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A kind of biaxial shear test method of fabric membrane material

A test method and technology for fabric membranes, which are applied in the application of repetitive force/pulsation force to test the strength of materials, measuring devices, analyzing materials, etc. Technical requirements for fine model shear testing, imperfect biaxial shear testing methods, etc.

Active Publication Date: 2019-09-10
SHANGHAI JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] At present, the biaxial shear test method is not perfect, and there are deficiencies and defects in the control of positive and negative shear stress field, shear stress preload, shear stress level and normal stress level, and cannot accurately reveal the true shear mechanical properties of fabric membrane materials, and Determining the law of its parameters does not meet the technical requirements of the shear test for the fine model of fabric membrane materials

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • A kind of biaxial shear test method of fabric membrane material
  • A kind of biaxial shear test method of fabric membrane material
  • A kind of biaxial shear test method of fabric membrane material

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Embodiment Construction

[0035] The invention provides a method for biaxial shear testing of fabric membrane materials, comprising the following steps:

[0036] Step 1. Fabricate a cross-shaped biaxial shear specimen using the fabric membrane material, so that the included angle between the warp and weft direction of the fabric membrane material and the cross-shaped main axis of the specimen is 45°.

[0037] figure 1 shows the top view of the fabricated cross-shaped biaxial shear specimen, which includes a central core area 1 and four outriggers 2, and the ends of the outriggers 2 are clamping segments 3, which are used to connect The fixture of the biaxial tensile testing machine, the outrigger 2 transmits the load applied by the biaxial tensile testing machine to the central core area 1; the central core area 1 is the test area, and the fabric film is obtained by testing the shear deformation of the central core area 1 shear properties of the material. In this embodiment, two high-precision extens...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention discloses a biaxial shear test method of a fabric membrane material. The method comprises steps as follows: S1, a cross-shaped biaxial shear test piece is manufactured from the fabric membrane material, so that the included angle between the warp / weft direction of the fabric membrane material and a cross-shaped spindle of the test piece is 45 degrees; the cross-shaped spindle comprises an x axis and a y axis which are perpendicular mutually; S2, a biaxial shear loading spectrum of the fabric membrane material is defined according to parameters of the cross-shaped biaxial shear test piece, and the biaxial shear loading spectrum of the fabric membrane material is used for the cross-shaped biaxial shear test piece. According to the method, the biaxial shear loading spectrum can realize graded cyclic shear load and cyclic pre-shear load of positive and negative stress contained in a shear stress ring. The method can be used for measuring and representing the biaxial shear rigidity and mechanical behavior of the fabric membrane material and can be applied to the building fabric membrane material, airship fabric skin and other industrial fabric fields.

Description

technical field [0001] The invention relates to a biaxial shear test method for fabric membrane materials, which can be used for shear tests of fabric membrane materials such as architectural fabric membrane materials and airship fabric skins, and belongs to the technical field of material mechanics experiments. Background technique [0002] Fabric membrane is a widely used composite material, mainly used in civil engineering, aerospace and other industrial fields. The fabric membrane is composed of a fabric base cloth, which is made of polymer fibers through spinning and weaving. Fabric membrane materials are generally in a two-way tension state in the working stress state, but due to the asymmetric load, complex microstructure of materials, complex actual constraint boundaries and construction tension process, the fabric membrane will also produce a shear stress state. Fabric membrane is a polymer composite material with complex mechanical properties. Its tensile mechanic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/32G01N3/02
Inventor 陈务军高成军石泰百王平安王梅
Owner SHANGHAI JIAOTONG UNIV
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