Tear behavior of PVC-coated fabric with crackhole defects
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(1.Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering(China University of Mining and Technology), Xuzhou 221116, Jiangsu, China; 2.School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China; 3.School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China)

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TU502+.6

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    Abstract:

    The hole at the joint and boundary is an important component of the membrane structures and plays a key role in connecting the relevant components. However, the stress concentration is easy at the edges of holes, which has a serious effect on tearing behavior of the coated fabric. To investigate the effect of holes in polyvinyl chloride (PVC) coated fabric on crack propagation behavior. Uniaxial tensile tests of PVC-coated fabric with cracks and holes were carried out. The whole process of tear propagation and tearing mechanism are analyzed. A prediction model for the tear strength of PVC-coated fabric with multiple defects is proposed and the applicability of the model is verified. The results show that there are two stages of crack-end expansion and hole-end re-expansion during the center tearing process of the PVC-coated fabric with cracks and holes. Four tear characteristic indicators are defined to measure the tear resistance of coated fabric with cracks and holes, namely, the critical tearing load at the crack-end and hole-end, the ultimate tearing load at the crack-end and hole-end. The existence of holes leads to the increase in the bearing capacity of the specimen at the re-expansion stage. However, with the size of the hole increasing, the bearing capacity enhancement effect of the hole-end weakens and the ultimate tearing load at the crack-end becomes the maximum tearing load. The proposed quadratic functionexponential function stress field model can effectively predict the critical tear stress at the crack-end and the critical tear stress at the hole-end of the coated fabric.

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History
  • Received:August 26,2022
  • Revised:
  • Adopted:
  • Online: May 06,2024
  • Published:
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