Abstract: Woven fabric reinforcing layer is the pressure bearing framework material of lay-flat hose. During the stretching process of woven fabric, the mechanical efficiency of yarn will be reduced due to the stress concentration of warp and weft yarn at the intersection, resulting in the decrease of pressure bearing strength of lay-flat hose. Therefore, in this paper, firstly, the tensile properties of ring knitted twill fabric are studied by finite element tensile simulation and tensile test. Then, aiming at the problem of stress concentration at the intersection in the tensile process of woven fabric, the tensile process of twill fabric with different warp spacing and weft fineness is simulated by finite element simulation, and the stress distribution and stress concentration factor of yarn cross section at the intersection are calculated. The results show that the results of finite element tensile simulation are basically consistent with those of tensile test. Increasing the warp spacing, reducing the weft fineness and weft curl curvature can reduce the stress concentration at the intersection in the process of weft stretching, while the warp spacing, weft fineness and weft curl have no significant effect on the stress concentration at the intersection in the process of weft stretching.

Key words: fabrics, stress concentration, finite element analysis, lay-flat hose, structure, composite material