Abstract
In this study, we fabricated para-aramid flexible angle-ply-laminated hybrid composites based on weft-knitted reinforcements. Here, four kinds of weft-knitted reinforcements with rib, interlock, punto di roma, and two-thread fleecy were prepared using para-aramid spun yarn. They were then compounded with silicone rubber and waterborne polyurethane–acrylate using the coating method. The layers were angle-plied to produce stab-resistant, weft-knitting-reinforced, flexible laminated hybrid composites. Tensile and tearing strengths of the para-aramid-knitted reinforcements were investigated. Relevant response analyses were chosen to evaluate the influence of three independent variables, including weft-knitted structures, matrix types, and ply orientations. The results showed that the mechanical properties of the composites were dependent on weft-knitted structures and matrix types. The fabric with high strength and the degree in approximate isotropy of stress in all composites was most suited for the reinforcement of the flexible stab-resistant composite. The optimum design with the best stab-resistant property was punto di roma/waterborne polyurethane–acrylate with a ply orientation angle of [0°/0°/0°/0°]. The interlaminar adhesion of flexible stab-resistant composite based on waterborne polyurethane–acrylate can be improved by increasing the surface roughness of fabric structure or modifying its surface.
Highlights
Increased international and domestic travel and increasingly frequent incidences in global terrorist attacks, have increased demand for protective clothing
Four kinds of contrasting weft-knitted reinforcements with rib, interlock, punto di roma, and twothread fleecy were prepared by para-aramid spun yarn to fabricate reinforcement
Para-aramid spun yarns were fabricated into four kinds of weft-knitted structures using a CMS 530HP flat knitting machine (Gauge 14, STOLL, Germany) and prepared for reinforcements
Summary
Increased international and domestic travel and increasingly frequent incidences in global terrorist attacks, have increased demand for protective clothing. Four kinds of contrasting weft-knitted reinforcements with rib, interlock, punto di roma, and twothread fleecy were prepared by para-aramid spun yarn to fabricate reinforcement. Para-aramid spun yarns were fabricated into four kinds of weft-knitted structures (rib, interlock, punto di roma, and two-thread fleecy) using a CMS 530HP flat knitting machine (Gauge 14, STOLL, Germany) and prepared for reinforcements. 63 58 57 63 58 57 48 of flexible angle-ply-laminated hybrid composites and four weft-knitted structures.
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