Biaxial tension-compression test piece with matrix fiber bundle and preparation method thereof

A technology of matrix fibers and test pieces, which is used in the preparation of test samples and the application of stable tension/pressure to test the strength of materials, etc., to achieve the effect of reducing costs, accurate measurement results, and simplifying the loading device

Active Publication Date: 2017-08-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a biaxial tension-compression test piece and its preparation method which are simple to manufacture, low in test cost, good in test piece quality, and less prone to compression instability

Method used

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  • Biaxial tension-compression test piece with matrix fiber bundle and preparation method thereof
  • Biaxial tension-compression test piece with matrix fiber bundle and preparation method thereof
  • Biaxial tension-compression test piece with matrix fiber bundle and preparation method thereof

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Embodiment Construction

[0029] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0030] The preparation method of the biaxial tension-compression test piece with matrix fiber bundle of the present invention comprises the following steps:

[0031] Step 1, applying the principle of periodicity to prepare a single-layer prefabricated body with matrix fiber bundles. In order to ensure that the shape of the matrix fiber bundle in the sample is consistent with that in the real composite material, the two-dimensional woven fiber cloth ( figure 1 ) The weft fiber 2 in the middle section is drawn out, leaving only the warp fiber 1, and the periodicity of the warp fiber should not be disturbed during the process of extracting the weft fiber;

[0032] Step 2, the fiber cloth obtained in step 1 ( figure 2 ) are stacked along the thickness direction and fixed on the mold, and the matrix is ​​deposited repeatedly to obtain a flat plat...

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Abstract

The invention discloses a biaxial drawing-pressing test part with a matrix fiber bundle. The biaxial drawing-pressing test part comprises a long strip-shaped sample and is characterized in that the long strip-shaped sample comprises a fiber cloth deposited matrix, the middle of the long strip-shaped sample is a test part, two ends of the long strip-shaped sample are clamping parts, the test part only contains warp-wise fibers circularly distributed along a long strip-shaped sample width direction, the clamping parts are braided structures, anti-drag rubber parts are fixed to two sides of the test part under compressive load, the length of the anti-drag rubber parts is the same to the length of the test part, and a compressive loading head is fixed to the outer side of each one of the anti-drag rubber parts. The biaxial drawing-pressing test part has the advantages of simple preparation processes, low experiment cost, good test part quality and low compressive instability.

Description

technical field [0001] The invention relates to the field of mechanical testing of composite materials, in particular to a biaxial tension-compression test piece with matrix fiber bundles and a preparation method thereof. Background technique [0002] Fiber bundles with a matrix are the main load-bearing structures in composite materials. Studies have shown that the macroscopic mechanical behavior and microscopic failure process of composite materials are closely related to the mechanical properties of fiber bundles with matrix. In recent years, with the rise of multi-scale calculation methods for composite materials, it has become a hot issue in the field of multi-scale calculation of composite materials to use fiber bundles with matrix as small composite materials to conduct in-depth research on the mechanical properties of composite materials. Fiber bundles with a matrix are generally in a multiaxial coupled stress state in composite materials, and one of the common stre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N1/28
Inventor 于国强宋迎东高希光
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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