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A method for predicting the effect of thermal cycling on thermal expansion coefficient of polymer matrix composites based on free radical content

A thermal expansion coefficient and composite material technology, applied in the thermal expansion coefficient of materials, analysis materials, measurement devices, etc., can solve the problems of high difficulty in measurement and long time required for measurement

Active Publication Date: 2020-10-30
HARBIN INST OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the measurement of the coefficient of thermal expansion of polymer-based composite materials with complex structures takes a long time and is difficult to measure due to the limitation of experimental conditions and equipment conditions during the spacecraft’s on-orbit operation. question

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  • A method for predicting the effect of thermal cycling on thermal expansion coefficient of polymer matrix composites based on free radical content
  • A method for predicting the effect of thermal cycling on thermal expansion coefficient of polymer matrix composites based on free radical content
  • A method for predicting the effect of thermal cycling on thermal expansion coefficient of polymer matrix composites based on free radical content

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specific Embodiment approach 1

[0029] Specific implementation mode one: combine figure 1 This embodiment will be described. A method for predicting the effect of thermal cycles on the thermal expansion coefficient of polymer-based composite materials based on the content of free radicals described in this embodiment, the specific steps of the method are:

[0030] Step 1. Select the polymer-based composite material as the experimental sample, and conduct a thermal cycle test on the selected experimental sample under the condition that the vacuum degree is less than 1Pa; set the number of thermal cycles for each group of thermal cycle tests to not less than 200 times, The number of groups of thermal cycle test shall not be less than 3 groups;

[0031] Step 2, take out the experimental sample after each thermal cycle, and carry out the thermal expansion coefficient test to the experimental sample taken out; Record the thermal expansion coefficient under the different thermal cycle times of each group of therm...

specific Embodiment approach 2

[0039] Specific embodiment 2: This embodiment further limits the method for estimating the effect of thermal cycles on the thermal expansion coefficient of polymer-based composite materials based on the content of free radicals described in Embodiment 1. In step 1 of this embodiment The size of the experimental sample is: length 20mm~25mm, width 5mm~6mm, thickness 1mm~3mm; set the temperature range of each thermal cycle to -150℃~150℃;

[0040] Set the ambient temperature around the experimental sample to gradually cool down from 150°C to -150°C, the cooling rate is x, and 0.2≥x>0, the unit is °C / min, and then gradually increase the ambient temperature from -150°C at the heating rate x to 150°C; when the ambient temperature around the experimental sample is from 150°C to -150°C, and then from -150°C to 150°C, it is a thermal cycle;

[0041] In this embodiment, the temperature range of each thermal cycle is set to be -150° C. to 150° C. to ensure that the test temperature of the...

specific Embodiment approach 3

[0042] Specific embodiment three: This embodiment further limits the method for estimating the effect of thermal cycles on the thermal expansion coefficient of polymer-based composite materials based on the content of free radicals described in embodiment two, and the polymer-based composite material is carbon fiber composite material.

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Abstract

The invention relates to a method for predicting thermal expansion coefficient of polymer-based composite material based on free-radical content prediction thermal cycle, and belongs to the technicalfield of the evaluation of the dimensional stability of the composite material. The method solves the problem that, during the orbital operation of the spacecraft, due to experimental conditions and equipment conditions, the measurement of the thermal expansion coefficient of a structurally complex polymer-based composite material takes a long time with high difficulty. Under the condition that the degree of vacuum is less than 1Pa, a thermal cycle experiment is carried out on the polymer-based composite material which needs to measure the thermal expansion coefficient. It's concluded that thefree radical content of the polymer matrix composite is consistent with the variation law of the number of thermal cycles and the variation of thermal expansion coefficient with the number of thermalcycles. Therefore, the thermal expansion coefficient of the polymer-based composite can be predicted only by measuring the free-radical content during the orbit operation. The method can be applied to the technical field of the evaluation of the dimensional stability of the composite material.

Description

technical field [0001] The invention belongs to the technical field of evaluating the dimensional stability of composite materials, and in particular relates to a method for predicting the influence of thermal cycles on the thermal expansion coefficient of polymer-based composite materials based on free radical content. Background technique [0002] In the field of aerospace, polymer-based composite materials are mainly used in structures such as main load-bearing cylinders, solar array substrates, optical remote sensors, and parabolic antennas. Since the spacecraft needs to repeatedly enter and exit the shadow area of ​​the earth during its orbital operation, the ambient temperature of the spacecraft changes alternately within the range of -160°C to 120°C. NASA, ESA and my country have clearly stipulated the vacuum thermal cycle experiment specifications for the acceptance of spacecraft and their components. It can be seen that the study of the behavior of polymer-based com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/16G01N33/00
CPCG01N25/16G01N33/00
Inventor 李兴冀杨剑群白刚李红霞罗文波张新伟徐庆鹤卢清荣
Owner HARBIN INST OF TECH
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