Comparative analysis of eddy current pulsed thermography and long pulse thermography for damage detection in metals and composites. (October 2019)

• Record Type: Journal Article
• Authors: Wang, Zijun; Zhu, Junzhen; Tian, GuiYun; Ciampa, Francesco
• Is Part Of: NDT & E international. Volume 107(2019)
• Publication Date: 2019-10
• Subjects: Eddy current pulsed thermography -- Long pulse thermography -- Flat bottom hole -- Principal component analysis; Nondestructive testing -- Periodicals; Contrôle non destructif -- Périodiques; Electronic journals; 620.1127
• DOI: 10.1016/j.ndteint.2019.102155
• Languages: English
• ISSNs: 0963-8695

Abstract

Abstract: Eddy current pulsed thermography (ECPT) and long pulse thermography (LPT) are two emerging non-destructive evaluation techniques that have been recently used for sub-surface defect detection in both metallic and composite components. This paper provides a comparative analysis of these two methods by focussing on the detection of flat bottom holes (FBHs) in both aluminium and carbon fibre reinforced plastic samples. Principal component analysis was used for the post-processing of thermal data in order to enhance the detection of FBHs with various diameters and depths. Results showed that LPT had a better performance for detecting FBHs in low-thermally conductive materials such as carbon fibre-reinforced thermoplastic composites, whilst ECPT revealed a superior performance for detecting FBHs in materials with higher thermal and electrical conductivity such as aluminium.