CN-121997506-A - Hydrogen damage assessment method, device, equipment and medium for girth weld of high-grade steel pipeline

CN121997506ACN 121997506 ACN121997506 ACN 121997506ACN-121997506-A

Abstract

The embodiment of the application provides a hydrogen damage assessment method, a device, equipment and a medium for girth welds of high-grade steel pipelines. The method comprises the steps of firstly determining hydrogen concentration data and stress data when hydrogen diffuses in a girth joint of a high-grade steel pipeline to be processed, then determining a coupling relation between hydrogen diffusion and stress according to the hydrogen concentration data, the stress data and a preset damage coupling model, and finally evaluating hydrogen damage of the girth joint of the high-grade steel pipeline to be processed by adopting a finite element method based on the coupling relation to determine damage information. According to the method, the safety assessment of the pipeline girth weld in the hydrogen-lacking environment in the prior art is considered, the damage coupling model corresponding to the high-steel-grade pipeline girth weld fracture damage mechanism in the hydrogen environment in which the hydrogen medium and the complex stress state are considered is established, the hydrogen diffusion and the stress of the girth weld can be analyzed, the programming of the hydrogen damage mechanism is realized by combining the finite element user dynamic subroutine, and the support is provided for accurately assessing the hydrogen damage information of the girth weld.

Inventors

ZHANG DONG
LIU XIAOBEN
ZHANG HAN
HE ZHIQIANG
GONG YU

Assignees

中国石油大学(北京)

Dates

Publication Date: 20260508
Application Date: 20260105

Claims (10)

1. The hydrogen damage assessment method for the girth weld of the high-grade pipeline is characterized by comprising the following steps of: determining hydrogen concentration data and stress data when hydrogen diffuses in the girth weld of the high-grade steel pipeline to be treated; Determining a coupling relationship between hydrogen diffusion and stress according to the hydrogen concentration data, the stress data and a preset damage coupling model; Based on the coupling relation, the hydrogen damage of the girth weld of the high-grade steel pipeline to be treated is evaluated by adopting a finite element method, and damage information is determined.
2. The method of claim 1, wherein determining the coupling relationship between hydrogen diffusion and stress based on the hydrogen concentration data, the stress data, and a predetermined damage coupling model comprises: Determining a first association relationship between the hydrogen concentration and the stress according to the hydrogen concentration data and a preset hydrogen diffusion equation, wherein the preset hydrogen diffusion equation is derived based on a mass conservation law and by introducing a preset stress parameter item; determining a second association relationship between the hydrogen concentration and the stress damage according to the stress data and a preset hydrogen damage equation, wherein the preset hydrogen damage equation is derived based on a material damage theory of introducing hydrogen; and determining the coupling relation between hydrogen diffusion and stress according to the first association relation, the second association relation and a preset damage coupling model.
3. The method of claim 2, wherein prior to said determining a first correlation between hydrogen concentration and stress based on said hydrogen concentration data and a preset hydrogen diffusion equation, the method further comprises: acquiring lattice hydrogen concentration and capture hydrogen concentration of the girth weld of the high-grade steel pipeline to be treated; the hydrogen concentration data is determined from the lattice hydrogen concentration and the trapped hydrogen concentration.
4. The method of claim 3, wherein determining a first correlation between hydrogen concentration and stress based on the hydrogen concentration data and a preset hydrogen diffusion equation comprises: acquiring trap binding energy of the girth weld of the high-grade steel pipeline to be treated; Determining a third association between the lattice hydrogen concentration and the trapped hydrogen concentration according to the trap binding energy; And determining a first association relationship between the hydrogen concentration and the stress according to the hydrogen concentration data, the third association relationship and a preset hydrogen diffusion equation.
5. The method of claim 3 or 4, wherein determining a second correlation between hydrogen concentration and stress damage based on the stress data and a predetermined hydrogen damage equation comprises: obtaining stress data of the girth weld of the high-grade steel pipeline to be processed, wherein the stress data comprises equivalent plastic strain data and three-dimensional stress components; Determining hydrostatic stress data according to the three-dimensional stress components; substituting the lattice hydrogen concentration, the trapped hydrogen concentration, the equivalent plastic strain and the hydrostatic stress data into a preset hydrogen damage equation to determine stress damage data; and determining a second association relationship between the hydrogen concentration and the stress damage according to the stress damage data and the hydrogen concentration data.
6. The method of claim 5, wherein the method further comprises: Acquiring the hydrostatic stress data, the lattice hydrogen concentration, and the trapped hydrogen concentration based on a finite element user dynamic subroutine; substituting the hydrostatic stress data, the lattice hydrogen concentration and the trapped hydrogen concentration into the preset hydrogen diffusion equation and the preset hydrogen damage equation respectively, and updating the first association relation and the second association relation.
7. A hydrogen damage assessment device for girth welds of high-grade steel pipelines, comprising: the determining module is used for determining hydrogen concentration data and stress data when hydrogen diffuses in the girth weld of the high-grade steel pipeline to be processed; The processing module is used for determining the coupling relation between hydrogen diffusion and stress according to the hydrogen concentration data, the stress data and a preset damage coupling model; And the evaluation module is used for evaluating the hydrogen damage of the girth weld of the high-grade steel pipeline to be processed by adopting a finite element method based on the coupling relation and determining damage information.
8. An electronic device is characterized by comprising a memory and a processor; The memory stores computer-executable instructions; the processor executing computer-executable instructions stored in the memory, causing the processor to perform the method of any one of claims 1-6.
9. A computer readable storage medium having stored therein computer executable instructions which when executed by a processor are adapted to carry out the method of any one of claims 1-6.
10. A computer program product comprising a computer program which, when executed by a processor, implements the method of any of claims 1-6.

