连接方式对叠层经编间隔织物压缩性能的影响

Effect of connection method on compression performance of laminated warp-knitted spacer fabric

为研究连接方式(双层直接叠加、线连接、胶黏合)及线连接方式中连接点密度对经编间隔织物压缩性能的影响,用万能材料试验机对双层间隔织物做平板压缩试验,得到应力应变曲线。可知在压缩线性阶段,连接方式和线连接点密度对织物压缩刚度影响极小;在屈服阶段,胶黏合的间隔织物抗压性能更好,线连接与直接叠加织物的压缩性能相近,不同连接点密度的织物随点密度增加,压缩更加不稳定。对直接叠加与胶黏合的织物进行仿真可知:模拟与试验结果误差在10%以内;位移变化均由上至下减小,线性阶段位移变化为5.96~8.94 mm,屈服阶段直接叠加与胶黏合织物的上层位移变化不同,下层位移变化相近,为8.9~11.9 mm;应力变化中,上下层间隔丝同时承压,应力远大于表面层;间隔丝中间及两端部位存在应力集中情况,随压缩的进行,应力集中区域应力值增大,线性阶段只有12~19 MPa,屈服阶段达到44.5~52.5 MPa,但胶黏合织物的应力集中区域面积大于直接叠加。

In order to study the effect of connection methods(double layer direct superposition,line connection,adhesive bonding)and the density of connection points on the compression properties of warp knitted spacer fabric,a universal material test machine is used to perform flat compression experiments on the double layer spacer fabric,and the stress-strain curve is obtained.It can be seen that in the compression linear stage,the connection mode and the density of line connection point have little influence on the compression stiffness of the fabric.In the yield stage,the adhesive spacer fabric has better compression performance,and the compression performance of the line connected fabric is similar to that of the directly stacked fabric.The fabric with different connection point density become more unstable in compression as the point density increases.Simulation of directly superposition and adhesive bonding shows that the error between simulation and experiment results is within 10%.The displacement changes decrease from top to bottom,with a linear displacement change of 5.96~8.94 mm.In the yield stage,the displacement change of the upper layer of the fabric with direct superposition and adhesive bonding is different,while the displacement change of the lower layer is similar,ranging from 8.9~11.9 mm.In the stress variation,the upper and lower spacer fiber are simultaneously under pressure,and the stress is much greater than that of the surface layer.There is stress concentration in the middle and both ends of the spacer fiber.As compression progresses,the stress value in the stress concentration area increases,with only 12~19 MPa in linear stage and 44.5~52.5 MPa in the yield stage.However,the stress concentration area of the bonded fabric is larger than that of the direct superposition.