Reconstruction of Stress Corrosion Cracking Based on a Regularization Method Using Multi-Frequency Eddy Current Signals

摘要

Stress corrosion cracking (SCC) is a prolong breakdown phenomena that occurs in several metal materials and may cause catastrophic accidents. Quantitative nondestructive testing of SCC is important in guaranteeing safety and highly efficient operation in large mechanical systems. However, reconstruction of SCC using eddy current testing (ECT) signals remains a problem given the complicated microstructure of SCC and the ill-posedness of the inverse problem. In this study, the relation between crack parameters and multi-frequency ECT signals is investigated; a regularization method that uses multi-frequency ECT signals is used to reduce the ill-posedness of SCC reconstruction. Conclusions are verified with simulated ECT signals from different conductive crack models.