在实验观察的基础上,考虑轴纱的挤压变形及纱线填充因子变化,修正了现有的细观结构模型,建立了更加真实反映三维五向编织复合材料内部编织结构的单胞模型.利用该模型采用3D有限元法计算了材料的轴向弹性模量,数值预测与实验数据吻合较好.分析了单胞在拉伸载荷作用下的细观应力分布,为材料进一步的强度预测奠定了基础.
On the basis of microscopic observations, a reasonable 3D unit cell model of 3-dimensional (3D) five-directional braided composites was established. The yarn packing factor and the cross-section deformation due to the later compression, which were neglected in the existing model, were both considered in the model. Based on the unit cell model, the elastic modulus of the material was calculated by 3D finite element analysis (FEA).The numerical results show good agreement with the experiment data. The stress field of the model under tensile load was analyzed, which provides a basis for farther strength prediction.
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