缝合预制件在RTM中的渗透性

Permeability of stitched preform in RTM

用径向技术测量了缝合预制件的渗透率,研究了缝针型号、缝合参数对渗透率的影响。实验结果表明渗透率随缝合密度和缝针直径的增加而增加,100号缝针且缝合密度低于0.66 pts/m2时除外;缝针和缝合线同时对渗透率起作用,缝针起促进作用,缝线起阻碍作用,与未缝合的织物相比,缝线的质量比仅占0.18%,渗透率增加58.6%。用一维流动技术测量了缝合和未缝合预制件的横向渗透率,研究了铺层方向与缝合密度对横向渗透率的影响,实验表明横向渗透率随缝合密度增加而显著提高。

The permeability of stitched preform was measured by the radial technology. The influences of the sewing needle and stitching parameters on the permeability were studied. The experimental results show that the permeability increases with increasing the stitching density and diameter of sewing needle except when the stitching density is lower than 0.66 pts/m^2 using 100 type sewing needle. The types of the sewing needle and thread affect the permeability simultaneously. The sewing needle plays a promoting role, while the thread plays a limiting role. With a thread mass fraction of 0.18%, the permeability is increased greatly by 58.6% with respect to the same unstitched fabric. Transverse permeabilities of stitched and unstitched fabrics were measured by one-dimensional flow experiments. The influences of the fiber stacking sequence and stitching density on the transverse permeability were studied. The experimental results show that the transverse permeability strongly increases with increasing the stitching density.