This study aims to detect, localize, and assess the severity of barely visible indentation damage in a composite sandwich structure using ultrasonic guided waves. A quasistatic loading was gradually applied on a specimen of carbon fiber reinforced epoxy resulting in dents on the surface. Lamb-wave measurements, from a sensor network mounted on the panel's surface, were taken for the intact condition and three damage cases (0.2, 0.5, and 2.7-mm dents). Three approaches were adopted to define the damage indices (DIs) toward anomaly detection, namely, amplitude variation, symbolic dynamics, and root mean square deviation. Data fusion was performed between measurements from multiple excitation frequencies for single and multiple DIs, where the anomaly combination between all the frequencies and the DIs was called a total anomaly. An imaging algorithm was implemented for damage localization in conjunction with single and combined DIs. It was shown that combining the effects of different frequencies and/or different DIs increases the robustness and consistency of the damage detection and localization process. Moreover, a distance-based classification technique was applied using features from single DIs and the combined anomaly measure. Accuracies higher than 91% were attained for the majority of the cases tested.
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August 2019
Research-Article
Robust Localization and Classification of Barely Visible Indentations in Composite Structures by Fusion of Ultrasonic Damage Indices
Mohammad Ali Fakih,
Mohammad Ali Fakih
Laboratory of Smart Structures and Structural Integrity (SSSI),
Department of Mechanical Engineering,
Beirut 1107 2020,
e-mail: mhf17@mail.aub.edu
Department of Mechanical Engineering,
American University of Beirut
,Beirut 1107 2020,
Lebanon
e-mail: mhf17@mail.aub.edu
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Samir Mustapha,
Samir Mustapha
1
Laboratory of Smart Structures and Structural Integrity (SSSI),
Department of Mechanical Engineering,
Beirut 1107 2020,
e-mail: sm154@aub.edu.lb
Department of Mechanical Engineering,
American University of Beirut
,Beirut 1107 2020,
Lebanon
e-mail: sm154@aub.edu.lb
1Corresponding author.
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Ali Abdul-Aziz
Ali Abdul-Aziz
Search for other works by this author on:
Mohammad Ali Fakih
Laboratory of Smart Structures and Structural Integrity (SSSI),
Department of Mechanical Engineering,
Beirut 1107 2020,
e-mail: mhf17@mail.aub.edu
Department of Mechanical Engineering,
American University of Beirut
,Beirut 1107 2020,
Lebanon
e-mail: mhf17@mail.aub.edu
Samir Mustapha
Laboratory of Smart Structures and Structural Integrity (SSSI),
Department of Mechanical Engineering,
Beirut 1107 2020,
e-mail: sm154@aub.edu.lb
Department of Mechanical Engineering,
American University of Beirut
,Beirut 1107 2020,
Lebanon
e-mail: sm154@aub.edu.lb
Ali Abdul-Aziz
1Corresponding author.
Manuscript received March 29, 2019; final manuscript received June 27, 2019; published online July 16, 2019. Assoc. Editor: Wieslaw Ostachowicz.
ASME J Nondestructive Evaluation. Aug 2019, 2(3): 031004 (12 pages)
Published Online: July 16, 2019
Article history
Received:
March 29, 2019
Revision Received:
June 27, 2019
Accepted:
June 27, 2019
Citation
Fakih, M. A., Mustapha, S., and Abdul-Aziz, A. (July 16, 2019). "Robust Localization and Classification of Barely Visible Indentations in Composite Structures by Fusion of Ultrasonic Damage Indices." ASME. ASME J Nondestructive Evaluation. August 2019; 2(3): 031004. https://doi.org/10.1115/1.4044177
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