Modeling ultrasonic NDE and guided wave based structural health monitoring

Nitin B. Ravi; Vivek T. Rathod; Nibir. Chakraborty; D. Roy Mahapatra; Ramanan Sridaran; Christian Boller

doi:10.1117/12.2085000

1 April 2015 Modeling ultrasonic NDE and guided wave based structural health monitoring

Nitin B. Ravi, Vivek T. Rathod, Nibir. Chakraborty, D. Roy Mahapatra, Ramanan Sridaran, Christian Boller

Proceedings Volume 9437, Structural Health Monitoring and Inspection of Advanced Materials, Aerospace, and Civil Infrastructure 2015; 94371V (2015) https://doi.org/10.1117/12.2085000
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2015, San Diego, California, United States

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.

Citation Download Citation

Nitin B. Ravi, Vivek T. Rathod, Nibir. Chakraborty, D. Roy Mahapatra, Ramanan Sridaran, and Christian Boller "Modeling ultrasonic NDE and guided wave based structural health monitoring", Proc. SPIE 9437, Structural Health Monitoring and Inspection of Advanced Materials, Aerospace, and Civil Infrastructure 2015, 94371V (1 April 2015); https://doi.org/10.1117/12.2085000

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KEYWORDS

Ray tracing

Structural health monitoring

Scattering

Waveguides

Nondestructive evaluation

Reflection

Transducers

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