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提出了二维二轴1×1和2×2编织复合材料的几何模型,模型考虑了纤维束的相互挤压及横截面的变化。基于细观分析和体积平均法,建立了预测二维二轴编织复合材料弹性性能的理论分析方法。数值结果与试验结果吻合,表明该方法行之有效,且具有运算快、精度高、适合工程分析等优点。分析了编织角、纤维体积含量和纤维束横截面形状对材料弹性常数的影响。研究表明,编织角对弹性常数的影响具有互补性,材料弹性模量与纤维体积含量成正比,纤维束截面形状变化对材料弹性常数影响不大。
The geometric model of two-dimensional biaxial 1 × 1 and 2 × 2 braided composites was proposed. The model considered the mutual squeezing of fiber bundles and the change of cross-section. Based on the mesoscopic analysis and the volume average method, a theoretical analysis method of predicting the elastic properties of two-dimensional biaxial braided composites was established. The numerical results agree well with the experimental results, which show that the method is effective and has the advantages of fast calculation, high precision and suitable for engineering analysis. The influence of braid angle, fiber volume content and fiber bundle cross-section shape on the material elastic constants was analyzed. The results show that the influence of braiding angle on the elastic constants is complementary. The elastic modulus of the material is proportional to the fiber volume content, and the change of fiber bundle cross section has little effect on the material elastic constant.