Study on the Shear Deformation Property of Warp-knit Fabrics

Abstract

The shear deformation property of two-bar tricot fabrics is analyzed, and the theory for calculating this property is dereloped by using a structural model. A unit structure of the model is constructed of three arcs of front-bar yarn and three arcs of back-bar yarn, and these arcs are stretched under shear deformation. This theory covers the general shear defor mation of fabrics, for example, simple shear deformation, shear deformation under biaxial tensile deformation.

The Mechanical Behaviour of Single-tricot Warp-knitted Fabrics Part I: An Experimental Investigation of Knitted Fabrics of Varying Loop Geometry under Tensile Stress with Special Attention Given to Inter-yarn Friction

“…The basic loop pattern of this class of structures is inherently asymmetrical (see Fig. 1) and thus very likely to exhibit substantial yam slippage during deformation, unlike many of the more sophisticated warpknitted fabrics, such as the double-bar tricot fabrics examined by Grosberg (I960), Yanagawa and Kawabata (1974). Yanagawa et al (1972Yanagawa et al ( .1973, Wu et al (1993) (see their Fig.…”

“…Grosberg (1960Grosberg ( .1964. Munden and Wheatley (1971), Yanagawa and Kawabata (1974). Yanagawa et al (1970fl.ib,r,l971,1972Yanagawa et al (1970fl.ib,r,l971, ,1973, Dhingra and Postle (1979).…”

“…Yanagawa and Kawabata (1974) and Yanagawa et al (l970«,/7,c,1971Yanagawa et al (l970«,/7,c, .1972 looked at the macroscopic biaxial load-extension behaviour of various knitted structures and also examined the shape of the single loop. However, their approach was considered not applicable to technical applications (such as resintransfer moulding (RTM)) in later publications (Wu el al.. 1993).…”