Preparation And Mechanical Properties Of Double-layer Woven Spacer Yarn Fabric Composite Sheet

Woven spacer fabric with double layers is a kind of three-dimensional woven fabric with special structure,and one of its potential application fields is reinforced material of textile composite fan blades.According to the special performance requirements of fan blade for reinforcing material,basalt filament and aramid fiber were chosen as basic raw materials.In the course of trial weaving,the problems of weaving such as warp hair,breaking were encountered,for this reason,the basalt filament/polypropylene filament wrapped yarn was spun by independent innovation design for surface weaving,and the aramid yarn was chosen as the connecting yarn,the plain weave was chosen as the base weave for surface and interconnecting structure.The influencing factors of the fabric structure of double woven spacer yarn were discussed,and the TexGen software was used to simulate the structure of the double-layer spacer fabric,thus the weaving technology of the whole set of double-layer woven spacer fabric was formed,which has done a lot of basic work for developing multi-layer woven spacer yarn fabric.Under the limited experimental conditions,several kinds of preforms with different fineness of warp yarn and different density of surface layers were made.The filling mold of two-layer woven spacer fabric was designed and processed with 316 stainless steel,the rigid polyurethane foam was used to fill the preform.The composites were prepared by hand pasting method after filling,and the flat compressive,side compressive,bending,low-velocity impact properties and compressive properties after impact of the composite panels were studied,the influence of different structural parameters on mechanical properties of composites was analyzed from macroscopic point of view.At the same time,the flat compressive,side compressive and bending property was simulated based on finite element software ABAQUS.The experimental results show that using basalt filament wrapped yarn and aramid short fiber yarn,the weaving of woven spacer fabric with double layers can be realized.When the core yarn fineness is 100tex and 264tex,the two kinds of basalt filament/polypropylene wrapped yarn have good comprehensive performances at 300 twist/m and 200 twist/m respectively,the surface of the wrapped yarn is smooth and coated evenly,and both can be used for surface weaving.Test results of mechanical properties of composite materials show that as the fineness of warp yarn increases,the flat compressive strength and compressive elastic modulus have no obvious difference,while the performance of side compressive and bending capacity increase,and the damage degree of the upper and lower panel decreases gradually after impact.With the increase of the density of surface layers,the compressive strength,warp bending ability and impact resistance of the composite plate decrease,and after different impact energy,the specifications of plates are damaged in different degrees,but the damage range is small,and no obvious stratification appears.Also,with the increase of impact energy,the time reaching maximum impact load decrease.The side compressive strength of the composite material attenuates in varying degrees after the impact of different energy,and with the increase of impact energy,the residual side compressive strength decreases gradually.By comparing the experimental results with the finite element simulation results,the rationality of the model was verified and this will lay a foundation for optimizing the mechanical properties of basalt filament yarn/aramid fiber spacer fabric reinforced composites in the future.