三维编织复合材料热物理性能的有限元分析

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,迸一步研究了编织角、纤维体积分数、编织结构等参数对材料热物理性...

Finite Element Analysis on Thermo-physical Properties of 3D Braided Composites

Based on the meso-structure of three-dimensional (3D) braided composites, the finite element models of thermo-physical properties of four-directional and five-directional composites are established. By using the periodic non-adiabatic temperature boundary condition and displacement boundary condition, the global effective thermal conductivity coefficient and thermal expansion coefficient are calculated, which are in a better agreement with experimental results than the previous literature. Based on this, the law of thermo-physical properties influenced by material parameters (i.e. braiding angle, fiber volume fraction and braiding structure) are also studied. The thermo-physical properties of 3D braided composites are significantly anisotropic, and the tendency of the thermal expansion properties with material parameters is more non-linear than the thermal conductivity properties.