A detection method of iron body shape based on infrared thermal imaging technology

An infrared thermal imaging and infrared image technology, which is applied in the field of mechanical performance analysis of metal materials, can solve the problems that the analysis results are greatly affected by the environment and human beings, have large fluctuations, and poor repeatability.

Active Publication Date: 2018-11-30
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0005] In the prior art, when using the metal Charpy notch impact test to analyze the metal fracture, because this test method belongs to the analysis in

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Embodiment Construction

[0024] Below in conjunction with embodiment, the present invention is described in detail.

[0025] A method for detecting iron body shape based on infrared thermal imaging technology, comprising the following steps:

[0026] Step 1: Using infrared light to irradiate the fracture of the impact metal sample, and collecting an infrared image of the external appearance of the impact metal sample fracture through a thermal imaging acquisition system;

[0027] Step 2: Find out all the crystallization areas in the infrared image according to the difference between the pixel values ​​of the crystallization area and the toughness area in the infrared image, so as to realize the detection of the external morphology of the fracture of the impact metal sample. The specific steps are as follows:

[0028] Step 21: Calculate the pixel average value of all pixels in the infrared image, and set the pixel average value as a threshold T, wherein the pixels greater than the threshold T belong to...

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Abstract

The invention provides an infrared thermal imaging technology based measurement method, and in particular provides an infrared thermal imaging technology based iron shape detecting method. The methodis characterized in that infrared light transmitted from the surface layer of an impact sample is collected based on the theory that metal materials have thermal radiation difference; different thermal images can be obtained based on different transmitting rates of \ infrared light transmitted from a crystal area and a ductile area; boundary points of the crystal area can be found from the thermalimages, and then a fracture of the impact sample can be measured. According to the method, the thermal imaging treatment technology is carried out; the manual fracture measuring and analyzing operation is replaced by the high-accuracy infrared measuring system based infrared thermal image measuring method, thus the shortage of high influence of the temperature and environment on image collectingof simple CCD cameras can be overcome, and the fracture shape can be measured in metal charpy impact test in the field of metal material test; and meanwhile, the calculated area of the crystal area can be used for measuring the fiber section rate and the side expansion rate of the fracture, drawing a ductile-brittle transformation curve, solving Tk, and measuring the outline dimension of the sample as well as the gap size.

Description

technical field [0001] The invention belongs to the technical field of mechanical performance analysis of metal materials, and in particular relates to an iron body shape detection method based on infrared thermal imaging technology. Background technique [0002] The analysis and measurement technology of fracture morphology in metal Charpy impact test is an important means to test the mechanical properties. Cold brittleness occurs in steel at low temperatures. Cold brittleness is a low-energy fracture condition, which is cleavage fracture or intergranular fracture. The biggest feature of cold and brittle is that the work of breaking is lower than the energy value of the normal design, and the accident happens suddenly, and the consequences are catastrophic. [0003] The measurement parameters of the fracture include: the measurement of the fiber ratio of the section, the measurement of the expansion rate of the fracture side, and the drawing of the ductile-brittle transiti...

Claims

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Application Information

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IPC IPC(8): G01N25/14G01J5/00
CPCG01J5/00G01J2005/0077G01N25/147
Inventor 洪刚夏元清张金会翟弟华周巍松
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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