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Testing method of external permeability of fiber fabric surface and testing mold

A technology of fiber fabrics and testing methods, applied in the field of testing the permeability of porous materials

Inactive Publication Date: 2011-06-22
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there is no standard for the test method of the out-of-plane permeability of fiber fabrics at home and abroad, that is, a unified, reliable and stable test method has not yet been formed

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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  • Testing method of external permeability of fiber fabric surface and testing mold
  • Testing method of external permeability of fiber fabric surface and testing mold
  • Testing method of external permeability of fiber fabric surface and testing mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] a kind of like figure 1 The test mold of the out-of-plane permeability of fiber fabric shown in the present invention, this test mold comprises the storage tank 2 of mold panel 1 and testing fluid, and mold panel 1 is smooth and flat, and can bear certain pressure, and storage box 2 is a concave Groove shape, the mold panel 1 is similar to a cover on the storage box 2, and is fixed on the top of the storage box 2 to form a closed cavity 21. A flexible vacuum bag film 3 is covered above the mold panel 1 to form a mold cavity 4. The edge of the flexible vacuum bag film 3 forms a seal with the mold panel 1. A vacuum pump connected to the external vacuum system is provided on the flexible vacuum bag film 3. Air port 31. A plurality of microholes 11 are evenly distributed on the mold panel 1 (through holes communicating with the mold cavity 4 and the airtight cavity 21, see figure 1 ), the pore diameter of the micropore 11 is 50 μm; the bottom of the storage box 2 is eve...

Embodiment 2

[0052] This embodiment adopts the same test mold as that of Embodiment 1.

[0053]The objects tested in this embodiment are 72 layers of 02 glass cloth, 36 layers of 04 glass cloth, 18 layers of 4:1 glass fiber woven cloth (weft 4 warp 1) and 18 layers of 1:4 glass fiber woven cloth ( Weft 1 and warp 4), the vacuum negative pressure ΔP in the test is 0.097MPa, the operating steps of the test method of this embodiment and all the other process parameters are the same as in Example 1 (the linear relationship diagram of the fiber fabric preform of four different layers) Respectively as Figure 9 ~ Figure 12 shown).

[0054] The test results of this embodiment are shown in Table 2 below:

[0055] Table 2: The test process parameter list of different ladder ply numbers in embodiment 2

[0056]

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Abstract

The invention belongs to a testing method of permeability of porous materials, in particular to a testing method of external permeability of a fiber fabric surface. The method comprises the following steps: firstly, laying fiber fabric to be tested into n numbered steps on a mold panel, and then, sealing to form a mold cavity; carrying out vacuum pumping treatment, measuring and recording distance Ln between each step surface and the mold panel, injecting fluid for testing by utilizing vacuum negative pressure, and recording time tn for the flow front of the fluid for testing to reach each step surface; and drawing a linear relation graph of tn and the square of Ln, fitting to obtain a slope k, and then, calculating the external permeability K of the surface of the fiber fabric to be tested according to the formula. The invention has the advantages of simple operation, high accuracy, strong applicability, low cost, and the like.

Description

technical field [0001] The invention relates to a method for testing the permeability of porous materials, in particular to a method for testing the permeability of fiber fabrics. Background technique [0002] When using liquid forming technology to manufacture composite material components, the quality of composite material components is affected by many factors, including the properties of fiber reinforced materials, the properties of the matrix, the properties of the interface between the matrix and fiber fabrics, the operation of equipment and the formulation of process conditions wait. Permeability is one of the characteristics of fiber reinforced materials and one of the important parameters affecting liquid molding technology. Fiber permeability can be divided into in-plane permeability and out-of-plane permeability. In-plane permeability is an indicator of the resistance a fluid experiences when passing through the plane of a fabric. The out-of-plane permeability...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
Inventor 杨孚标杨金水彭超义肖加余曾竟成刘卓峰
Owner NAT UNIV OF DEFENSE TECH
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