Stab

Abstract: This paper reports the stab failure behaviors of coated and uncoated woven fabric in experimental and finite element analysis (FEA) approaches. In the experimental approach, the quasi-static stab behaviors of both the fabrics under the penetration of a rigid penetrator were tested to obtain the load–displacement curves. The stab failure morphologies were also observed and photographed to show the stab damage modes. In particular, the load–displacement curves were compared to find the difference between the coated and uncoated woven fabrics during stab penetration. In the FEA, microstructure geometrical models of both the fabrics were established to calculate the developments of stab damages. The influences of structure parameters of the fabrics on the stab resistance were discussed and the differences of the stab strengths between the two fabrics were also compared. From the FEA results, the development of stab damage could be visually displayed. With the visual results, it will be helpful to analyze the ...

Abstract: Stronger and lighter stab resistance materials are always among the relentless pursuits of scientists and engineers. This study presents a featured perspective on investigating the influence of distribution and quantity of shear thickening fluid (STF) on the stab resistance performance and weight of STF/Kevlar (SK) fabrics. A series of tests confirmed that the peak stab resistance force was 515.48 N (±18.62) because of the uniform distribution of SiO2 nanoparticles in Kevlar fabrics, behaving 2.07 fold than that of the neat Kevlar (NK) fabrics, and the weight gain rate was only 17.1% (±0.56) under the optimal technology condition, almost displaying the theoretical values. Moreover, the added STF had a negligible influence on flexibility of NK fabric. The pull-out test demonstrated that the high inter-yarn friction of SK fabric could strengthen the resistance relative motion of yarns so that more surrounding yarns participated in the impact energy dissipation and maximized the role of high-performance fabric Kevlar.

Abstract: Flexible woven composites have been widely used in geotextiles and light weight building structures. The stab resistance behavior of the flexible woven composite is an important factor for the application design. This paper reports an analytical model for predicting stab resistance of flexible woven composites under perpendicular stab with a blunt steel penetrator. The analytical model was established based on the microstructure and the deformation shape of the flexible woven composite under normal penetration. During the quasi-static stab penetration, the strain energies of warp and weft yarns and resins have been calculated. The stab resistance was calculated from the strain energies of the flexible woven composite. Furthermore, the contributions of the warp and weft yarns, resins to the stab resistance have been analyzed. It was found the three constituents have near the same contribution to the stab resistance. The higher value of weaving density, strength of yarns and especially the higher strength coating resins will lead the higher stab resistance. With the analytical model, the stab resistance would be expected to be designed in an efficient way with an acceptable precision.