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Method for testing wet expansion coefficient of composite material under dehumidification condition

A technology of wet expansion coefficient and test method, applied in the direction of analyzing materials, measuring devices, weighing by removing certain components, etc., can solve the problems of long time required for wet expansion coefficient and large measurement error, and shorten the test time. , The effect of wide test range and high resolution

Inactive Publication Date: 2019-12-17
HARBIN INST OF TECH
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Problems solved by technology

[0005] The present invention aims to solve the problems of long time and large measurement error in the prior art to test the coefficient of wet expansion

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  • Method for testing wet expansion coefficient of composite material under dehumidification condition
  • Method for testing wet expansion coefficient of composite material under dehumidification condition
  • Method for testing wet expansion coefficient of composite material under dehumidification condition

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Embodiment Construction

[0033] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0034] In addition, the positional relationship of "upper", "lower", "left", "right", "front", "rear", "top" and "bottom" of each structural member mentioned below is only for It is for ease of description and simplification of description, but does not indicate or imply that the referred device must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the present invention. In addition, if there are descriptions involving "first", "second" and so on in the embodiments of the present invention, the descriptions of "first", "second" and so on are only for descriptive purposes, and should not be interpreted as indicating or implying Its relative importance or implicitly indicates the number of technical features indicated. The meanings...

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Abstract

The invention provides a method for testing a wet expansion coefficient of a composite material under a dehumidification condition. The method comprises the following steps of: starting a measurementand control program, and adjusting the humidity in a vacuum tank to saturated humidity; under the environment of normal pressure, normal temperature and saturated humidity, placing a pretreated samplein the vacuum tank, recording, by a displacement sensor, the initial length of the sample, and recording, by a load sensor, the initial weight of the sample; starting a measuring and recording program, sealing the vacuum tank, carrying out vacuumizing, and dehumidifying and drying the sample in the vacuum way; collecting humidity, temperature and air pressure data in the vacuum tank, and recording the weight and length change of the sample; and adjusting the pressure in the vacuum tank to be normal pressure, and stopping the measurement and control program. According to the testing method provided by the invention, a dehumidification process of the sample is carried out before testing, and vacuum dehumidification is adopted in the testing process, so that measuring time is effectively shortened, and a measuring deviation caused by inherent time drift of an electric measuring instrument is also avoided.

Description

technical field [0001] The invention relates to the field of performance testing of composite materials, in particular to a method for testing the coefficient of moisture expansion of composite materials under dehumidification conditions. Background technique [0002] Fiber-reinforced resin-based composites have become important materials in aerospace vehicle structures due to their high specific strength and specific stiffness, good designability and fatigue fracture resistance. At present, the general environmental conditions for the manufacture and assembly of domestic aerospace composite materials are: temperature 20-25 ℃, humidity ≤ 75%, while in the southern region, the humidity in the rainy season is often above 85%, or even 90%. Such a large range of humidity changes, Composite components are stored on the ground, including molding, assembly, and testing processes. Due to the polymer structure of the composite resin matrix and the existence of pores and air bubbles i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04G01N33/00
CPCG01N5/04G01N33/00G01N33/0003
Inventor 耿洪滨钱志英罗文波赵震波赵云鹏刘志全李兴冀吕钢耿晨曦张翰兴
Owner HARBIN INST OF TECH
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