三维全五向编织复合材料弹性性能及热物理性能的有限元分析

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。

Finite element analysis of elastic property and thermo-physical properties of three-dimensional and full five-directional braided composites

Based on the meso-structure of three-dimensional and full five-directional(Q5D) braided composites, the parameric finite element model of three-dimensional and full five-directional braided composites was established. By using the reasonable boundary condition, the elastic constants, thermal conductivity coefficient and thermal expansion coefficient were calculated, which were in a good agreement with experimental results. Furthermore, the changing characteristics of elastic property and thermo-physical properties of the braided composites with the braided angle and volume fraction of fibers were described, and the calculation results were compared with the corresponding results of three-dimensional four-directional(4D) and five-directional(5D) braided composites. The results show that the mechanical properties, longitudinal thermal conductivity and the design of zero inflated structure of three-dimensional and full five-directional braided composites are better, providing a basis for the analysis of strength problem and the coupling problem of thermo-mechanics.