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Fiber heat conductivity determination method

A technology of thermal conductivity and fiber, which is applied in the field of thermal conductivity measurement of materials, can solve problems such as measurement limitations of inhomogeneous or anisotropic materials, and achieve the effect of simple and practical preparation method, convenient operation and simple testing principle

Inactive Publication Date: 2016-07-20
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The heat source of the hot wire method is linear, which is different from the point-like or scattered heat source. The heat flow of the linear heat source has a certain direction in the test sample, so it is more suitable for measuring homogeneity or isotropy. materials, while measurements of inhomogeneous or anisotropic materials have significant limitations

Method used

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Examples

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Embodiment 1

[0055] In this embodiment, the fiber to be tested is carbon fiber (T700SC-12000-50C), and the thermal conductivity meter is a solid hot wire method thermal conductivity meter developed by Xi'an Xiaxi Electronic Technology Co., Ltd.

[0056] The method for measuring fiber thermal conductivity in the present embodiment comprises the steps:

[0057] (1) Preparation of test samples: A carbon fiber bundle is evenly wound in parallel to form test samples with 7 arrangement angles. Each test sample is composed of 4 parallel samples 1, and the size of parallel sample 1 is 40mm×40mm×0.93 mm.

[0058] In order to reduce the preparation time of parallel sample 1, 7 arrangement angles are set, which are 0°, 15°, 30°, 45°, 60°, 75° and 90°, among which 0° and 90°, 15° and 75°, 30° and 60° are complementary, that is, by rotating the center of the parallel sample 1 at one arrangement angle by 90°, it can be transformed into a parallel sample 1 at another arrangement angle that is complement...

Embodiment 2

[0067] The method for measuring fiber thermal conductivity in the present embodiment specifically comprises the following steps:

[0068] (1) Sample preparation: the fibers to be tested are uniformly wound in parallel into 5 test samples with different arrangement angles by winding method, and the test samples for each arrangement angle are composed of 3 parallel samples 1;

[0069] (2) Determination of thermal conductivity of test sample:

[0070] (2-1) Place the test sample prepared in step (1) in a constant temperature and humidity environment for 10 hours;

[0071] (2-2) Place the stabilized test sample in step (2-1) on the thermal conductivity meter, and place the hot wire sensor 2 in the middle of the two parallel samples 1 to form a sandwich structure, and then measure the thermal conductivity;

[0072] (3) Data processing:

[0073] (3-1) Select a point as a dot, and use the dot as a starting point to draw 5 rays that are equally divided along the circumference. Each ...

Embodiment 3

[0086] The method for measuring fiber thermal conductivity in the present embodiment specifically comprises the following steps:

[0087] (1) Sample preparation: the fibers to be tested are uniformly wound in parallel into 6 test samples with different arrangement angles by winding method, and the test samples for each arrangement angle are composed of 2 parallel samples 1;

[0088] (2) Determination of thermal conductivity of test sample:

[0089] (2-1) Place the test sample prepared in step (1) in a constant temperature and humidity environment for 30 hours;

[0090] (2-2) Place the stabilized test sample in step (2-1) on the thermal conductivity meter, and place the hot wire sensor 2 in the middle of the two parallel samples 1 to form a sandwich structure, and then measure the thermal conductivity;

[0091] (3) Data processing:

[0092] (3-1) Select a point as a circle point, and draw 6 rays equally divided along the circumference with the circle point as the starting poi...

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Abstract

The invention relates to a fiber heat conductivity determination method. The method includes: uniformly winding or adhering to-be-tested fibers to form test samples with N different arrangement angles, sequentially determining heat conductivity of the test samples and processing data. Compared with the prior art, the fiber heat conductivity determination method has the advantages that test principle simplicity and convenience in sampling are realized, internal structures of the samples are undamaged, test stability is achieved, integral distribution of fiber heat conductivity in different fiber directions can be directly reflected, the problem of failure in clear reflection of corresponding relation between each directional structure of fibers and heat conductivity in the prior art can be solved, heat conductivity test of heterogeneous or anisotropic materials according to a hot-wire method is realized, and advantages and disadvantages of fiber heat conductivity can be assessed comprehensively.

Description

technical field [0001] The invention belongs to the technical field of measuring thermal conductivity of materials, and relates to a method for measuring the thermal conductivity of fibers. Background technique [0002] Fiber is a kind of soft and slender material, which is widely used in aerospace, medical, military, energy, construction and other engineering fields. The thermal conductivity is one of the important factors affecting the application range of different fiber varieties. Therefore, it is of great significance to measure the thermal conductivity of fibers and further evaluate their thermal conductivity. However, due to the special fiber shape and fine size, it is difficult to measure the thermal conductivity of a single fiber, and there is currently no standardized test method for the thermal conductivity of fibers. For the evaluation of fiber thermal conductivity, most fiber / resin composite materials are tested to obtain the thermal conductivity of the overall...

Claims

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Application Information

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IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 肖俐刘晓霞
Owner SHANGHAI UNIV OF ENG SCI
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