Method for testing external permeability of fibre fabre surface

A technology of fiber fabrics and test methods, applied in the fields of permeability/surface area analysis, measuring device, suspension and porous material analysis, etc., can solve the problems of no experimental method, difficult to achieve, etc., and achieve easy handling, thickness direction increase, easy Effects of Image Analysis and Calculation

Inactive Publication Date: 2005-08-10
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method proposes a mathematical model for calculating four in-plane permeability and two out-of-plane permeability, but there is no experiment

Method used

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  • Method for testing external permeability of fibre fabre surface
  • Method for testing external permeability of fibre fabre surface
  • Method for testing external permeability of fibre fabre surface

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0023] Example 1

[0024] Disc-shaped sample 4 was prepared by domestic glass fiber tape. Its specifications and performance parameters are listed in Table 1. The fiber porosity ε is calculated according to the formula (2) to be 71.5% (the density of the fiber is calculated as 2.54), the sample is put into the test device, and the center of the sample 4 is required to be consistent with the center of the injection hole, and the gaskets are placed in turn 8. The upper mold 3 and the pressure transmission frame 2 make the upper and lower molds 3 and 5 clamp the sample 4; then turn on the fluid injection switch, the digital camera 1 switch and the computer acquisition system 9; the out-of-plane permeability can be determined according to the Darcy's law formula (1) to calculate, the calculation results are shown in Table 2. In the embodiment, the thickness h of the gasket is 9.83 mm, and the numerical value of the injected constant pressure is 58675 Pa obtained by collecting th...

Example Embodiment

[0030] Example 2

[0031] The same domestic glass fiber tape as in Example 1 was used to prepare the sample, and its specifications and performance parameters are as described in Table 3. Fiber porosity ε calculates 68.7% (the density of fiber is calculated with 2.54) by formula (2), injects constant pressure, obtains 65532Pa through the data of computer collection pressure sensor; Conditions such as gasket thickness, fluid viscosity are identical with embodiment 1. The radius of the flow front is obtained by image analysis based on the data recorded by the digital camera 1, as shown in Table 4, and the out-of-plane permeability parameters can be calculated by substituting the obtained parameters into formula (1).

[0032] Table 3. Parameters of glass fiber tapes used in the samples

[0033] Thickness Width Density Weave Weight Diameter

[0034] (mm) (mm) (root / cm) (gram) (mm)

[0035] 0.1±0.01 10±1 longitude 10 weft 8 plain weave 552.1 300

[0036] ...

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Abstract

The present invention relates to a test method of out-of-shell permeability of fibre fabric. Said method includes the following processes: firstly, preparing fibre fabric to be tested into ribbon-like form and making it into winded circular disk sample; placing said sample into a test die equipment formed from upper die and lower die, clamping and making centre of sample be aligned with centre of fluid injection hole on the lower die; utilizing fluid injection system to inject fluid with constant pressure; utilizing pressure sensor and computer data acquisition system to acquire pressure value, at the same time utilizing digital camera to record the position where the fluid is passed through fibre fabric sample flow front edge; then utilizing the data obtained by test experiment to calculate the said out-of-shell permeability according to the Dashi law.

Description

technical field [0001] The present invention belongs to the testing technology of the properties of fiber fabrics, and in particular relates to the testing method of out-of-plane permeability characteristics of fiber fabrics when they are used as composite reinforcement materials. The international patent classification number is intended to be Int.C1 7 .G01B 11 / 00. Background technique [0002] When using liquid forming technology to manufacture composite components, its quality 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 the fiber fabric, the operation of the equipment, and the formulation of process conditions. Permeability is a characteristic of fibers and one of the important parameters affecting liquid forming technology. Fiber permeability can be divided into in-plane permeability and out-of-plane permeability. The out-of-plane permeability i...

Claims

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Application Information

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IPC IPC(8): G01N7/10G01N15/08
Inventor 吴晓青李嘉禄
Owner TIANJIN POLYTECHNIC UNIV
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