Analysis and evaluation method for high-temperature bolt connection sealing structure

By establishing a creep-relaxation coupling model and combining finite element analysis and experimental methods, the problem of failing to effectively evaluate the sealing performance of high-temperature bolted connection structures in existing technologies has been solved, achieving accurate evaluation under high-temperature environments and reducing the risk of leakage.

CN122365734APending Publication Date: 2026-07-10NUCLEAR POWER INSTITUTE OF CHINA
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Patent Information

Application Number
CN202511788302.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-01
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing standards fail to effectively consider the creep and relaxation behavior of bolted connections in high-temperature environments, resulting in insufficient assessment of sealing performance, especially in fourth-generation nuclear reactors where the risk of leakage is high.

Method used

A creep-relaxation coupled model was established using a combination of finite element analysis and experimental methods. The deformation and stress of the flange bolt connection structure were evaluated by using ANSYS finite element modeling, Norton and Omega constitutive models, and Bailey and Johnson relaxation models. The sealing performance was then evaluated in conjunction with experimental data.

Benefits of technology

It enables accurate assessment of the sealing performance of bolted connections under high-temperature environments, reduces the risk of leakage, and improves the safety and reliability of the assessment.

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Abstract

The invention belongs to the technical field of reactor structural mechanics, and particularly relates to an analysis and evaluation method for a high-temperature bolt connection sealing structure. The method comprises the following steps: selecting a connection position of a reactor pressure vessel flange and a king bolt as a sealing structure analysis object; analyzing and summarizing the influence of the data of the gasket on the deformation amount and the contact surface pressure of each component of the flange bolt connection structure; investigating current specifications, and analyzing limitation of the specifications; finite element software ANSYS is adopted for conducting finite element modeling on the reactor pressure vessel flange and main bolt structure; applying load and constraint to the reactor pressure vessel flange and kingbolt structure finite element model; calculating deformation and stress of the structure by adopting different creep models and relaxation models; analyzing the relaxation behavior of the high-temperature flange bolt connection structure by adopting an experimental method; and comparing and analyzing results of the finite element method, the specification method and the test method. According to the invention, the sealing performance of the flange bolt connection structure in a high-temperature environment can be analyzed and evaluated.
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