Expansion joint reliability fatigue life assessment method

A technology of fatigue life and expansion joints, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as circuit deformation and short circuit, earthquake displacement, and expansion joint reliability fatigue life can only be a single part, etc., to reduce Cost and cycle effects

Active Publication Date: 2019-07-30
CHINA AERO POLYTECH ESTAB
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AI Technical Summary

Problems solved by technology

It overcomes the problem of the transmission line in the traditional electrical system, for example, the uncompensated corrugated tube in the UHV transmission line causes the circuit deformation and short circuit, and overcomes the thermal expansion and contraction that cannot simulate the actual use environment in the prior art, for example, Axial displacement, and the problem of seismic displacement
At the same time, it overcomes the problem that the reliability fatigue life evaluation test of the expansion joint can only be carried out on a single part in the prior art

Method used

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  • Expansion joint reliability fatigue life assessment method
  • Expansion joint reliability fatigue life assessment method
  • Expansion joint reliability fatigue life assessment method

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Embodiment Construction

[0062] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure. The method for evaluating fatigue life of expansion joint reliability according to the present invention is an expansion joint based on finite element simulation and random sampling technology. Section product reliability fatigue life assessment methods, such as Figure 1 to Figure 4 As shown, it specifically includes the following steps:

[0063] Step 1, determine the weak link of the fatigue life of the expansion joint product, the corresponding fai...

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Abstract

The expansion joint reliability fatigue life assessment method comprises the following specific steps that 1, determining weak links of the fatigue life of an expansion joint product, corresponding failure mechanisms and sensitive factors influencing the fatigue life; step 2, performing nonlinear simulation analysis and fatigue life analysis, and establishing a finite element model of the expansion joint; step 3, determining key parameters influencing the fatigue life of the expansion joint according to the sensitive factors determined in the step 1; carrying out statistical distribution fitting on each key parameter by applying an actual measurement value, and finishing multiple random sampling of the key parameters by adopting a Monte Carlo important sampling method; and 4, evaluating the reliability fatigue life of the expansion joint, inputting sample parameters obtained after multiple times of random sampling into the established expansion joint finite element model, carrying outstatistical distribution fitting on a fatigue life analysis result, and obtaining the reliability fatigue life of the expansion joint under a given confidence coefficient.

Description

technical field [0001] The invention belongs to the technical field of mechanical equipment reliability and life prediction, and in particular relates to a method for evaluating fatigue life of expansion joint reliability. Background technique [0002] Expansion joints, as a key component of UHV transmission lines, are mainly used to compensate the expansion and contraction deformation of pipelines due to temperature changes, and are also used for length compensation of pipelines due to installation adjustments. There are many structural forms of expansion joints, which can be divided into installation expansion joints and temperature compensation expansion joints according to the conditions of use. Expansion joint. The components of the expansion joint include flanges, bellows, end pipes and support plates, among which the main working parts and weak links are bellows. Under the action of axial force, lateral force and bending moment, large deformation is allowed. In engi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F2119/04G06F30/23
Inventor 孟理华黄爽边智刘昭邵将
Owner CHINA AERO POLYTECH ESTAB
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