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

Finite element analysis of effects of core structures on compression-resistance of fiber reinforced composites

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2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2种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)小。此外,对于"O"形芯材而言,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。

In order to explain the effects of core structures on the mechanical behavior of hollow fiber reinforced composites, the dynamic responses of π-shaped and O-shaped core structural fiber reinforced composites under the same cmnpression loading condition were compared by finite element analysis （FEA） based on yarn core and resin. Comparative analysis of the deflection-time curves, structural stress distributions, locations of maximum and minimum stress and equilibrium degree of stress of the two types of composites showed that the deflection magnitude of the O-shaped core composite was obviously less than that of the π-shaped core composite. Moreover, for the O-shaped 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 reduce the non-equilibrium degree of the stress and hence can absorb and dissipate more energy.