Slippage coefficient measurement for non-geodesic filament-winding process

In order to calculate the winding patterns for non-geodesic filament wound products, the slippage coefficient, which represents the frictional force between the fiber tows and the mandrel surface, was introduced to find the region of possible winding patterns. This research aims to establish a method to measure the slippage coefficient. A special mandrel was proposed that has a designed meridian profile that enables a linearly proportional relation between the cross-sectional radius and the measured values of the slippage coefficient. With this mandrel, several experiments were performed corresponding to the variation of the typical filament-winding process parameters. The results indicate that the bandwidth and resin viscosity had a considerable influence on the obtained data. In contrast, the influence of the filament-winding speed and the roving tension were negligible. The results also show that the approach provides high accuracy, repeatability, low cost and simple machine control.