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Method for identifying propagation length of metal weld crack

A technology of weld crack and identification method, which is applied in the application of stable tension/pressure testing material strength, special data processing applications, measuring devices, etc. Fiber Bragg grating sensors and other problems, to achieve the effect of increasing monitoring sensitivity and high sensitivity and precision

Active Publication Date: 2021-10-29
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for identifying the crack propagation length of metal welds, which is used to solve the problem that the crack propagation path of metal structure welds varies unevenly along the way, and it is difficult to directly arrange fiber grating sensors and monitor and identify problems

Method used

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  • Method for identifying propagation length of metal weld crack
  • Method for identifying propagation length of metal weld crack
  • Method for identifying propagation length of metal weld crack

Examples

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Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1 provides a kind of identification method of metal weld crack extension length, comprises the following steps:

[0043] Step A: Design of the metal weld crack growth model

[0044] According to the stress and cracking of common welded structures in engineering, refer to figure 1 , place an upright steel plate 200 vertically on a horizontal bottom plate 100, and weld and fix the connection between the steel plate and the bottom plate to form a weld 300, and design a metal weld crack growth model accordingly;

[0045] Step B: using the existing finite element software abaqus to conduct finite element analysis on the metal weld crack growth model to obtain the strain amplitude distribution map;

[0046] Step B1: Size selection of the metal weld crack growth model and weld setting;

[0047] In the finite element analysis, the length, width and thickness of the steel plate 200 are 800×800×0.8 mm, the length, width and thickness of the bottom plate 100 are 1000×...

Embodiment 2

[0073] Example 2: An identification device for the extension length of a metal weld crack

[0074] Embodiment 2 provides an identification device for the extension length of a metal weld crack, including:

[0075] A first processing unit for designing a metal weld crack growth model;

[0076] The second processing unit is used to perform finite element analysis on the metal weld crack growth model by using finite element software to obtain a strain amplitude distribution map;

[0077] The third processing unit is used to calculate the sensing section and its packaging length according to the strain amplitude distribution diagram, and obtain the packaging length of all sensing sections;

[0078] The fourth processing unit is configured to construct a vector array according to the strain amplitude distribution map and the package lengths of all sensing sections, and establish a regression model of the crack growth length of the metal weld;

[0079] The fifth processing unit is...

Embodiment 3

[0080] Embodiment 3: a kind of computer-readable storage medium

[0081] Embodiment 3 provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the steps of the method in Embodiment 1 are implemented.

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Abstract

The invention discloses a method for identifying the propagation length of a metal weld crack. The method comprises the following steps of designing a metal weld crack propagation model, adopting finite element software for conducting finite element analysis on the metal weld crack propagation model, and acquiring a strain amplitude distribution diagram, calculating sensing sections and packaging lengths thereof according to the strain amplitude distribution diagram, and obtaining the packaging lengths of all the sensing sections, constructing a vector array according to the strain amplitude distribution diagram and the packaging lengths of all the sensing sections, and establishing a regression model of the metal weld crack propagation length, and monitoring the propagation of the metal weld crack in real time according to the regression model of the propagation length of the metal weld crack. The invention discloses a method for identifying the crack propagation length of a metal weld crack, which solves the problems that the change of a metal structure weld crack along the on-way crack propagation path is non-uniform, and fiber grating sensors are difficult to directly arrange and monitor and identify.

Description

technical field [0001] The invention relates to structural health monitoring, in particular to a method for identifying the extension length of metal weld cracks. Background technique [0002] Weld cracks are an important type of structural damage. During the crack expansion process, the bearing capacity of the welding position will be reduced and irreversible damage will be caused to the structure after the crack expansion reaches a certain level. The expansion length of the weld crack can be accurately judged in real time. It is of great significance to monitor the crack growth rate and its strain in real time to evaluate whether the structure can serve safely. [0003] The crack growth rate of metal welds is not easy to capture its regularity. At present, in the process of monitoring the crack growth of welds, due to the uneven variation of the crack growth path along the metal structure welds, it is difficult to directly arrange fiber grating sensors, which leads to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01B11/02G01B11/16G06F30/20
CPCG01N3/08G01B11/02G01B11/18G06F30/20
Inventor 韩旭亮武旭邓小康呼文佳谢彬谢文会喻西崇张恩勇
Owner CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD
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