Abstract: In order to study the stab-resistant properties of multi-axial warp-knitted fabrics, quasic-static stab tests of multi-axial warp-knitted fabrics in different specifications were conducted. The experimental results were analyzed to research the influence made by the structural parameters of multi-axial warp-knitted fabrics on the stab resistance, and the stab-resistant characteristics of the multi-axial warp-knitted fabrics. Besides, cross section morphologies of the fibers around the fracture rent of the multi-axial warp-knitted fabrics were observed via SEM while puncturing, to analyze the mechanism of energy absorption of multi-axial warp-knitted fabrics during the stab-resistant process. The results showed that the volume mass of the multi-axial warp-knitted fabric was positively related to the maximum penetration force, the maximum penetration force increased as the volume mass increased. Also the increase of the surface density of the multi-axial warp-knitted fabrics was propitious to enhance the stab resistance of the fabrics. The four-axial warp-knitted fabrics made of finer yarns would have the best stab resistance, which could better absorb the penetration energy and resist the shearing of blades.

Key words: multi-axial warp knitted fabric , glass fiber , shear thickening fiuid , quasi-static , stab resistance