Review on the knitted structures with auxetic effect

There are now different kinds of geometrical models for auxetic materials, such as re-entrant model, rotating model, nodule and fibril model, chiral model, liquid crystalline model, helical model and rod model for describing the angle-ply composites. Knitting technology, including plane and 3D warp knitting as well as weft knitting, is widely used in the manufacturing fields nowadays and has been adopted in fabric structure designing. Knitted fabrics with negative Poisson’s ratio have great potentials in both apparel and industries. The present article reviews the auxetic principles in general and in the specific context of knitted textile structures with auxetic potential made from conventional fibers.