Effect of connection method on compression performance of laminated warp-knitted spacer fabric
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.
warp-knittedspacer fabriclaminationfinite element analysismattresscompression performance
NETL
NSTL
万方数据
