Off-axis central tearing behaviors and damage mechanisms of warp-knitted fabric membranes

doi:10.19936/j.cnki.2096-8000.20220528.004

Abstract

Abstract: In order to explore the central tearing behaviors and damage mechanisms of biaxial warp-knitted fabric membranes, series of uniaxial central tearing tests for seven off-axis angles, including 0°, 15°, 30°, 45°, 60°, 75°, and 90°, and the development of microscopic numerical models were performed on a typical PVDF warp-knitted fabric. The variations of failure morphologies and tearing strengths of warp-knitted fabric membranes with the increase of off-axis angles were systematically analyzed. And combined with experimental and numerical results, the effects of off-axis angles on tearing strength and the micro-level load-carrying capacity and deformation mechanisms of yarns were further discussed. The results show that the yarn orientation of warp-knitted fabric has a significant effect on the direction of slit propagation and opening shape. As off-axis angles increase, a “W” shaped relationship between critical tearing strength, ultimate tearing strength and off-axis angle is presented, and an inverted “V” shaped relationship between ruptured displacement, failure displacement and off-axis angle is revealed. The yarn orientation of warp-knitted fabric also has a significant influence on the range of stress concentration and stress distribution. For 45° off-axis specimen, numerical simulation exhibits that the stress distribution is more uniform and the deformation is more sufficient than those of other off-axis angles. Therefore, 45° off-axis angle shows the largest tearing strength and is considered as the optimal load-carrying scheme. The conclusion could offer useful reference for the analysis of local crack arrest and safety assessment of architectural membrane structures.

Key words: warp-knitted fabrics, central tearing, off-axis angles, failure morphology, strength, finite element analysis, composites

CLC Number:

TB332

ZHANG Ruo-nan, CHEN Jian-wen. Off-axis central tearing behaviors and damage mechanisms of warp-knitted fabric membranes[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(5): 28-36.

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