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Comprehensive study on mechanical properties of coated biaxial warp-knitted fabrics
Journal of Reinforced Plastics and Composites ( IF 2.3 ) Pub Date : 2021-05-22 , DOI: 10.1177/07316844211020499
Bin Yang 1 , Yingying Shang 1 , Zeliang Yu 1 , Minger Wu 1 , Youji Tao 2 , Jiaxiang Qin 2
Affiliation  

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°, 15°, 30°, 45°, 60°, 75°, and 90°. 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.



中文翻译:

涂层双轴经编织物力学性能的综合研究

近年来,涂层织物已成为用于膜结构的主要材料。由于基层的特殊结构和机械性能,涂层双轴经编织物越来越多地应用于气动结构中。本文对涂层双轴经编织物的力学性能进行了全面的研究。首先,在七个平面内方向上进行离轴拉伸测试:0°,15°,30°,45°,60°,75°和90°。基于应力-应变关系,获得抗拉强度并研究破坏模式。分析了蔡-希尔准则的适应性。然后,在24小时持续载荷下进行单轴拉伸蠕变试验,并计算出蠕变伸长率。此外,通过撕裂试验获得经向和纬向的撕裂强度。最后,分别在1:1、2:1、1:2、1:0和0:1的5种不同的载荷比下进行双轴拉伸试验,并基于最小二乘法计算弹性常数和泊松比线性正交各向异性假设。此外,进一步对4:3、1:3、5:1和1:5的四个载荷比下的双轴试样进行拉伸测试,以验证线性正交各向异性模型的适应性。这些实验数据提供了对涂层双轴经编织物机械性能的更深入而全面的理解,可方便地用于结构设计中。在4:3、1、3、5:1和1:5的四个负载比下对双轴试样进行进一步拉伸测试,以验证线性正交各向异性模型的适应性。这些实验数据提供了对涂层双轴经编织物机械性能的更深入而全面的理解,可方便地用于结构设计中。在4:3、1、3、5:1和1:5的四个负载比下对双轴试样进行进一步拉伸测试,以验证线性正交各向异性模型的适应性。这些实验数据提供了对涂层双轴经编织物机械性能的更深入而全面的理解,可方便地用于结构设计中。

更新日期:2021-05-22
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