Metal stress corrosion image testing method

A technology of image testing and metal stress, which is applied in testing wear resistance, elastic testing, and testing material strength by applying a stable bending force, and can solve problems such as inability to monitor local strain evolution laws

Inactive Publication Date: 2020-06-16
TIANJIN UNIV OF COMMERCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention can solve the problem that the local strain evolution law cannot be monitored in the metal stress corrosion process, and provides a metal stress corrosion detection method capable of monitoring the local strain evolution law in the metal stress corrosion process

Method used

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  • Metal stress corrosion image testing method

Examples

Experimental program
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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] Such as figure 1 As shown, the metal bending stress corrosion image test experimental device mainly includes: metal sample 1, bending stress loading fixture 2, first hexagon socket bolt 3, second socket bolt 4, corrosion solution 5, rectangular parallelepiped glass container 6, second Support 7, the second CCD camera 8, the second computer 9, the first computer 10, the first CCD camera 11, the first support 12, the experiment table 13 etc., the concrete experiment process is as follows:

[0025] 1. Process the metal sample into a standard style that can be installed and fixed by the stress loading fixture, monitor the upper surface (the area where the maximum elastic tensile stress is located after the bending stress of the metal sample is loaded), polish and corrode the metallographic structure, and monitor the spray spot treatment on the side;

[0026] 2. Bui...

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Abstract

The invention discloses a metal stress corrosion image testing method, which comprises the following steps of: carrying out polishing corrosion treatment on the monitored upper surface of metal, and carrying out spot spraying treatment on the monitored side surface; building a stress corrosion measurement system; installing a metal sample to a bending stress loading clamp; placing the bending stress loading clamp in a liquid container of an image acquisition region; enabling the metal sample to generate elastic deformation, acquiring surface images of a monitoring region before and after the metal sample is loaded and inputting the surface images into a computer by using image acquisition equipment; pouring a transparent corrosive solution into the liquid container, and inputting an imageinto the computer by using the image acquisition equipment; and calculating, analyzing and summarizing an evolution law of the surface strain of the monitoring region of the metal sample through adopting a digital image correlation method. The metal stress corrosion image testing method is suitable for stress corrosion detection of various materials.

Description

technical field [0001] The invention belongs to the technical field of corrosion detection, and in particular relates to a metal stress corrosion detection method based on digital image correlation. Background technique [0002] The stress corrosion behavior of metal materials in soil and rivers is of great significance to the safe use of metal materials. Commonly used standard stress corrosion experiments mainly include three loading methods: constant load, constant strain, and slow strain rate. For constant strain loading, the given strain value is usually calculated according to the boundary conditions by using the formula of material mechanics, or the method of sticking strain gauges is used to Test for a given strain value. In fact, the local stress corrosion of metal materials is often caused by the inhomogeneity of the material microstructure. There is a large gap between the strain value of the stress corrosion cracking area calculated by the formula of material mec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/56G01N3/20G01M5/00G01N21/84G01N17/00
CPCG01N3/56G01N3/20G01M5/005G01N21/84G01N17/006G01N2203/0023G01N2203/0075G01N2203/0641G01N2203/024
Inventor 乔志霞赵倩张海军梁艳书郭桂梅
Owner TIANJIN UNIV OF COMMERCE
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