Journal
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
Volume 41, Issue 1-2, Pages 3-19Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/07316844211020499
Keywords
Mechanical properties; coated biaxial warp-knitted fabrics; off-axial tensile test; biaxial tensile test; creep test; linear orthotropic material model
Categories
Funding
- National Natural Science Foundation of China [51778458]
- China National Electric Apparatus Research Institute Co., Ltd.
- Shanghai Seman Trading Co., Ltd China
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This article comprehensively investigates the mechanical properties of coated biaxial warp-knitted fabrics, including tensile strength, failure modes, creep elongation, tearing strength, and elastic constants. Experimental data offer a deeper and comprehensive understanding of the performance of these fabrics, which can be conveniently adopted in structural design.
In recent years, coated fabrics have become the major material used in membrane structures. Due to the special structure of base layer and mechanical properties, coated biaxial warp-knitted fabrics are increasingly applied in pneumatic structures. In this article, the mechanical properties of coated biaxial warp-knitted fabrics are investigated comprehensively. First, off-axial tensile tests are carried out in seven in-plane directions: 0 degrees, 15 degrees, 30 degrees, 45 degrees, 60 degrees, 75 degrees, and 90 degrees. Based on the stress-strain relationship, tensile strengths are obtained and failure modes are studied. The adaptability of Tsai-Hill criterion is analyzed. Then, the uniaxial tensile creep test is performed under 24-h sustained load and the creep elongation is calculated. Besides, tearing strengths in warp and weft directions are obtained by tearing tests. Finally, the biaxial tensile tests under five different load ratios of 1:1, 2:1, 1:2, 1:0, and 0:1 are carried out, and the elastic constants and Poisson's ratio are calculated using the least squares method based on linear orthotropic assumption. Moreover, biaxial specimens under four load ratios of 3:1, 1:3, 5:1, and 1:5 are further tensile tested to verify the adaptability of linear orthotropic model. These experimental data offer a deeper and comprehensive understanding of mechanical properties of coated biaxial warp-knitted fabrics and could be conveniently adopted in structural design.
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