<title>Optimization of thermographic NDT using finite element analysis</title>

Abstract

Experimental and analytical methods were used to study heating techniques for infrared thermography inspection of superplastic formed/diffusion bonded (SPFIDB) structural components. Various thermal loads were investigated to determine the parameters required for highest flaw detection sensitivity. Finite element analysis was used to determine optimal heating techniques. According to the analysis, short burst, high intensity heating on the inspection side of the part is required for the highest flaw detection sensitivity. The analytical results were verified using an infrared camera and heat lamps to detect unbonds in four-sheet SPF/DB panels. Good quantitative agreement between the analysis and laboratory experiments was obtained.

Numerical simulation of phase images and depth reconstruction in pulsed phase thermography

“…defect comp resin c omp polymer (15) The resultant defect properties calculated are listed in table 1.…”

“…Various researchers have applied the FE method to simulate the propagation of thermal waves in materials for infrared thermography inspection [7][8][9][10][11][12][13][14][15][16][17][18]. Researchers have used these calculated surface temperatures to verify experimental thermography results [7][8][9][10] and to optimize experimental configurations or limit the number of physical tests necessary [11][12][13][14][15].…”

“…Various researchers have applied the FE method to simulate the propagation of thermal waves in materials for infrared thermography inspection [7][8][9][10][11][12][13][14][15][16][17][18]. Researchers have used these calculated surface temperatures to verify experimental thermography results [7][8][9][10] and to optimize experimental configurations or limit the number of physical tests necessary [11][12][13][14][15]. The challenge to calculating blind frequencies from FE simulations is the high spatial and temporal resolution required to accurately calculate the phase of the propagating waves from the calculated temperature values.…”