Multi-layer non-adhesive flexible pipe flexural behavior fast evaluation method

Abstract

The invention provides a multi-layer non-adhesive flexible pipe flexural behavior fast evaluation method. The method comprises the steps of utilizing a special measuring tool to measure a structural parameter of a multi-layer non-adhesive flexible pipe, determining a mechanical parameter of materials adopted by all functional layers of the multi-layer non-adhesive flexible pipe through a material tensile experiment, conducting mesh dividing on a three-dimensional geometric model of the multi-layer non-adhesive flexible pipe with the help of finite element preprocessing software, considering intra-layer and inter-layer friction contact, establishing a flexible pipe three-dimensional finite element model, and utilizing nonlinear finite element analysis software ABAQUS to calculate so as to obtain stress characteristics of the multi-layer non-adhesive flexible pipe under the action of bending moment. Based on von Mises stress peak values of all the functional layers and corresponding material yield strength of all the functional layers, safety coefficients of all the functional layers under a current load working condition are determined by calculating, and with the minimum value of the safety coefficients of all the functional layers being the basis, the aim of quickly evaluating a flexural behavior of the multi-layer non-adhesive flexible pipe is achieved. The multi-layer non-adhesive flexible pipe flexural behavior fast evaluation method has very significant importance in recognizing a stress distribution characteristic of the multi-layer non-adhesive flexible pipe, clarifying the flexural behavior of the multi-layer non-adhesive flexible pipe and guaranteeing work safety.

Description

technical field [0001] The invention relates to the technical field of oil field drilling, in particular to a method for quickly evaluating the bending resistance of a multilayer non-bonding flexible pipe. Background technique [0002] Unbonded flexible pipelines are essential equipment in the exploitation of offshore oil and gas resources. With the continuous advancement of human beings into the deep sea, the marine environment they face is getting worse and worse, and the bending loads on flexible pipelines are also increasing. . In order to ensure that flexible pipe can meet the harsh service environment, its bending resistance should be evaluated before use. [0003] Full-scale physical experiment is a reliable method to evaluate the comprehensive mechanical properties of flexible pipes. However, it is expensive, takes a long time, and cannot intuitively reflect the internal force characteristics of flexible pipes under complex loads. Using numerical simulation to eval...

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Problems solved by technology

However, the structural analysis of unbonded flexible pipes is very complicated. The models used by most researchers either greatly simplify the model, or do not consider the characteristics of frictional contact between layers, so there is a certain gap between the obtained results and the real force characteristics of flexible pipes.

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