Abstract:

In order to simulate the trajectory of the free-end fiber during the air flow twisting process of jet vortex spinning, the finite element model of the fiber was established based on the elastic thin rod element, combined with the moving characteristics of the flexible free-end fiber. According to the air pressure and velocity distribution in the airflow twisting chamber of jet vortex spinning, the finite element kinetic differential equation of the free-end fiber was established. Then following the principle of mechanical equilibrium, energy conservation, mass conservation and momentum conservation, the undetermined coefficients of the finite element kinetic differential equation of the free-end fiber was analyzed. Then based on the numerical simulation, the trajectory of the free-end fiber was acquired. Finally, the theoretical result of the free-end fiber trajectory by finite element simulating was tested by the tracer fiber method. The results show that the finite element model based on the elastic thin rod element is feasible and effective for simulatin fiber trajectory in jet vortex spinning.

Key words: jet vortex spinning, flow field characteristic, finite element model, trajectory of fiber