The formation and performance of auxetic textiles. Part II: geometry and structural properties

A novel plied yarn structure with negative Poisson’s ratio

“…Auxetic textiles include auxetic fibers (Alderson, Alderson, Smart, Simkins, & Davies, 2002;Ravirala, Alderson, Davies, Simkins, & Alderson, 2006), auxetic yarns (Evans, Sloan, Wright, & Burns, 2010;Hook, 2011;Lee, Lee, Koh, & Heo, 2011), and auxetic fabrics (Alderson et al, 2012;Ge, Hu, & Liu, 2013;Hu, Wang, & Liu, 2011;Liu, Hu, Lam, & Liu, 2010;Ugbolue et al, 2010;Ugbolue et al, 2011;Wang & Hu, 2014b;Wang, Hu, & Xiao, 2014). Among various auxetic textile materials which have been developed up to now, helical auxetic yarn structure (Hook, 2011) invented by Hook Patrick has demonstrated a great interest for practical applications.…”

Engineered Warp Knit Auxetic Fabrics

“…The conventional materials have positive Poisson's ratio whereas auxetic materials have negative Poisson's ratio. Ugbolue et al [21,22] have discussed in detail the behavior of warp knit auxetic structures fabricated with non-auxetic filaments. In this study the Poisson's ratio results of all the samples for the non-auxetic structure (no inlay yarn) are shown in In order to study the influence of various inlaying types on the Poisson's ratio, both structures A and B were tested in two directions.…”

Geometrical Analysis of Warp Knit Auxetic Fabrics

“…As was proposed by Ugbolue et al [3,4] to achieve auxetic property, Based on prior presented dependences, the lengths of elastomeric yarn, which are not fixed in the structure, are given as follows:…”

“…In recent years, considerable interests have been shown on the formation, properties and characteristics of auxetic knit structures [1][2][3][4][5][6][7]. Auxetic structures can enable an article to exhibit an expansion in a lateral direction, upon subjecting the article to a longitudinal stress or strain.…”