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The Study on the Mechanical Properties of Architectural Membrane Materials

Author: ZouZongYong
Tutor: HanJian
School: Zhejiang University of Technology
Course: Textile Engineering
Keywords: Architectural membrane material Extrude Anisotropic Orthotropic plate theory of elasticity Tear Creep
CLC: TB383.2
Type: Master's thesis
Year: 2010
Downloads: 136
Quote: 0
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Abstract


With the development and wide application of the membrane structure, architectural membrane material more and more worldwide attention as a new type of building materials. Its application more widely, so the study of the mechanical properties is also growing concern. Membrane structure engineering membranes used generally by the substrate, the coating, the surface layer composed of glass fiber woven fabric with the polyester fiber woven fabric in a common substrate, and the coating of polyvinyl chloride (PVC) and polytetrafluoroethylene ( PTFE). Substrate organizations generally use plain weaving process is relatively simple, the most widely used. Easy due to the membrane during use by the tensile, tear and creep three reasons caused the destruction, so this issue is building PVC and PVDF membrane material, respectively, of its tensile, tear and creep properties research and analysis. The main contents and results are as follows: 1. Different criteria under the membrane tensile properties, the tensile properties of the different membranes and membrane tensile properties of anisotropic. The results show that: the membrane under standard ASTM4851 fracture strength and fracture elongation, the lowest in the standard JIS-L1096, remaining centered; the Ferrari FLUOTOP? T2 1002 membranes warp and weft isotropic than a domestic manufacturers of PVDF The membrane material is better; better predict the tensile properties of the membrane was typical orthotropic elasticity theory of orthotropic plate the initial modulus membranes in different directions. 2. Study the performance and mechanism of the tearing of the membrane under different criteria focus on studies the raphe tearing method of initial crack length and direction of their tear properties. The results show that: the complex double tongue tear compared trapezoid tearing method tearing mode is mainly longitudinal yarn elongation deformation, transverse yarn by shear stress, tensile stress and from the binding force of the longitudinal yarn together lead to a breach of trapezoid tear rule mainly tear triangle extended destruction; raphe tearing method of initial crack length and direction of the tear strength of greater impact, with the increase in initial crack length, specimen tear strength of a linear decrease, as the angle increases, the slowdown in the downward trend of the two failure modes (brittle fracture mode and cracks extended failure mode) related to the cut off the number of yarns and the actual crack, the crack is smaller was Brittle fracture, large cracks were the cracks extend destroyed. 3 samples by zonal creep performance in the four load levels, creep recovery after tensile properties and under the same load level on the direction of the membrane seven surface creep properties were studied. The results show that: the sample by the zonal creep performance and load load, creep time, their respective strain can be expressed as a logarithmic function time; the sample creep tensile properties than creep before larger differences, mainly in the stress strengthening phase, with the improvement of the creep load level, the stage of the modulus increased to varying degrees; creep properties of the sample showed significant anisotropy, creep curves can also be used to strain - on time logarithmic function creep properties of the sample in different directions are quite different, the specimen in the direction of the off-axis creep resistance decreased significantly compared to the warp and weft, 45 ° direction specimens creep resistance worst.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
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