Session: 10-01: Nonlinear Ultrasonic Techniques for NDE I

Paper Number: 147772

147772 - Debond Identification and Assessment in Frp-Strengthened Rc Structures Using Nonlinear Ultrasonics 

Abstract: 

Debonding failure poses a significant challenge in Fiber Reinforced Polymer (FRP) strengthened RC structures, necessitating regular quantitative assessment for both pre-existing debonds during installation and those occurring over time. This paper proposes a novel debond imaging algorithm based on nonlinear ultrasonics to address this pressing issue. A three-dimensional numerical model of a beam is prepared in ABAQUS to explore the interaction between nonlinear parameters and debonding. The model is validated by comparing the calculated group velocity with the group velocity obtained from the dispersion curve of the  strengthened RC beam. Through comprehensive numerical studies on the validated model, a sensitivity analysis is conducted to compare the accuracy of debond imaging using linear and nonlinear ultrasonic techniques. The results demonstrate the superior efficacy of the proposed methodology in quantitatively assessing debonds of varying sizes and shapes compared to traditional linear ultrasonic methods. Notably, the proposed technique requires fewer sensors, enhancing its practicality and applicability in real-world scenarios. This advancement holds immense promise for enhancing the reliability and efficiency of debonding assessment in FRP-strengthened structures. By enabling early detection and precise characterization of debonding, the proposed algorithm facilitates timely intervention, potentially mitigating catastrophic failures and prolonging the service life of FRP-strengthened RC structures. 

Presenting Author: Sauvik Banerjee Indian Institute of Technology Bombay

Presenting Author Biography: Dr. Sauvik Banerjee is currently a Professor of Structural Engineering in the Department of Civil Engineering, Indian Institute of Technology (IIT) Bombay. Prior to joining IIT Bombay in the year 2008, he had spent three years as an assistant professor at the Parks College of Engineering, Aviation and Technology, Saint Louis University, USA. Dr. Banerjee’s work focuses in the areas of structural health monitoring using wave propagation and vibration-based approaches, ultrasonic nondestructive evaluation of structures, and dynamic modelling of advanced composite structures. He has published over 150 international journal articles and conference proceedings, 1 book, 8 book chapters, and delivered invited talks in several important meetings in these areas. He has served as the Principal Investigator for several sponsored research and industrial consultancy projects worth over $4 million. He has supervised 20 doctoral students and 30 masters students, and several of them have won awards for their research contributions in a variety of forums. Dr Banerjee received Prof. S. P. Sukhatme Award for Excellence in Teaching at IIT Bombay in 2019 and Institute Excellence in Teaching Award in 2013. He is on the editorial boards of the ASME Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems and the Journal of Nondestructive Testing and Evaluation, Taylor and Francis.

Authors:

Udita Pant Indian Institute of Technology Bombay
Sauvik Banerjee Indian Institute of Technology Bombay