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Method for rapidly evaluating ultimate tensile performance of multilayered non-bonded marine flexible pipe

A technology of marine flexible pipe and evaluation method, which is applied in the field of rapid evaluation of ultimate tensile performance of multi-layer non-bonded marine flexible pipe, can solve the complex structure analysis of multi-layer non-bonded marine flexible pipe and the multi-layer non-bonded marine flexible pipe. The gap between the real force characteristics of the pipeline and the lack of consideration of the friction and contact characteristics between layers

Inactive Publication Date: 2017-12-22
SHANGHAI UNIV
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Problems solved by technology

However, the structural analysis of multilayer unbonded marine flexible pipelines is very complicated. The models used by most researchers either greatly simplify the model or do not consider the frictional contact characteristics between layers. There is a certain gap in the actual force characteristics of the pipeline

Method used

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  • Method for rapidly evaluating ultimate tensile performance of multilayered non-bonded marine flexible pipe
  • Method for rapidly evaluating ultimate tensile performance of multilayered non-bonded marine flexible pipe
  • Method for rapidly evaluating ultimate tensile performance of multilayered non-bonded marine flexible pipe

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Embodiment Construction

[0028] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0029] Use this evaluation method to evaluate a multi-layer unbonded marine flexible pipe, which includes an inner liner, a compressive armor layer (6 layers), a tensile armor layer (2 layers), a wear-resistant layer, an insulation layer, The middle cladding layer and the outer cladding layer have a total of 13 layers. Such as figure 1 As shown, the specific steps are as follows:

[0030] 1) Measure the structural parameters of multi-layer unbonded marine flexible pipes by using special measuring tools such as internal diameter gauge, disc micrometer, thickness gauge, and image measuring instrument. The main measurement results are shown in Table 1.

[0031] Table 1 Main structural parameters of flexible pipe

[0032]

[0033] 2) Using MTS universal testing machine, density measuring instrument and other special material testing equipm...

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Abstract

The present invention provides a method for rapidly evaluating the ultimate tensile performance of a multilayered non-bonded marine flexible pipe. The method comprises: measuring structural parameters of a multilayered non-bonded flexible pipe, determining mechanical parameters of materials used in each functional layer of the multilayered non-bonded flexible pipe, carrying out mesh generation on a three-dimensional geometric model of the multilayered non-bonded flexible pipe, taking intra-layer and inter-layer frictional contact into consideration, establishing a three-dimensional finite element calculation model of the flexible pipe, and calculating stress distribution characteristics of the multilayered non-bonded flexible pipe under the action of the axial tensile load; based on the peak von Mises stress of each functional layer and the corresponding material yield strength of each functional layer, calculating and determining a safety coefficient of each functional layer under current load conditions, and taking the minimum safety coefficient among various functional layers as the tensile safety coefficient; and gradually applying the axial tensile force until the tensile safety coefficient of the multilayered non-bonded flexible pipe is reduced to 1, and obtaining the ultimate tensile load of the multilayered non-bonded flexible pipe, so that the purpose of rapidly evaluating the ultimate tensile performance of the multilayered non-bonded flexible pipe can be achieved.

Description

technical field [0001] The invention relates to the technical field of offshore oil and gas exploitation and transportation, in particular to a method for quickly evaluating the ultimate tensile performance of a multi-layer non-bonded marine flexible pipe. Background technique [0002] Multi-layer non-bonded marine flexible pipelines are essential equipment for the exploitation and transportation of offshore oil and gas resources. The axial tension is also increasing. In order to ensure that the marine flexible pipe can meet the harsh service environment, its tensile performance should be evaluated before use. [0003] Full-scale physical experiments are a reliable method to evaluate the comprehensive mechanical properties of multi-layer unbonded marine flexible pipelines. However, they are expensive, long-term, and cannot intuitively reflect the internal force characteristics of flexible pipes under complex loads. Using numerical simulation to evaluate the comprehensive p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 狄勤丰陈锋王文昌张鹤陈薇陈洛印吴志浩
Owner SHANGHAI UNIV
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