【摘要】 为了提高复合材料T型加筋壁板中筋条与蒙皮的连接强度,引入缝合增强技术。利用自主研发的弯针缝合机器,并通过真空辅助树脂灌注技术(VARI)制备缝合T型接头试样,并对其进行拉伸实验,研究缝合对T型接头界面增强机理及不同缝合密度、缝线细度对T型接头拉伸性能的影响规律。结果表明:缝合细度为1000 D,缝合密度在0～10×10范围内,缝合增强T型接头拉伸极限载荷随缝合密度的增加而增加,缝合密度为10×10的缝合增强T型接头比未缝合接头极限载荷提高了38%,缝合密度在10×10～-8×8范围内,缝合T型接头拉伸极限载荷呈下降趋势;缝合密度为10×10,缝线细度在0～1000 D范围内,缝合T型接头拉伸承载力随缝线的增粗而增加,缝线细度增加至1500 D时,T型接头拉伸极限载荷呈下降趋势。缝合密度和缝线细度的变化对T型接头初始失效载荷影响不显著。更多还原

【Abstract】 In order to improve the joint strength between the ribs and the skin in the T-reinforced wall panel of the composite material, stitching reinforcement technique is introduced. The self-developed curved needle sewing machine is used to prepare the suture T-joint sample by vacuum assisted resin infusion technique(VARI), and the tensile test is carried out to study the interface strengthening mechanism of the T-joint and the influence of stitch density and stitch fineness on the tensile properties of T-joint. The results showed that when stitching fineness is 1000 D and the stitching density is in the range of 0-10×10, the tensile limit load of the suture-reinforced T-joint increased with the increase of the stitching density. The ultimate load of stitched reinforced T-joints with stitch density of 10×10 is 38% higher than that of unstitched joints. The ultimate tensile load of stitched T-joints tends to decrease in the range of stitching density of 10×10-8×8. When the stitching density is 10×10, and the stitch fineness is in the range of 0-1000 D,the tensile load-carrying capacity of the T-joint increases with the thickening of the suture, and the tensile limit load of the T-joint decreases when the stitch fineness increases to 1500 D. The change in stitch density and seam fineness has no significant effect on the initial failure load of the T-joint.更多还原