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。
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 to predict 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 the effectiveness 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.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2005年第1期133-138,共6页
Acta Materiae Compositae Sinica
关键词
三维编织
复合材料
几何模型
工程弹性常数
3D braided
composites
geometrical model
engineering elasticity constants
