芯材结构对纤维增强复合材料抗压性能影响的有限元分析

为了说明芯材结构对中空纤维增强复合材料力学行为的影响，通过有限元分析的方法，在纱线芯材、树脂尺度上计算并比较“π”形与“O”形这两种不同芯材结构纤维增强复合材料在相同压力作用下的动态响应。通过对比分析两种材料结构的挠度随时间的变化、应力在结构中的分布、最大、最小应力所在位置以及应力均衡度等发现：复合材料（“O”形芯材）的变形程度比复合材料（“π”形芯材）的变形程度小。此外，对于前者而言，其应力集中部位处于几何结构对称的中心线上，这种对称性对材料结构的整体承力有利，且应力的不均衡度较小，使其能够吸收与耗散较多的能量。

Finite element analysis of effects of core structures on compression-resistance offiber reinforcement composites

In order to summarize the effects of core structures on mechanical behavior of the hollow fiber reinforcement composites, the dynamic responses of “π”shape and “O” shape core structural fiber reinforcement composites under the same compression loading condition were calculated and compared by finite element analysis (FEA) in the level of yarn core and resin. By omparatively analyzing the deflection-time curves, structural stress distributions, the locations of maximum and minimum stress and quilibrium degree of stress of the two type of composites, it was found that the deflection magnitude of the“O”shape core composite was obviously less than that of the“π”shape core composite. Moreover, for the “O”shape core composite, its stress concentration region located at the symmetrical central line of geometrical structure, which was very beneficial to the overall loading-bearing behavior of the composite structure. In addition, it may induce the greater stress equilibrium degree, all of these factors made this type of structural material to absorb and dissipate more energy during the loading process.