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Vol.9 No.2previous AASP17 (125-126-127-128-129-130-131-132-133-134-135-136-137-138-139-140-141-142) NT85

Academic Articles
Regular Paper Vol.9 No.2 (2017) p.78 - p.83
 

Quantitative Evaluation of Stress Corrosion Cracking Based on Features of Eddy Current Testing Signals

 
Li WANG1,* and Zhenmao CHEN2
 

1 College of Science, Xi'an University of Posts and Telecommunications, Xi'an, 710121, China
2 State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an, 710049, China

 
Abstract
Stress corrosion cracking (SCC) occurs in several key structural components of nuclear power plants over time. A sufficiently precise quantitative technique is necessary to guarantee the safety and efficient operation of the key structural components when SCC occurs. Quantitative evaluation of SCC profiles using eddy current testing (ECT) signals often underestimates the crack depth due to the local conductive property and the ill-posedness of the inverse problem. In this paper, a quantitative evaluation method based on features of ECT signals is proposed to improve the sizing accuracy of SCC profiles. The proposed strategy includes a numerical SCC model based on the local conductivity distribution, a hybrid inverse strategy combined with the conjugate gradient method and the particle swarm optimization algorithm, and a quantitative evaluation method using features of ECT signals. Reconstruction is conducted with simulated ECT signals from conductive cracks, and the results show that the proposed strategy is effective in improving the sizing precision of SCC profiles.
 
Keywords
eddy current testing, stress corrosion cracking, reconstruction, numerical model, optimization algorithm
 
Full Paper: PDF
Article Information
Article history:
Received 12 October 2016
Accepted 29 May 2017