Method for measuring full-field strain of ultrahigh-temperature object based on digital image correlation method

A technology for digital images and high-temperature objects, which is applied in the direction of measuring force, image enhancement, image analysis, etc.

Pending Publication Date: 2021-01-29
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the problem that the existing technology cannot perform ultra-high temperature (>2000 degrees Celsius) strain measurement

Method used

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  • Method for measuring full-field strain of ultrahigh-temperature object based on digital image correlation method
  • Method for measuring full-field strain of ultrahigh-temperature object based on digital image correlation method
  • Method for measuring full-field strain of ultrahigh-temperature object based on digital image correlation method

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Experimental program
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Embodiment 1

[0046] (1) Select a 50×20×20mm pure tungsten block specimen, one of the 50×20mm surfaces is the surface to be treated, prepare a certain amount of tantalum carbide powder (average particle size 1 micron, purity 99.9%) and a certain amount of Anhydrous ethanol;

[0047] (2) Grinding the surface of the tungsten block, using 800-mesh sandpaper and 1500-mesh sandpaper respectively, and then cleaning the treated surface with alcohol and water, and drying it;

[0048] (3) Take 3 grams of tantalum carbide powder and 6 grams of absolute ethanol, and mix them fully on a tray to form a paste;

[0049] (4) Dip the speckle material mixed in step (3) with the needle tip of the injection needle, manually deposit it on the treated surface, and repeat the above operations to make a randomly distributed high temperature resistant speckle pattern. For large-scale specimens, a high-pressure spray gun can also be used to spray the paste-like tantalum carbide mixture on the surface of the specime...

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Abstract

The invention relates to a method for measuring the full-field strain of an ultrahigh-temperature object based on a digital image correlation method, the temperature application range is normal temperature to 3500 DEG C, and the method comprises the following steps: selecting proper high-temperature-resistant speckle material tantalum carbide powder according to the characteristics of a measured object; polishing a to-be-measured surface of a tungsten test piece to remove an oxide layer; then mixing tantalum carbide (TaC) powder and absolute ethyl alcohol into paste according to the mass ratioof 1: 2; then, manufacturing randomly distributed speckles on the to-be-measured surface treated by the test piece by the mixture, and in order to improve the firmness and the stability of the newlymanufactured speckles, enabling the speckles to be subjected to curing treatment. In order to eliminate the interference of self-illumination of a high-temperature object on strain measurement, the invention provides a double-blue-light filter filtering method, a narrow-band filtering effect is obtained by superposing two blue-light filters, and the influence of strong self-illumination of the high-temperature object on camera imaging is greatly reduced. The method is suitable for ultra-high temperature service materials, such as full-field strain measurement of tungsten materials directly facing plasma parts and divertors in nuclear fusion engineering.

Description

technical field [0001] The invention belongs to the field of high-temperature experimental mechanics and digital image recognition, and specifically relates to a method for measuring the full-field strain of an ultra-high temperature object based on a digital image correlation method, which is applied to ultra-high temperature displacement and displacement in various fields such as nuclear engineering, aerospace, and high-temperature materials. Strain measurement. Background technique [0002] With the rapid development of nuclear engineering, aerospace and other fields, the demand for high-temperature materials is also increasing. Therefore, it is of great significance to study the mechanical properties of these materials in high-temperature environments for the selection and structural design of suitable high-temperature materials. At present, there are mainly two types of methods for strain measurement of materials in ultra-high temperature environments: contact and non-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/02G01N1/28G01B11/16
CPCG01N25/02G01N1/286G01B11/16G01L1/248G01K1/045H04N23/555H04N13/25G06T7/001G06T2207/10012G06T2207/10048G06T2207/30136H04N5/72H04N17/002
Inventor 黄生洪潘志伟蒋梦来郑智风乔美霞
Owner UNIV OF SCI & TECH OF CHINA
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