三维四向编织复合材料的几何建模及刚度预报

详细信息

ON GEOMETRICAL MODEL AND STIFFNESS PREDICTION OF3D 4-DIRECTIONAL BRAIDED COMPOSITES

1.
Research Institute of Structures and Strength, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2.
Shenyang Aircraft Design Institute, Shenyang 110035, China

摘要

摘要: 提出了四步法三维四向矩形编织复合材料的单胞几何模型, 该模型考虑了空间纤维束的相互扭结和挤压而造成的纤维束弯曲和截面形状变化。基于刚度体积平均思想, 采用微元段直纤维的单向层板刚度分析方法建立了相应的刚度预报模型, 得到了材料的工程弹性常数, 数值结果表明了该模型的有效性;分析了工艺参数和纤维束横截面形状对弹性常数的影响规律, 得到了一些有益结论。
- 三维编织 /
- 复合材料 /
- 几何模型 /
- 工程弹性常数
Abstract: A unit cell geometrical model for 4-step 3D 4-directional rectangular braided composites is proposed. The effect of bending and cross-sectional variation of the yarns due to their mutual squeeze is considered in the model. A model topredict stiffness is then established based on the stiffness volume average method and on the laminated plate theory by assuming that differential yarns are straight . Thus the elastic material constants can be obtained. Numerical results show theeffectiveness of the model. The influences of the technics parameters and the cross-sectional shape of yarn on the engineering elastic constants are also studied , and some conclusions are drawn based on the results reported herein.
- 3D braided /
- composites /
- geometrical model /
- engineering elasticity constants