基于实验观察和理论研究，重点分析了材料内部区域纤维束的空间构型，建立了一个新的三维实体细观结构模型，并指出了编织工艺参数和模型细观结构参数之间的关系。该模型较真实地反映了纤维束之间的相互挤压变形方式，纤维束横截面积沿纤维束轴向不断变化，更符合三维四向编织复合材料的实际结构。基于刚度体积平均及柔度体积平均混合思想，建立了相应的刚度预报模型。用该模型计算编织复合材料几何特性及工程弹性常数的数值结果与试件实测数据吻合，表明了该模型的合理有效性，为进一步研究三维编织复合材料的拉伸强度及破坏机制提供了基础。
Based on the existing experiment observation and theoretical research, the spatial configuration of interior yarns was analyzed in detail, a new microstructure model of 3D braided composites was established and the mathematical relationship between technics parameters and microstructure model parameters was obtained. The new model truly reflects the jamming pattern between yarns and its cross- section variation along the axial of the yarns coinciding with the actual configuration of the 3D and four-directional braided composites. A model to predict stiffness was then established based on the stiffness volume average method and flexibility volume average method. The calculated simulation values of the geometric characteristics and elastic constants of braided composites well agree with the measured values, which prove the effectiveness of the model. The present model has presented a foundation for the strength prediction and failure mechanism of the 3D braided composites.
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