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

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 and a testing mold. 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 testing mold comprises a mold panel and a storage tank, wherein the mold panel is fixedly connected above the storage tank to form a sealed containing cavity, micropores communicated with the sealed containing cavity are arranged on the mold panel, and a liquid flow channel communicated with an external liquid injecting system is arranged at the bottom of the storage tank. The invention has the advantages of simple operation, high accuracy, strong applicability, low cost, and the like.

Description

technical field The invention relates to a testing method and a testing mold for the permeability of a porous material, in particular to a testing method and a testing mold for the permeability of a fiber fabric. Background technique 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 ou...

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Problems solved by technology

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.

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