三维四向编织复合材料细观建模

冯伟; 王延荣; 魏大盛

三维四向编织复合材料细观建模

北京航空航天大学能源与动力工程学院, 北京 100191

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出版历程
- 收稿日期: 2012-06-11
- 刊出日期: 2013-06-28

Meso-scale modeling of 3-D four-directional braided composites

School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

摘要

摘要: 基于编织过程中携纱器的运动规律,重点分析了编织复合材料内部区域的空间构型,提出了一种改进的细观单胞模型.该模型能够考虑因打紧工艺造成的纤维束轴线弯曲构型以及截面变形,并可以给出编织参数和模型宏细观参数之间的关系,结果表明:该模型比较接近实际结构,材料内部纤维束轴线空间走向为曲线,控制点处纤维束截面为椭圆形假设已接近其真实的截面形状,并且由该模型得出的胞元几何特征数据与试件实测数据较为吻合,对花节长度的预测值最大误差保持在3%左右,在编织角分别为19°,21°和21.5°时,本模型的预测结果更接近实测结果,适用于三维编织复合材料尤其是小编织角结构的建模,可为后续力学性能的分析提供基础.
- 三维编织复合材料 /
- 建模 /
- 细观结构 /
- 胞元 /
- 几何模型
Abstract: Based on the motion of yarn carriers on the braiding machine bed, the spatial configuration of interior yarns was analyzed in detail, and a meso-scale model of 4-step three-dimensional (3-D) braided composites was established. In this model, the cross-section deformation, the contact of fiber bundle and the bended centerline due to the mutual squeezing in the braiding process were taken into account. In addition, the structural geometry of the composites was analyzed and the mathematical relationship between the braided parameters and the structure of the unit cell was obtained. The results show that the hypotheses that axis of fiber bundle is curve inside the composites and the section of fiber bundle is oval at control points are close to the real structure and good agreement can be obtained between the calculated and measured values of the geometric characteristics of braided composite samples. The predicted value of unit cell height show that the maximum error remained at about 3%, in addition, when the braided angle is 19°, 21° and 21.5°, the prediction results are more close to the measured results. It is suitable for modeling of 3-D braided composites, especially the structure of small braided angle. Therefore, the model presents a foundation for the mechanical properties prediction of the composites.
- three-dimensional(3-D) braided composites /
- modeling /
- meso-structure /
- unit cell /
- geometrical model

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参考文献(16)

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