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根据材料的细观结构,采用APDL语言分别建立了纤维束和三维编织复合材料两级单胞的参数化几何模型;推导了Prony级数表示的树脂粘弹性本构方程,对模型进行了组分材料参数设置;对纤维束单胞模型进行扫掠式网格划分,对三维编织复合材料单胞模型进行线-面-体式网格划分;对两级单胞模型均施加合理的边界条件,使单胞边界上的位移满足周期性和连续性。以有限元模型为基础,计算了三维编织复合材料的粘弹性能,并给出了材料粘弹性效应随工艺参数变化的规律。计算结果表明:三维编织复合材料编织方向的粘弹性效应随编织角的增大而增强,随纤维体积比的增大而减弱。该结果与已有实验结论一致。
According to the mesostructure of materials, parametric geometric model of two-level unit cell of fiber bundle and three-dimensional braided composites was established by APDL language respectively. The viscoelastic constitutive equation of resin represented by Prony series was deduced, Material parameters were set up. The fiber cell model was swept mesh, and the three-dimensional braided composite cell model was line-plane-body mesh. The boundary conditions were applied to the two-cell model The displacement on the cell boundary satisfies the periodicity and continuity. Based on the finite element model, the viscoelastic properties of the three-dimensional braided composites were calculated and the law of the viscoelasticity of the braided composites with the process parameters was given. The calculated results show that the viscoelasticity of three-dimensional braided composites increases with the increase of braid angle, and decreases with the increase of fiber volume ratio. The result is consistent with the experimental conclusion.