Characterization of negative Poisson’s ratio of two/three dimensional auxetic knitted fabric with PET/PA/cotton from folded structures

AbstractNegative Poisson’s ratio tubular fabric plays an important role in mechanical and medical fields. To explore the impact of different raw materials and different structures on the negative Poisson’s ratio effect, flat knitting technology was used to characterize the negative Poisson’s ratio of three different structures of sheet and tubular fabrics made from polyester, cotton, and nylon. The tensile test and static burst test were applied to compare the performance of various sheet-knitted fabrics. The results show that yarn with better elasticity and elongation have a better auxetic effect. Fabrics with good auxetic effects have greater deflection and better energy absorption capacity. When measuring the longitudinal length variation of tubular knitted fabrics using cylinders of different diameters, it was found that when the number of weave cycles in a circle of tubular knitted fabrics is few, the negative Poisson’s ratio effect of tubular knitted fabrics is better than that of sheet knitted fabrics.Keywords: Negative Poisson’s ratioauxetic effectflat knittingmechanical propertiesenergy absorption Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThe authors acknowledge the financial support from the National Science Funds of China (11972172), the Fundamental Research Funds for the Central Universities (JUSRP62005), and a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAP).