122-129Tensile properties
tests of three kinds of multi-axial warp-knitted fabric, namely triaxial
fabrics (-45o/90o /+45o and
-45o /0o /+45o) and quadraxial fabric (-45o
/90o /+45o /0o) have been studied along the
orientations of 0o, 45o and 90o.
Stress-strain curves are obtained. The whole tension processing has been
observed through high-speed camera and the series of images is picked up to
analyze the meso-scale mechanism of the extension and displacement of tows on
oriented layers. The results indicate that the tensile properties of MWK fabric
are closely related to the orientations of the layers, and stitching yarns
incarnate significant effects on deformation procedures of fabrics