Method for rapidly evaluating ultimate bending performance of multilayer non-sticky marine flexible pipe

A technology for marine flexible pipes and evaluation methods, which is applied in the field of rapid evaluation of the ultimate bending performance of multilayer unbonded marine The gap between the actual force characteristics of the pipeline and the failure to consider the frictional contact characteristics between layers, etc.

Inactive Publication Date: 2018-01-16
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 bending performance of multilayer non-sticky marine flexible pipe
  • Method for rapidly evaluating ultimate bending performance of multilayer non-sticky marine flexible pipe
  • Method for rapidly evaluating ultimate bending performance of multilayer non-sticky 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 invention provides a method for rapidly evaluating the ultimate bending performance of a multilayer non-sticky marine flexible pipe. The method comprises the following steps: measuring the structure parameters of a multilayer non-sticky flexible pipe; determining the mechanical parameters of the material used by each functional layer of the multilayer non-sticky flexible pipe; carrying out mesh generation on a three-dimensional geometric model of the multilayer non-sticky flexible pipe; establishing a three-dimensional finite element calculation model of the flexible pipe by considering intra-layer and inter-layer frictional contact; getting the stress distribution characteristics of the multilayer non-sticky flexible pipe under the action of bending moment through calculation; calculating and determining the safety coefficient of each functional layer under the current load condition on the basis of the von Mises stress peak value of each functional layer and the material yield strength corresponding to each functional layer, and taking the minimum safety coefficient among the safety coefficients of the functional layers as the bending safety coefficient of the flexible pipe;and gradually applying a bending moment until the bending safety coefficient of the multilayer non-sticky flexible pipe is reduced to 1, and getting the ultimate bending state of the multilayer non-sticky flexible pipe. Through the method, the ultimate bending performance of a multilayer non-sticky flexible pipe can be evaluated rapidly.

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 bending resistance 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. Bending loads are also increasing. In order to ensure that the marine flexible pipe can meet the harsh service environment, its bending resistance 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 perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06F17/50
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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