Determination method for orthogonal non-woven three-dimensional rectangular fabric permeability
A technology for fabric penetration and determination methods, which is applied in the fields of permeability/surface area analysis, measurement device, suspension and porous material analysis, etc. It can solve the problems of complicated operation process, difficult to obtain experimental results, time-consuming and labor-intensive, and save manpower and material resources. , Overcome the effect of low test efficiency
Inactive Publication Date: 2014-07-02
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
However, the flow observation test is limited by the interference of human factors, and it is difficult to obtain stable experimental results. The operation process is not only complicated, but also time-consuming and labor-intensive, and requires special sample preparation.
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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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[0134] The object is a glass fiber orthogonal non-woven three-dimensional rectangular fabric, and the specifications of the shaft yarns in the X, Y, and Z directions are different, and the specific parameters are different.
[0135] X axis yarn: single filament diameter is 11μm, single bundle 2000 filaments;
[0136] Y axis yarn: single filament diameter is 7.5μm, single bundle 4400 filaments;
[0137] Z axis yarn: single filament diameter is 21μm, 900 filaments per bundle.
[0138] (1) After the fabric is shaped, slice it, observe the cross-section perpendicular to each main axis, use the IPP image analysis software to calculate the cross-sectional area of each bundle of yarn, and use the area equivalent method to convert the yarn section into a circle shape:
[0139] A x ≈3.2×10 -7 m 2 ;A y ≈3.0×10 -7 m 2 A z ≈4.16×10 -7 m 2
[0140] According to the formula (1), it can be obtained
[0141] D. x ≈2.02mm;D y ≈1.95mm;D z ≈2.30mm;
[0142] (2) The typical un...
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Abstract
The present invention relates to a determination method for orthogonal non-woven three-dimensional rectangular fabric permeability. Technical characteristics of the determination method comprise: carrying out slicing observation on a fabric to obtain structure parameters of unit cell and yarns thereof, and calculating equivalent permeability of a gap between the yarn and the bundle; respectively according to an X main axis direction, a Y main axis direction and a Z main axis direction, dividing the unit cell into 4 sub-regions parallel to the main axis directions according to a common tangency surface between the yarns, wherein the sub-region is a uniform porous medium; then respectively calculating equivalent permeability of the sub-region in the main axis direction according to a series connection mixing law; and respectively calculating permeability of the unit cell in the main axis direction according to a parallel connection mixing law, wherein the permeability of the unit cell in the main axis direction is the fabric permeability. According to the determination method, a flow test is not required, development of a specialized mold is not required, the permeability can be rapidly calculated only by obtaining simple physical parameters of the fabric, and disadvantages of low test efficiency, complex sample preparation and the like of the existing method are overcome.
Description
technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a method for determining the permeability of an orthogonal nonwoven three-dimensional rectangular fabric. Background technique [0002] The important structural form of advanced composite material reinforcement is three-dimensional structure, and orthogonal non-woven three-dimensional fabric is one of the important ones. Orthogonal non-woven three-dimensional fabrics have good overall mechanical properties because the yarns in X, Y, and Z directions are vertically arranged in space, and the fibers are kept straight without "waves". widely used. [0003] Permeability is an important index to reflect the permeability of fabrics, and is the key to determine the parameters of the subsequent liquid forming process. At present, researchers are mainly focusing on the characterization of the permeability of two-dimensional fabrics, three-dimensional structures represented...
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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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IPC IPC(8): G01N15/08
Inventor 蒋建军方良超邓超史景文王俊彪
Owner NORTHWESTERN POLYTECHNICAL UNIV