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Eddy current pulsed thermography for blade edge defect inspection using Helmholtz-coil excitation

Lookup NU author(s): Yunlai Gao, Professor Gui Yun TianORCiD


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© Copyright (2016) by British Institute of Non-Destructive Testing All rights reserved. Natural edge defects characterization of free-form surface structure is challenging for non-destructive testing of metallic materials. This paper investigates an eddy current pulsed thermography (ECPT) technique for edge defects inspection of complex blade structure using Helmholtz-coil excitation. Natural edge defects of a Ti-alloy blade sample are inspected using ECPT and identified by thermal patterns. A thermo-opticalflow (TOF) approach is proposed for thermal transient responses analysis and features extraction to obtain geometry information of natural edge defects as well as microdefects. Experimental studies are implemented for verification of the proposed method following with comparison studies. Results show that micro-defects in early stages and accurate natural edge defects profiles can be identified based on TOF features. Future works including multi-physics based defect quantitative evaluation are discussed.

Publication metadata

Author(s): Ji J, Gao Y, Tian GY

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: 55th Annual Conference of the British Institute of Non-Destructive Testing, NDT 2016

Year of Conference: 2016

Pages: 382-390

Acceptance date: 02/04/2016

Publisher: British Institute of Non-Destructive Testing

Library holdings: Search Newcastle University Library for this item

ISBN: 9781510830943