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Modeling Ultrasonic NDE and Guided Wave based Structural Health Monitoring

Ravi, Nitin B and Rathod, Vivek T and Chakraborty, Nibir and Mahapatra, Roy D and Sridaran, Ramanan and Boller, Christian (2015) Modeling Ultrasonic NDE and Guided Wave based Structural Health Monitoring. In: Conference on Structural Health Monitoring and Inspection of Advanced Materials, Aerospace, and Civil Infrastructure, MAR 09-12, 2015, San Diego, CA.

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Official URL: http://dx.doi.org/ 10.1117/12.2085000

Abstract

Structural Health Monitoring (SHM) systems require integration of non-destructive technologies into structural design and operational processes. Modeling and simulation of complex NDE inspection processes are important aspects in the development and deployment of SHM technologies. Ray tracing techniques are vital simulation tools to visualize the wave path inside a material. These techniques also help in optimizing the location of transducers and their orientation with respect to the zone of interrogation. It helps in increasing the chances of detection and identification of a flaw in that zone. While current state-of-the-art techniques such as ray tracing based on geometric principle help in such visualization, other information such as signal losses due to spherical or cylindrical shape of wave front are rarely taken into consideration. The problem becomes a little more complicated in the case of dispersive guided wave propagation and near-field defect scattering. We review the existing models and tools to perform ultrasonic NDE simulation in structural components. As an initial step, we develop a ray-tracing approach, where phase and spectral information are preserved. This enables one to study wave scattering beyond simple time of flight calculation of rays. Challenges in terms of theory and modelling of defects of various kinds are discussed. Various additional considerations such as signal decay and physics of scattering are reviewed and challenges involved in realistic computational implementation are discussed. Potential application of this approach to SHM system design is highlighted and by applying this to complex structural components such as airframe structures, SHM is demonstrated to provide additional value in terms of lighter weight and/or longevity enhancement resulting from an extension of the damage tolerance design principle not compromising safety and reliability.

Item Type: Conference Proceedings
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Additional Information: Copy right for this article belongs to the SPIE-INT SOC OPTICAL ENGINEERING, 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
Keywords: SHM; design; life cycle; ultrasonic; NDE; ray-tracing; defects; guided wave; scattering
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering)
Date Deposited: 19 Jul 2015 09:43
Last Modified: 19 Jul 2015 09:43
URI: http://eprints.iisc.ernet.in/id/eprint/51904

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