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Comprehensive judgment method for performance irradiation ageing damage of elastomer for nuclear power

A judging method and technology of elastomers, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of inability to influence radiation performance and aging damage mechanism judgment, no comprehensive analysis system, harsh service conditions of polymer materials, etc.

Inactive Publication Date: 2016-09-28
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, materials will be affected by γ-rays during normal use of nuclear power plant equipment, and will be irradiated by β-rays under accident conditions. In addition, the comprehensive effects of various environmental factors such as light, oxygen, water, and electricity will easily lead to material damage. aging performance
With the extension of the service life, the service conditions of polymer materials are becoming increasingly harsh, and the aging damage is becoming more and more complicated, which leads to the gradual deterioration of its physical and mechanical properties, thus posing a great safety hazard
However, at present, there is no systematic comprehensive analysis system for the aging damage research of modified rubber elastomers used in nuclear power, and it is impossible to accurately determine the impact of radiation performance and aging damage mechanism

Method used

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  • Comprehensive judgment method for performance irradiation ageing damage of elastomer for nuclear power
  • Comprehensive judgment method for performance irradiation ageing damage of elastomer for nuclear power
  • Comprehensive judgment method for performance irradiation ageing damage of elastomer for nuclear power

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Example 1: Oxidative degradation damage model and analysis

[0032] figure 1 Shown is a group of tensile samples before and after irradiation. The irradiation conditions are: γ-ray source, dose rate 0.5kGy / h, dose rate 0.5MGy. It can be seen that the elongation at break of the modified rubber decreases after irradiation, and the surface is obviously sticky. The blank sample shows better rebound characteristics after stretching, while the deformation degree of the irradiated sample is significantly reduced. Small, preliminarily judged that the material has undergone radiation degradation and aging damage.

[0033] Using 3DSM and SEM methods, observe figure 1 (a) Tensile fracture micromorphology. It can be clearly seen that before irradiation, an obvious white semicircle area appears on the tensile section of the modified rubber, and there is a large inclusion in the center of the circle ( figure 2 (a)), causing this place to become a stress concentration area, which...

Embodiment 2

[0036] Example 2: Damage mode and analysis dominated by cross-linking embrittlement

[0037] Figure 7 Shown is the tensile fracture morphology of a modified rubber after irradiation. The irradiation conditions are: γ-ray dose rate 10kGy / h, dose 10MGy. The test results of physical and mechanical properties show that the tensile strength of the sample is slightly lower than that before irradiation, the elongation at break is greatly reduced, and the volume resistivity is increased. It is preliminarily judged that the irradiation aging mode is dominated by crosslinking reaction. Then it was observed that the surface of the sample changed, and a dark film was formed on the edge, with a film thickness of 0.1mm ( Figure 7 (a)), because the sample shows that it is irradiated with radiation and exposed to air at the same time, and a higher degree of oxidation process will occur on the surface to form an oxide film. There is a circular heterogeneous area in the middle of the tensil...

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Abstract

The invention relates to a comprehensive judgment method for performance irradiation ageing damage of an elastomer for nuclear power. The comprehensive judgment method particularly comprises the following steps of: (1) carrying out macro-performance test on an elastomer material, and preliminarily evaluating the ageing condition of each macro-performance of the irradiated material; (2) carrying out appearance observation on an irradiation sample, and judging the fracture mode is one or more reasons of ductile fracture, brittle fracture and the like by combining with a test result of the mechanical performance of the step (1); and (3) carrying out system analysis and testing on parts such as a tensile fracture surface and the interior of the material by virtue of multiple detection measures, and accurately judging the reasons of the ageing damage of the material by combining with a fracture appearance observation result of the step (2). By virtue of rapid analysis on typical modified rubber for the nuclear power under a ray irradiation condition, the reasons of the ageing damage of the elastomer material are accurately judged, and therefore, the targeted failure prevention and life prediction can be carried out. The comprehensive judgment method has application values in the evaluation on the service performance of other elastomer polymer materials in the fields of nuclear power, thermal power and petrochemicals, and the effective reference basis is provided for the selection and quality evaluation of materials in practical engineering application.

Description

technical field [0001] The invention belongs to the technical field of material detection for nuclear power equipment, and in particular relates to a method for judging the radiation aging damage of elastic body properties used in nuclear power, in particular to a method for judging the radiation aging damage of modified rubber materials for cable insulation sheaths and gaskets Measure to judge. Background technique [0002] As a safe, clean and efficient energy, nuclear energy occupies an increasingly important position in the field of energy utilization and development with its own advantages and huge economic benefits. However, with high production capacity and rapid development, the safety of nuclear power plants has been widely concerned by the society, especially the occurrence of the Fukushima incident in Japan has once again sounded the alarm to the world. The safe operation of nuclear power plants depends on the overall coordination, cooperation, efficiency and rel...

Claims

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Application Information

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IPC IPC(8): G01N17/00
Inventor 杨振国胡诗萌
Owner FUDAN UNIV
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