摘要
采用控制体积法研究了以四步法编织矩形组合截面三维编织物的特殊细观结构。根据三维编织原理,得到编织物内各区域携纱器的运动规律。从中看出,除了常规矩形截面三维编织物所具有的内部、棱(外)角和表面区域外,矩形交接区域的内部、内角和表面具有特殊的细观结构。分析了矩形组合截面三维编织物所特有的矩形交接区域以及交接内部、交接内角和交接表面的细观结构,建立了这三个区域的单胞模型。结果表明,交接区域的内部单胞外形为立方体,交接区域的内角单胞外形为七棱柱体,交接区域的表面单胞为五棱柱体。与常规矩形截面的单胞相比,矩形组合截面在交接区域中,纱线的空间形态和编织角均存在明显不同。
The microstructure of a four-step 3D braiding preform with 1× 1 pattern and complex rectangular cross section was studied by means of the control volume method. The complex rectangular configuration refers to the geometrical shape jointed by two or more rectangles together. According to the formation rule of the braiding process, the paths of the carriers are traced, particularly in the joint region where two rectangles join together. In addition to the microstructures of the braiding preform in the interior, surface and corner of a simple rectangle, there are different microstructures in the joint region of the interior, surface and corner of the complex rectangle. Corresponding to the special microstructure in the interior, surface and corner in the joint region, three unit cell models were developed. The result shows that, in the joint region, the geometry of the unit cell in the interior, corner and surface is of a cube, a hepta-prism and a penta-prism, respectively. In addition, the braiding pattern and braiding angle of the unit cells in the joint region differ significantly from those of the simple rectangle of a 3D braiding preform.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2006年第3期165-169,共5页
Acta Materiae Compositae Sinica
基金
上海市自然科学基金项目(03ZR14007)
关键词
复合材料
三维编织
矩形组合截面
细观结构
单胞模型
composites
3D braiding
rectangular cross section
microstructure
unit cell model
