基于TexGen的筒状纬编针织物的三维仿真

3D Simulation of Tubular Weft-Knitted Fabric Based on TexGen

为建立筒状纬编针织物三维几何模型,突出其立体感,以传统的二维Pierce线圈模型作为织物在其厚度方向上的投影,利用几何关系得到能描述纬编针织物纱线形态的15个节点及其二维坐标值的计算方法,再将织物厚度方向扩展为节点坐标的第三维度,根据节点位置的不同得到其三维坐标值,基于这些节点在TexGen软件中使用Bezier样条曲线建立织物的纱线轨迹,再以指定的纱线横截面形状扫掠轨迹,建立通用的筒状纬编针织物三维模型。模拟结果较好地表现了线圈的相互串套关系和织物的空间形态,且能为后续的有限元分析提供前处理工作。

A three-dimensional geometric model of tubular weft-knitted fabric has been established to highlight its dimensional effect. The traditional two-dimensional Pierce’s loop model was used as the projection of the fabric in its thickness direction. 15 nodes describing the yarn shape of weft-knitted fabric and the calculation method of their two-dimensional coordinates were obtained based on the geometric relationship. The thickness direction of fabric is extended as the third dimension of every node, and the three-dimensional coordinate values of node was obtained according to the different positions of the nodes. The yarn trajectory of the fabric was established with Bezier spline curve in TexGen software based on these nodes, and then the general three-dimensional model of tubular weft knitted fabric is established by sweeping the trajectory with the specified yarn cross-section shape. The simulation results reflect the interlacing of coils and spatial form of fabrics well, and can provide pretreatment for the subsequent finite element analysis.