Computational Methods in Nondestructive Evaluation: a Revolution in Maintenance (postprint)

The primary objective of this research program is to improve the characterization of small discontinuities (cracks, corrosion) using eddy current and ultrasonic methods for complex structures using computational methods in NDE. The research approach concerns the development and validation of efficient 3D models that accurately represent complex eddy current (EC) and ultrasonic (UD inspection problems. Simulated studies can then be used to gain a fundamental understanding of the NDE characterization problem for differentiating and sizing small discontinuities in the presence of coherent noise features present in complex structures. With this understanding and modeling capability, research on novel data analysis and classification methods is conducted exploring multi-dimensional signal processing using data from scanning systems and array sensors and model-based classifiers via inverse methods. The benefits of this program address minimizing costs, minimizing disassembly, improving reliability, and maximizing availability of aircraft. A probabilistic risk analysis method for assessing the value of NDE capabilities in maintenance strategies and the impact ofNDE characteristics on maintenance cost and reliability tradeoffs is also presented.