Journal
INFRARED PHYSICS & TECHNOLOGY
Volume 58, Issue -, Pages 36-46Publisher
ELSEVIER
DOI: 10.1016/j.infrared.2013.01.004
Keywords
Infrared inspection; Phasegram; Optical step heating thermography; Impact damage; Infrared image processing
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Funding
- Basque Country Regional Ministry of Industry, Innovation, Trade and Tourism under the Project PREDATER from Scientific Technological Agents integrated in the Basque Science, Technology and Innovation Network [SA-2011/00305]
- Basque Country Regional Ministry of Industry, Innovation, Trade and Tourism under the Project DUOMO from Scientific Technological Agents integrated in the Basque Science, Technology and Innovation Network [ER-2010/00047]
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Accidental impacts can severely reduce the structural strength and stability of composite materials, which can lead to severe consequences due to the degradation of the mechanical properties of components designed to perform for decades. Because accidental impacts are difficult to avoid, robust and reliable inspection methods to detect impact damage are required. Many methods have been proposed recently. However, most of them require an experienced technician to analyze the data, which leads to a significant decrease in manufacturing productivity. This work proposes a method to automatically detect impact damage in carbon fiber composites using active thermography. The proposed system detects defects caused by impact damage in the infrared images without human intervention. Impact damage detection is performed using a robust method based on an active thermographic inspection. Thermographic data is preprocessed to improve signal-to-noise ratio and to remove non-uniform background caused by non-uniform heating. Then, peaks and edges are identified and clustered, and regions corresponding to impact damage are detected. The proposed procedure has been applied to three specimens that contain 6 and 12 plies, different types of cores, and damage caused by energies from 6 J to 50 J. All defects are detected correctly. (C) 2013 Elsevier B.V. All rights reserved.
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