Page 163 - 3D Fibre Reinforced Polymer Composites

152 30 Fibre Reinforced Polymer Composites

Table 7.2 Tensile properties of E-gladepoxy warp knit composites with varying knit
architecture. Fibre volume fraction = 40% (from Huysmans et al., 1996)
Tricot Tissue 1 Tissue 2 Tissue 3 Satin
Strength (MPa) wale 100 100 120 100 230
course 195 120 230 250 170
Stiffness (GPa) wale 10 11 11 10 16
13
course 13 10 15 15 -

Figure 7.5 Illustration of warp knit a) denbigh, b) 1x3 single cord, and c) 1x4 single
cord architectures

The tensile properties of knitted composites can also be affected by controlling
parameters, such as loop length or stitch density, within a knit architecture. Loop length
and stitch density are inter-related as an increase in the number of stitches (or knit
loops) per unit area will require a decrease in the length of the knit loop. Leong et al.
(2000) and Anwar et al. (1997) presented data that described the effect of varying loop