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Finite element numerical simulation and parameter analysis method for fatigue after corrosion of metal material

A metal material, numerical simulation technology, applied in the field of material corrosion, can solve the problems of quantitative analysis of corrosion amount and corrosion morphology of corrosion specimens, inability to obtain corrosion data of metal materials, long time consumption of corrosion and fatigue tests, etc., to improve calculation accuracy and calculation efficiency, avoid poor tetrahedral mesh accuracy, and solve the effect of long corrosion time

Active Publication Date: 2021-07-27
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

[0003] Due to the characteristics of time-consuming corrosion and fatigue tests, large dispersion of test results, and easy to be affected by test conditions, most scholars use finite element numerical simulation methods to analyze the fatigue performance of metal materials after corrosion and study their fatigue performance. It is found that the amount of corrosion of metal materials in a corrosive environment and the surface morphology after corrosion have a great influence on their fatigue performance
However, due to the limited corrosion test time and site conditions, it is impossible to obtain a large amount of corrosion data of metal materials, and it is also impossible to quantitatively analyze the corrosion amount and corrosion morphology of corrosion specimens, and study their influence on the fatigue performance of metal materials after corrosion

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  • Finite element numerical simulation and parameter analysis method for fatigue after corrosion of metal material
  • Finite element numerical simulation and parameter analysis method for fatigue after corrosion of metal material
  • Finite element numerical simulation and parameter analysis method for fatigue after corrosion of metal material

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Embodiment Construction

[0041] The preferred embodiments of the present invention will be further described in detail below.

[0042] A method for finite element numerical simulation and parameter analysis of fatigue after corrosion of metal materials, such as figure 1 shown, which includes:

[0043] First, place the prepared metal material test piece in the marine environment or simulated marine environment for corrosion. After the corrosion test is completed, follow the "Removal of Corrosion Products on Corrosion and Corrosion Test Specimens of Metals and Alloys" (GB / T 16545-2015) According to the requirements in the specification, the corrosion products should be removed from the test pieces of metal materials. Since the corroded morphology of the metal material has a great influence on the fatigue performance of the metal material, in order to ensure the accuracy of the finite element simulation, it is necessary to establish an accurate three-dimensional model of the corroded metal material.

[0...

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Abstract

The invention provides a finite element numerical simulation and parameter analysis method for fatigue of a metal material after corrosion, which comprises the following steps of: scanning an existing corroded metal material test piece to obtain a corrosion three-dimensional digital model, and establishing a three-dimensional coordinate database of corrosion morphology; establishing a random probability model, randomly selecting three-dimensional coordinate points, recombining point clouds, fitting a new corrosion surface, and establishing a new corrosion model; extracting two corrosion surfaces of the obtained new corrosion model, utilizing Hypermesh software to carry out grid division and establishment of a hexahedral grid model, and then combining ABAQUS software and Fe-safe software to carry out fatigue calculation on the corrosion model. By the adoption of the technical scheme, the problems that corrosion and fatigue tests are long in consumed time and large in test result discreteness are effectively solved, time is effectively saved through the finite element fatigue calculation method, and compared with the test result, the fatigue simulation result is accurate and effective.

Description

technical field [0001] The invention belongs to the technical field of material corrosion, in particular to a fatigue finite element numerical simulation and parameter analysis method after metal material corrosion. Background technique [0002] Due to the characteristics of high salt content, high temperature, and high humidity in the marine environment, metal materials usually corrode in the marine environment or offshore environment, thereby reducing the bearing capacity and fatigue strength of the metal material. Under repeated tension, compression, bending and torsion and other fatigue loads, the metal structure will be cracked and damaged. Therefore, it is of great significance and engineering value to study the fatigue performance of metal materials after corrosion. [0003] Due to the time-consuming characteristics of corrosion and fatigue tests, large dispersion of test results, and easy to be affected by test conditions, most scholars use finite element numerical s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17G06F30/23G06T17/20
CPCG06F30/23G06T17/20G06F30/17
Inventor 冯然潘金蒂
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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