外套管状机织物抽拔过程的动态数值模拟

Dynamic Numerical Simulation of Pulling-out Process of Tubular Woven Fabric

运用有限元分析法对管状机织物外套于管子时的抽拔过程进行了应力应变分布动态模拟和计算。结果表明基于所建立的管状机织物三维模型,在考虑了经纬纱本身结构非线性关系及管子与织物接触的非线性条件下,所得管状机织物的应力、应变分布及其最大值与常理性应力、应变分布基本一致,应力和应变的最大值发生点完全一致。同时管织物的接触长度对最大应力和应变值及其发生位置有明显影响,且接触长度增加会导致自锁。这为管织物抽拔自锁和破坏预估计提供了有效的预报方法。

Using the finite element analysis method, the dynamic simulation and calculation of the stress and strain distribution for the pulling-out process of tubular woven fabric impact on pipe were studied. The results showed that based on the three-dimensional model of tubular woven fabric, the stress and strain distribution and the maximum points of stress and strain were consistent with general conception under the consideration of the nonlinear relationship between warp and weft and between tube and fabric. The max- imum stress and strain exactly occurred at the same point. The contact length of tube fabric had obvious effects on maximum stress and strain value and its positiorL The increase of contact length could cause fabric selblocking. It could provide effective prediction method for the tube fabric self-locking and damage pre-evaluation of pull-out process.