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

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...

AI Technical Summary

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 the field of visible light, the analysis results are greatly affected by the environment and human beings, with large fluctuations and poor repeatability