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

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...

AI Technical Summary

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

Images