Square pulse heating infrared thermography and shearography applied simultaneously on CFRP tissue bonded to reinforced concrete

Abstract

This study concern the use of a common thermal excitation for infrared thermography and shearographic measurements. The two NDT methods are used simultaneously to detect defects in the bonding between a concrete slab and a tissue of carbon fiber reinforced polymer (CFRP). Experimentation was conducted to evaluate defects depending on their size and simulated bonding quality. A numerical model was designed according to the experimental conditions. Obtained simulated results were compared with experimental data that allowed the validation of the numerical model. Analysis of the results shed some light on the relation between the thermal and mechanical response on defective samples.

Quantitative evaluation of debond in concrete-filled steel tubular member (CFSTM) using piezoceramic transducers and ultrasonic head wave amplitude

“…At present, nondestructive testing (NDT) techniques, including ultrasonic guided waves [9][10][11][12][13][14][15], electromagnetic waves (EW) [16,17], acoustic emission [18][19][20][21][22][23][24], infrared thermal imaging [25][26][27][28], fiber optic sensors [29][30][31][32][33][34][35], x-ray diffraction [36] and radar/microwave [37][38][39], are effective in structural damage detection. Although these methods can reflect the local damage state of the structure, they require complex and expensive instrument and professional interpretation, which makes it difficult to carry out real-time and on-line structure health monitoring.…”