Numerical simulation of infrared fast defects detection

SUN Chunqing, SHI Yu
(Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment,
Hunan University of Science & Technology, Xiangtan 411201,China)

Abstract: In order to study the problem of defect depth and shape of infrared nondestructive testing, firstly, heat transfer physical and mathematical model of flat specimens with internal defects was established, simulation analysis and theoretical calculation at different defect depth was carried out, and theoretical calculation methods of defect depth were obtained. Then, simulation experiment on test piece with internal irregular defects was made by applying software of ANSYS under the condition of certain defect depth, quantitative calculation of internal defects in shape was adopted by using conjugate gradient method. Research results show that this research provides theoretical basis for the quantitative study of infrared nondestructive testing.
Key words: infrared nondestructive testing; quantitative calculation; simulation analysis; ANSYS