Efficient Poisson’s Ratio Evaluation of Weft-Knitted Auxetic Metamaterials

Auxetic metamaterials expand transversely when stretched longitudinally or contract compressed, resulting in a negative Poisson’s ratio (NPR). fabrics are 3D textile possessing unique geometry that can generate an auxetic response with respect to tension. In weft-knitted fabrics, the NPR property is achieved due inherent curling effect of face and back stitches knit loops; they organized knitting pattern. The traditional method used evaluate measure lateral fabric deformation during axial tensile testing on mechanical machine, which time-consuming inaccurate measuring uneven deformations. this study, efficient was developed also estimate directionality. elasticity extension properties be analyzed immediately following removal from bed. Five all same stitch densities (including four patterns one single jersey pattern), were designed produced validate proposed method. use our estimation such showed higher values compared conclusion, directionality, elasticity, extensionality examined. It anticipated could assist innovative development deployment knitted metamaterials.