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A calculation method based on the pressure of deep -sea pipelines based on plate shell theory

A calculation method, technology of plate and shell theory, applied in calculation, computer-aided design, design optimization/simulation, etc., can solve problems such as buckling propagation pressure error of deep-sea pipelines, ring segmentation theory, split structure integrity, etc., to simplify the calculation process Effect

Active Publication Date: 2022-04-08
JINAN UNIVERSITY
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Problems solved by technology

Although it is reasonable to a certain extent, the theory of ring segmentation splits the integrity of the structure, and there is a certain error in the prediction of the buckling propagation pressure of deep-sea pipelines

Method used

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  • A calculation method based on the pressure of deep -sea pipelines based on plate shell theory
  • A calculation method based on the pressure of deep -sea pipelines based on plate shell theory
  • A calculation method based on the pressure of deep -sea pipelines based on plate shell theory

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Embodiment

[0034] as attached figure 1 As shown, the present embodiment discloses a method for calculating the buckling propagation pressure of a deep-sea pipeline based on the plate and shell theory, and the theoretical calculation method for the buckling propagation pressure includes the following steps:

[0035] S1. Measure the geometric parameters of the deep-sea pipeline. In this embodiment, the geometric parameters of the deep-sea pipeline include at least the radius R of the deep-sea pipeline and the wall thickness t of the pipeline;

[0036] S2. Using the linear hardening elastoplastic constitutive model to fit the stress-strain curve of the pipeline material to obtain the pipeline material parameters. In this embodiment, the pipeline material parameters at least include elastic modulus E, Poisson's ratio μ, and yield limit σ s , linear hardening modulus E 1 ;

[0037] Linear hardening elastoplastic constitutive model: the continuous stress-strain relationship curve is approxi...

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Abstract

The invention discloses a method for calculating the buckling propagation pressure of a deep-sea pipeline based on the plate and shell theory. The specific steps are: measuring the radius R and wall thickness t of the deep-sea pipeline; The yield strength σ was obtained by fitting the hardening elastoplastic constitutive relation s and linear hardening modulus E 1 ;Calculate yield influence factor m y , Strain hardening coefficient m h and film tension factor n; the buckling propagation pressure of the deep-sea pipeline is calculated by the buckling propagation pressure calculation formula. Based on the plate and shell theory, the present invention considers the influence of the film stretching effect of the shell structure in the buckling propagation process, analyzes the buckling propagation phenomenon of the deep-sea pipeline as a whole, and proposes a more accurate and reasonable buckling propagation pressure calculation method.

Description

technical field [0001] The invention relates to the technical field of failure prediction of deep-sea pipeline structures, in particular to a calculation method for buckling propagation pressure of deep-sea pipelines based on plate and shell theory. Background technique [0002] Deep-sea pipelines are subject to huge hydrostatic pressure, and local buckling is prone to occur under various incentives in the deep-sea complex environment. Once local buckling occurs, it will propagate along the pipeline under certain pressure conditions, and this The pressure value is called the buckling propagation pressure. Since the pressure value of buckling propagation is often lower than that of local buckling, the buckling phenomenon can propagate along the pipeline for a considerable distance and cause serious damage to deep-sea pipelines. [0003] The theoretical calculation methods of buckling propagation pressure at home and abroad often consider the buckling propagation phenomenon o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F119/14G06F113/14
Inventor 薛江红梁浩锋金福松夏飞
Owner JINAN UNIVERSITY
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