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Quantification Research for Steel and Aluminum Plate with Infrared Detection

Author: SunChunQing
Tutor: Shi
School: Hunan University of Science and Technology
Course: Mechanical Engineering
Keywords: infrared nondestructive testing quantitative calculation simulation analysis ANSYS
CLC: TG115.2
Type: Master's thesis
Year: 2011
Downloads: 27
Quote: 0
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Abstract


Infrared nondestructive testing is an emerging technology in the NDT methods, which has a unique advantage. In detection work with infrared nondestructive testing technology can’t need contact with the measured parts directly and only need a short time for one testing, and also testing results displayed in the form of infrared thermal images that are very intuitive. Infrared nondestructive testing is based on the thermo physical properties of the measured object and the heat transfer theory, and collected surface infrared radiation of measured object is converted visible thermography through thermal infrared imager, after feature analysis of thermography can further judge whether there are internal defects in the measured object. Infrared nondestructive testing technology have very broad application prospect on the internal defects testing of the measured object, but this technology is in the primary stage of study, and theory of quantitative testing is still immature. Therefore, infrared nondestructive testing study on the application of defects quantitative aspects has very important significance.Taking carbon steel plate as the research object, defect depth and shape quantitative testing issue in infrared nondestructive testing are mainly studied. The completed work is as follows:1、General situation of the present nondestructive testing technology as well as its basic principle are expounded. Three influence factors of infrared nondestructive testing results: heat source, thermal infrared imager, and measured object are analyzed and illustrated.2、Heat transfer physical and mathematical model of flat test specimen with internal defects are established by adopting basic theory of heat transfer, defects in different depth and diameter are simulated and theoretical calculation, computing method of defects depth is obtained.3、Numerical simulation test of the measured test specimen with internal irregular defects by using ANSYS in the case of known depth defects, shape of internal defects is calculated quantitatively by adopting the conjugate gradient method, and also the conjugate gradient method is optimized by utilizing the image edge detection technology. The calculated results show that this method can provide theoretical basis for the quantitative study of infrared nondestructive testing.4、Experimental data of infrared nondestructive testing is checked, the analysis of the experimental data show that methods used in this paper can conduct quantitative calculation on internal defects size of the measured object by according to the results of infrared nondestructive testing.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallurgy ( Physical Metallurgy ) > Analytical tests of the metal (Metal Testing and Materials ) > Physical test method
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