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

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

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 meso-structure of three-dimensional and full five directional（QSD） 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（SD） 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.