Journal of South China University of Technology (Natural Science Edition) ›› 2021, Vol. 49 ›› Issue (10): 78-86.doi: 10.12141/j.issn.1000-565X.200511

Special Issue: 2021年土木建筑工程

• Architecture & Civil Engineering • Previous Articles     Next Articles

Biaxial Tearing Behaviors and Mechanisms of Warp-Knitted Fabric Membranes Under Combined Shear and Tensile Stresses

CHEN Jianwen1 GUAN Xiaoyu1 ZHANG Ｒuonan1 XIA Yufan1 CHEN Wujun2 WANG Mingyang3   

  1. 1． School of Science，Nanjing University of Science and Technology，Nanjing 210094，Jiangsu，China; 2． Space Structures Ｒesearch Center ( SSＲC) ，Shanghai Jiao Tong University，Shanghai 200030，China; 3． Engineering Institute of Corps of Engineers，Army Engineering University of PLA，Nanjing 210007，Jiangsu，China
  • Received:2020-08-25 Revised:2021-03-05 Online:2021-10-25 Published:2021-09-30
  • Contact: 陈建稳 ( 1981-) ，男，博士，副教授，主要从事轻型建筑膜结构、浮空器膜结构及材料性能研究。 E-mail:Jianwench@yeah.net
  • About author:陈建稳 ( 1981-) ，男，博士，副教授，主要从事轻型建筑膜结构、浮空器膜结构及材料性能研究。
  • Supported by:
    Supported by the National Natural Science Foundation of China ( 51608270) ; the Fundamental Ｒesearch Program of Jiangsu Province ( BK20191290) ; the Fundamental Ｒesearch Funds for the Central Universities ( 30920021143) ; the China Postdoctoral Science Foundation ( 2017T100371 and 2016M601816)

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Abstract: In order to explore the in-plane tearing behaviors and strength characters of fabric membranes under combined shear and tensile stresses，experimental and mesoscale numerical studies were conducted on a typical warp-knitted fabric membrane． Its specific tearing behaviors and strength characters under a series of stress ratios and stress levels，reinforced film types and coupled stresses were obtained，and the tearing mechanisms and failure behaviors of the material affected by shear-tension coupling stresses were analyzed． Ｒesults show that the fabric membranes could produce three kinds of appearance in terms of the orientation of the tear: line-shaped，crossshaped，and Z-shaped opening，which is depended on the crack orientation and stress states imposed on them，and the corresponding damage directions of yarns could belong to either warp or weft mode，instead of mixed modes． The stress states in warp and weft directions show the synergistic effect to offer the resistance to tear propagation， which affects the tearing strength obviously and leads to significant differences of tearing strength curves for different crack parameters in the stress space，resulting in the occurrence of stress strengthening at the stress ratio 1∶ 1． The stress state combined with reinforced film can obviously interfere with the tearing damage modes and crack position of membrane material，and the reinforcing effect varies depending on the stress ratios． In addition，during the tearing process，there is a coupling relationship between the tensile and shear stresses，and the tensile stress effect is the main one，while the shear stress has no obvious effect on the crack propagation and evolution． The research findings could provide references for the localized crack arresting of fabric membrane materials and safety assessment of membrane structures．

Key words: warp-knitted fabrics, tear, numerical model, shear, shear-tension coupling, strength

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