results are in good agreement with the experimental results . On this basis, further study of the impact of brazing angle, fiber volume fraction, braided structure and other parameters on the thermal properties of the material. The results show that the thermophysical properties of the three-dimensional braided composites have obvious anisotropy. The thermal expansions are more nonlinear than the thermal conductivity with the variation of the parameters. The obtained results are in good agreement with the experimental data, which proves the effectiveness of the proposed model and provides a useful reference for the material thermal analysis and the analysis of the coupling of heat and force.