Method for calculating buckling propagation pressure of deep sea pipeline based on plate-shell theory

Abstract

The invention discloses a method for calculating the buckling propagation pressure of a deep sea pipeline based on a plate-shell theory. The method comprises the specific steps of measuring the radiusR and the wall thickness t of the deep sea pipeline; measuring the tensile stress-strain relationship of the deep sea pipeline material, and fitting by using the linear hardening elastic-plastic constitutive relationship to obtain the yield strength sigma s and the linear hardening modulus E1; calculating a yield influence coefficient my, a strain hardening coefficient mh and a film stretching factor n; and calculating the buckling propagation pressure of the deep sea pipeline through a buckling propagation pressure calculation formula. Based on the plate-shell theory, the influence of the thin film stretching effect of the shell structure in the buckling propagation process is considered, the buckling propagation phenomenon of the deep sea pipeline is integrally analyzed, and a more accurate and more reasonable buckling propagation pressure calculation method is provided.

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...

AI Technical Summary

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

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