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A comprehensive evaluation method for the causes of radiation aging damage of engineering plastics used in nuclear power

A technology for engineering plastics and damage causes, which is applied in the field of nuclear power equipment material testing, and can solve problems such as performance aging, hazards, and radiation aging damage without characterization means and analysis systems

Inactive Publication Date: 2019-11-12
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the complex service conditions of nuclear power plants, polyetheretherketone materials may still experience performance aging or even failure due to environmental conditions such as radiation, heat, and oxygen, which may lead to abnormal accidents in the control system of nuclear power plants, causing serious damage to the country and the country. great harm to society
However, at present, there is no systematic characterization means and analysis system for the research on the radiation aging damage of polyether ether ketone engineering plastics used in nuclear power, and it is impossible to accurately determine the cause of its radiation influence and aging damage.

Method used

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  • A comprehensive evaluation method for the causes of radiation aging damage of engineering plastics used in nuclear power
  • A comprehensive evaluation method for the causes of radiation aging damage of engineering plastics used in nuclear power
  • A comprehensive evaluation method for the causes of radiation aging damage of engineering plastics used in nuclear power

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Effect test

Embodiment 1

[0039] Example 1: Causes and analysis of aging damage under irradiation dose conditions

[0040] Figure 1 shows the tensile force value deformation curve of polyetheretherketone (PEEK) before and after electron beam irradiation. It can be seen that the tensile curve of PEEK belongs to the standard saddle curve, which goes through stages of elastic deformation, yield (necking), large deformation and strain hardening (Fig. 1(a)). In the elastic deformation stage of the material, the stress of the material increases rapidly, while the strain change is relatively small, and the elastic modulus is high. It is worth noting that the elastic modulus of the irradiated material decreases and the stress value increases (Fig. 1(b)). At the same time, the density of the material increased after irradiation (figure 2 ). It is obvious that the material has a certain radiation aging phenomenon after irradiation.

[0041] Using 3DSM and SEM methods, the surface and tensile fracture of the s...

Embodiment 2

[0045] Example 2: Causes and Analysis of Aging Damage Under Irradiation Dose Rate Conditions

[0046] Fig. 8 shows a tensile force value deformation curve before and after the gamma ray irradiation dose rate condition. It can be seen that the elongation at break of the polyether ether ketone material decreases before and after irradiation under this condition, and the mechanical properties of the material have certain aging damage.

[0047] Further use SEM to observe the micro-morphology of the tensile section. It can be observed that the interior of the material is also divided into two areas, there are semicircular dissociation surfaces at the upper and lower edges, and the cracks extend from the surface to the inside; the structure in the right half is loose, the surface is uneven, and it is a ductile area ( Figure 9 (a)). The stretch lines on the cleavage surface are white due to the force, and the deformation can be seen after zooming in ( Figure 9 (b), (c)), this is...

Embodiment 3

[0050] Example 3: Causes and analysis of aging damage at irradiation temperature

[0051] Fig. 11 shows the deformation curves of the tensile force value of polyetheretherketone before irradiation at room temperature and after irradiation with gamma rays at 80°C. It can be seen from the comparison that the tensile strength and elongation at break of the material before and after irradiation under this condition do not change much, and the aging degree of the mechanical properties of the material is not obvious.

[0052] Then use SEM to observe the tensile fracture morphology under the irradiation conditions, as shown in Figure 12 shown. It can be seen from the figure that the starting position of the tensile fracture after the irradiation condition is also on the surface of the sample, and the fracture is a semicircular cleavage plane, on which there are radial cracks ( Figure 12 (b)), which belongs to the characteristics of cleavage fracture; the crack edge also has bendi...

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Abstract

The invention relates to a method for comprehensive assessment of reasons of irradiation ageing damage of nuclear power engineering plastics. The method comprises the steps of performing physical and mechanical property testing of polymer materials, and preliminarily observing macroscopic performance aging conditions of the materials after irradiation; performing morphological observation of aging products, and determining fracture reasons of the aging products to be ductile fracture, general brittle fracture and dissociative type fracture and the like in combination with testing results of physical and mechanical properties; adopting one or more of atlas and thermal analysis detection means to test stretch fracture surfaces and the inside of the materials and the like, and determining changing conditions of crystallinity inside the materials; synthesizing multiple detection and analysis means to perform system analysis and research on an aging mode of the aging materials, and finally determining the reasons of irradiation ageing damage of the engineering plastics in combination with fracture appearance observation and crystallinity analysis results. After comprehensive assessment on performances of valve material polyether-ether-ketone for nuclear power under ray irradiation conditions, the reasons of aging damage of the polyether-ether-ketone material can be determined accurately, and thus reasonable quality evaluation and failure prevention are performed.

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 comprehensively evaluating the cause of radiation aging damage of engineering plastics used in nuclear power, in particular to a method for judging the cause of radiation aging damage of polyether ether ketone materials for valves. Background technique [0002] Since the 1950s, nuclear power generation has attracted more and more attention from all over the world due to its unique advantages. With the deepening of nuclear energy utilization and the increase in the number of nuclear power plants, the aging of nuclear power equipment has also increasingly aroused people's attention. focus on. Many nuclear power plants in my country have been put into operation for more than ten years. Although the operation time is relatively short, they have faced a series of problems such as performance aging and damage failure of eq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/00
CPCG01N17/00
Inventor 杨振国胡诗萌时淼
Owner FUDAN UNIV
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