期刊
FIBERS AND POLYMERS
卷 19, 期 12, 页码 2581-2589出版社
KOREAN FIBER SOC
DOI: 10.1007/s12221-018-8368-8
关键词
Flat weft knitted spacer composites; 3D Hollow core sandwich composite; Low velocity impact behavior; Damage; Failure mode
Impact failure of newly-designed textile composites from three-dimensional integrated weft-knitted spacer fabrics (3D-IWK-SF) was aimed to be investigated under drop weight loading. Using a computerized flat knitting machine, three different 3D-IWK-SF as the composite reinforcements varied in their cross-sectional shapes, were produced from E-glass yarns. The produced fabrics were then impregnated with unsaturated polyester resin via the vacuum assisted resin transfer molding (VARTM) which eventually results in 3D integrated spacer weft-knitted sandwich composites (3D-IWK-SC). For comparing the results, an additional core/sheet sandwich composite composed of the same sheet and the polyurethane foam core was also fabricated. From the resulted values of contact force, it was concluded that 3D-IWK-SC of V-shaped crosssection had the highest resistance against low velocity impact load. On the other hand, the evaluated damaged area of both Vshaped 3D-IWK-SC and the foam core sandwich composites were lower than the other samples. Moreover, it was observed that matrix crack-formation in face-sheets of all samples as well as transversely propagated cracks at the connecting layers of 3D-IWK-SCs were of dominant failure modes under drop weight impact test, while no sign of face-core de-bonding were observed for all type of 3D-IWK-SCs.
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