Method for constructing damage structure finite element model based on actually measured pitting corrosion data

A finite element and pitting technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as unrealizable, high cost of pitting damage, etc., and achieve a more universal effect

Active Publication Date: 2019-10-15
JIANGSU UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

At the same time, the evolution of pit size and shape is affected by the complex electrochemical behavior of pitting, which has strong randomness
Accurately characterizing a structure's pitting damage is costly and sometimes impossible for broad engineering structural performance assessments

Method used

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  • Method for constructing damage structure finite element model based on actually measured pitting corrosion data
  • Method for constructing damage structure finite element model based on actually measured pitting corrosion data
  • Method for constructing damage structure finite element model based on actually measured pitting corrosion data

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Embodiment Construction

[0044] Below in conjunction with the accompanying drawings, a simple pitting damaged flat plate is taken as an example, and the finite element software adopts ANSYS to further describe the present invention in detail.

[0045] A method for constructing a finite element model of a damaged structure based on measured pitting data, specifically comprising the following steps:

[0046] Step 1: According to the measured number of pits 82, the average pit radius of 20.1mm, the average pit depth of 9.62mm, the maximum and minimum radius of 44.03mm and 8.64mm, and the maximum and minimum depth of 10.77mm and 6.66mm, Generate a set of depth data conforming to random normal distribution in EXCEL (with 9.62mm as the mean, 0.5 as the standard deviation, the function used: NORMINV(RAND(), 9.62, 0.5)), the specific generation method is as follows:

[0047] (1) Generate the random depth d of the nth (n starts from 1) point pit i (i=n).

[0048] (2) Judgment d i Whether it is greater than ...

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Abstract

The invention discloses a method for constructing a damage structure finite element model based on actually measured pitting corrosion data. The method is suitable for various structures such as a flat plate and a cylindrical shell. The method comprises the following steps: firstly, generating a group of pseudo-random cylindrical pitting pits conforming to actual measurement statistical characteristics by utilizing a random number method according to pitting statistical data, and randomly endowing the cylindrical pitting pits with random numbers representing shapes; secondly, establishing a geometric model of the structure, and arranging a pitting corrosion pit; before the pitting pits are arranged, changing the shapes of the pitting pits according to the shape random numbers; then, carrying out Boolean operation on the pitting corrosion pit model and the structure geometric model, and constructing a random pitting corrosion geometric form in the structure geometric model; and finally,performing finite element mesh generation to obtain a finite element model of the damaged structure. The invention provides a method for simulating random pitting corrosion in a random pitting corrosion damage structure, which constructs a finite element analysis model of the structure based on statistical data of actually measured pitting corrosion, and the method can be used for accurately evaluating the structural performance.

Description

technical field [0001] The invention belongs to the technical field of numerical model construction, and in particular relates to a method for constructing a finite element model of a damaged structure based on statistical data of measured pitting corrosion, which is applicable to various structures such as flat plates and cylindrical shells. Its characteristic is that it can simulate the random state of size, shape and distribution position of pitting pits according to the statistical data of random pitting. This method can be used to accurately assess the performance degradation of pitting damaged structures, and can also be used in other research work related to the effects of pitting corrosion. Background technique [0002] Pitting corrosion is mainly due to the inhomogeneity of defects, impurities and solutes in the metal material. Although pitting corrosion causes little loss of metal volume, the corrosion rate is very fast. In severe cases, it can cause equipment per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 王仁华林首屹
Owner JIANGSU UNIV OF SCI & TECH
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