三维四步方形编织结构的几何建模

研究三维复合材料的编织结构是分析这种材料力学性能的前提。从三维编织工艺和实际的编织过程出发,针对方形编织结构提出了一种单元几何模型。该模型以携纱器循环一周返回到起始位置所形成的纱线编织结构作为单元,保证了纤维束的连续性和材料整体结构的完整性。对每根纱线,选取它在编织体各个区域内合适的控制点,过这些控制点拟合成三次样条曲线,以此模拟纱线的空间结构中心线。最后得到纱线和编织体的结构。

Geometric Modeling of 4-Step 3-D Square Braid Architecture

Analyzing the mechanics properties of three-dimensional braided composites is based on learning their braid structure.For square braiding structures,a representative geometric model of unit cell is presented through studying the actual braiding process.It is composed of a series of yarns,the structure of which is formed when yarn carriers wind a full cycle and return back to the initial start position,such a model ensures continuity of yarn bunches and integrity of braided composite structure.For each yarn,control points are assigned properly in all regions of braided volume,then the cubic B-spline curves are constructed by passing these control points,forming the central axes of yarn spatial structure.Finally the structure of yarns and the braided cell is generated.