The tow-sliding defect also referred to as gapping that appears during complex shaping of woven reinforcements is due to a loss of cohesion in the fabric. The cohesion of the fabric tends to keep the tows from sliding under tension. This cohesion depends on the frictional behavior of the tows mainly. Other factors such as the weave of the fabric, the tensions and shear state of the fabric during forming play an important role as well. An analysis of the frictional behaviors of the tows coupled to out of plane pull-out tests to determine the influence the aforementioned parameters on the cohesion of the reinforcements was then carried out. It was showed that the cohesion of the fabric, limiting the risk of appearance of tow sliding defect, can be improved by increasing the transverse tow tension in low shear region, and by the in-plane shear itself in highly sheared zones.

拖曳滑动缺陷（也称为缝隙）出现在机织增强材料的复杂成型过程中，是由于织物内聚力的损失所致。织物的内聚力倾向于防止丝束在张力下滑动。这种内聚力主要取决于丝束的摩擦性能。其他因素，例如织物的编织，成形期间织物的张力和剪切状态也起着重要的作用。然后进行了与平面外拉拔试验相结合的丝束的摩擦性能分析，以确定上述参数对增强材料内聚力的影响。结果表明，通过增加低剪切区的横向丝束张力，可以改善织物的内聚力，从而限制丝束滑动缺陷出现的风险。