三维五向编织复合材料导热性能的有限元分析

根据三维五向编织复合材料的细观结构模型,分别假设编织纱线和轴纱具有六边形和正方形横截面,建立了计算三维五向编织复合材料导热性能的有限元模型.采用有限元方法,设定合理的边界条件,计算了三维五向编织复合材料的横向和纵向热传导系数,并与三维四向编织复合材料的热传导系数进行了比较,分析了编织角和纤维体积含量对热传导系数的影响规律.此外,还确定了材料内部的温度、热梯度及热流量的分布,为材料热力耦合问题的分析奠定了基础. 

Finite element analysis of thermal conductivity of three dimensional and five directional braided composites

The finite element model for thermal conductivity was established based on the micro-structure of 3-D & 5-Dbraided composites and the assumption of the braiding yarn with the hexagon section and the axial yarn with the square section.The transverse and longitudinal thermal conductivity coefficients of 3-D & 5-Dbraided composites were calculated by the finite element method and compared with the corresponding results of 3-D & 4-Dbraided composites.The influences of the braiding angle and fiber volume fraction on the thermal conductivity coefficient were also analyzed.In addition,the distributions of the temperature,the thermal gradient and thermal flux of composites were determined,providing a basis for the analysis of the coupling problem of thermo-mechanics.