Description

Hydrogen damage assessment method, device, equipment and medium for girth weld of high-grade steel pipeline Technical Field The application relates to the technical field of oil and gas pipeline transportation, in particular to a hydrogen damage assessment method, a device, equipment and a medium for girth welds of high-grade steel pipelines. Background The girth weld of the high-grade steel pipeline is used as a key connecting part of the hydrogen-doped natural gas pipeline, the metallographic structure is complex, microscopic defects such as cracks, incomplete welding, misplacement and the like exist, and hydrogen atoms enter the girth weld material of the high-grade steel pipeline and are coupled with a stress field in a hydrogen-doped environment, so that the girth weld is easily cracked, and the safety of the pipeline is threatened. Therefore, a need exists for simulated evaluation of fracture behavior of hydrogen-loaded natural gas pipeline girth welds. The existing method mainly simulates hydrogen induced fracture behaviors through a multi-scale modeling method, such as a cohesive force model simulates a crack expansion process through defining a damage evolution law of a crack tip, a phase field model simulates nucleation and expansion of a hydrogen induced crack through constructing a multi-field coupling equation comprising a displacement field, a phase field and a hydrogen concentration field, and a hole damage (GTN) model describes a ductile fracture process of a material through introducing a void volume fraction. However, the existing method has the problem of insufficient accuracy of damage assessment of hydrogen induced fracture. Disclosure of Invention The embodiment of the application provides a hydrogen damage assessment method, a device, equipment and a medium for a girth weld of a high-grade steel pipeline, which are used for achieving the effect of improving the accuracy of hydrogen damage assessment of the girth weld of the pipeline. In a first aspect, an embodiment of the present application provides a hydrogen damage assessment method for a girth weld of a high-grade steel pipeline, including: determining hydrogen concentration data and stress data when hydrogen diffuses in the girth weld of the high-grade steel pipeline to be treated; Determining a coupling relationship between hydrogen diffusion and stress according to the hydrogen concentration data, the stress data and a preset damage coupling model; Based on the coupling relation, the hydrogen damage of the girth weld of the high-grade steel pipeline to be treated is evaluated by adopting a finite element method, and damage information is determined. In one or more embodiments, the determining the coupling relationship between hydrogen diffusion and stress according to the hydrogen concentration data, the stress data, and a preset damage coupling model includes: Determining a first association relationship between the hydrogen concentration and the stress according to the hydrogen concentration data and a preset hydrogen diffusion equation, wherein the preset hydrogen diffusion equation is derived based on a mass conservation law and by introducing a preset stress parameter item; determining a second association relationship between the hydrogen concentration and the stress damage according to the stress data and a preset hydrogen damage equation, wherein the preset hydrogen damage equation is derived based on a material damage theory of introducing hydrogen; and determining the coupling relation between hydrogen diffusion and stress according to the first association relation, the second association relation and a preset damage coupling model. In one or more embodiments, before the determining the first correlation between the hydrogen concentration and the stress according to the hydrogen concentration data and a preset hydrogen diffusion equation, the method further includes: acquiring lattice hydrogen concentration and capture hydrogen concentration of the girth weld of the high-grade steel pipeline to be treated; the hydrogen concentration data is determined from the lattice hydrogen concentration and the trapped hydrogen concentration. In one or more embodiments, the determining the first correlation between the hydrogen concentration and the stress according to the hydrogen concentration data and a preset hydrogen diffusion equation includes: acquiring trap binding energy of the girth weld of the high-grade steel pipeline to be treated; Determining a third association between the lattice hydrogen concentration and the trapped hydrogen concentration according to the trap binding energy; And determining a first association relationship between the hydrogen concentration and the stress according to the hydrogen concentration data, the third association relationship and a preset hydrogen diffusion equation. In one or more embodiments, the determining the second association relationship between the hydrogen concentration and