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在三维全五向(Q5D)编织复合材料细观结构模型的基础上,建立了其单胞参数化有限元模型。通过施加合理的边界条件,计算得到了Q5D编织复合材料的弹性常数、热传导系数和热膨胀系数,所得结果与现有的实验数据吻合较好。在此基础上,深入研究了纤维体积分数、编织角等工艺参数对材料弹性性能和热物理性能的影响规律,并将计算结果与三维四向(4D)和三维五向(5D)编织复合材料的相应结果进行了对比。结果表明,Q5D编织复合材料具有较好的力学性能和纵向导热性能,其零膨胀结构的可设计性更强,为进一步研究此种结构材料的强度问题和热力耦合问题奠定了基础。
Based on the three-dimensional all-five (Q5D) woven composite meso-structure model, the single-cell parametric finite element model was established. Through the application of reasonable boundary conditions, the elastic constant, thermal conductivity and thermal expansion coefficient of Q5D braided composites were calculated. The obtained results are in good agreement with the existing experimental data. On this basis, the influences of fiber volume fraction, braiding angle and other parameters on the elastic properties and thermophysical properties of the materials were studied in detail. The results were compared with those of the three dimensional (4D) and three dimensional (5D) braided composites The corresponding results were compared. The results show that the Q5D braided composites have good mechanical properties and longitudinal thermal conductivity, and the design of zero-expansion structure is stronger, which lays the foundation for further study on the strength and thermal coupling of such structural materials.