Theoretical Analysis and Numerical Simulation of GFRP Specimens' Defects Detection Using Infrared Thermal Wave Testing Technology Based on Linear Frequency Modulation Excitation

摘要

Theoretical analysis and numerical simulation of GFRP specimens' defects detection using infrared thermal wave testing technology based on linear frequency modulation excitation was carried out in this paper. Based on the theory of heat transfer and material science, the heat transfer model of GFRP specimen was established and analyzed, and the heat transfer process excited by linear frequency modulation excitation heat flow was numerically simulated. Through three-dimensional modeling and finite element analysis, the detection effect of different size defects under experimental conditions was analyzed. By calculating the temperature difference and contrast curve, the influence law of the defect diameter depth ratio on the detection effect was obtained, which can provide a certain reference for the detection test research.