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Method for calculating stress intensity factor of butt joint circumferential weld crack tip of misaligned pipeline

A stress intensity factor and weld crack technology, which is applied in the field of calculation of the stress intensity factor at the crack tip of the butt girth weld of the pipeline with staggered edges, can solve the problem that the stress intensity factor of the composite defect crack tip cannot be calculated, etc. Regional stress and strain distribution, the effect of clear characterization

Pending Publication Date: 2022-05-31
XIAN UNIV OF TECH
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a calculation method for the stress intensity factor of the crack tip of the butt girth weld of the pipeline with misalignment, which solves the problem that the stress intensity factor of the crack tip of the butt pipeline containing the "misalignment + crack" composite defect cannot be calculated under the existing conditions

Method used

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  • Method for calculating stress intensity factor of butt joint circumferential weld crack tip of misaligned pipeline
  • Method for calculating stress intensity factor of butt joint circumferential weld crack tip of misaligned pipeline
  • Method for calculating stress intensity factor of butt joint circumferential weld crack tip of misaligned pipeline

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Embodiment

[0063] The calculation method of the stress intensity factor of the crack tip of the girth weld of the butt joint of the pipeline with misalignment. Taking a natural gas pipeline as an example, the girth weld defect accounts for the largest proportion of failures. The pipeline material is X80 pipeline steel with an outer diameter of 1422mm ; Among them, the mechanical properties of X80 pipeline steel are shown in Table 1:

[0064] Table 1

[0065]

[0066] The pipe specifications have four wall thicknesses of 17.8 / 21.4 / 25.7 / 30.8mm; the operating internal pressure of the pipe with a wall thickness of 17.8mm is 10Mpa, and the operating internal pressure of other pipes is 12Mpa; various crack sizes have different depth-to-width ratios a / c and The situation of a / t and the situation of buried cracks considering 2a / t are shown in Table 2:

[0067] Table 2

[0068]

[0069] The wall thickness of the pipe used in this example is 21.4mm, the outer diameter of the pipe is 1422mm...

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Abstract

The invention discloses a method for calculating a stress intensity factor of a butt joint circumferential weld crack tip of a misaligned pipeline. The method comprises the following steps: step 1, establishing a geometric model and setting material attributes; step 2, crack and boundary load setting; step 3, dividing a unit grid and setting an output value; 4, submitting and solving the task, and verifying a later finite element; according to the method, a simple method for calculating the stress intensity factor of the butt joint circumferential weld crack tip of the misaligned pipeline can be provided, a method is provided for obtaining the stress intensity factor of the crack tip in real time in engineering, and a new thought can be provided for calculating the stress intensity factor value.

Description

technical field [0001] The invention belongs to the technical field of structural engineering, and relates to a calculation method for the stress intensity factor at the tip of a crack in a butt girth weld of a pipeline with misalignment. Background technique [0002] Oil and natural gas transportation in countries around the world mainly rely on oil and gas pipelines. There are generally a certain number of serious defects in pipelines. Accidents caused by corrosion, cracks and mechanical damage are very frequent every year. Leakage and explosion accidents occur from time to time. The ability to predict accidents is the key to safe and efficient oil and gas transportation. The stress intensity factor at the tip of the crack is one of the criteria for judging pipeline fractures. Therefore, it is necessary to calculate the stress intensity factor of pipelines with defects. There is no corresponding calculation formula for the stress intensity factor of the compound defect of ...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F111/04G06F113/14G06F119/14
CPCG06F30/23G06F2111/04G06F2113/14G06F2119/14Y02P90/30
Inventor 张敏李毅郜雅彦李保铃苟川东高俊雷龙宇
Owner XIAN UNIV OF TECH
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