Abstract
Large area nondestructive evaluation (NDE) inspections are required for fatigue testing of composite structures to track damage initiation and growth. Of particular interest is the progression of damage leading to ultimate failure to validate damage progression models. In this work, passive thermography and acoustic emission NDE were used to track damage growth up to failure of a composite three-stringer panel. Fourteen acoustic emission sensors were placed on the composite panel. The signals from the array were acquired simultaneously and allowed for acoustic emission location. In addition, real time thermal data of the composite structure were acquired during loading. Details are presented on the mapping of the acoustic emission locations directly onto the thermal imagery to confirm areas of damage growth leading to ultimate failure. This required synchronizing the acoustic emission and thermal data with the applied loading. In addition, processing of the thermal imagery which included contrast enhancement, removal of optical barrel distortion and correction of angular rotation before mapping the acoustic event locations are discussed.
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Acknowledgments
The authors would like to acknowledge Mr. Wade Jackson of NASA Langley for ultrasonic inspections, sample preparation, and mounting. Also the authors would like to acknowledge Mr. William Johnston of Lockheed Martin for testing support and Mr. Kenneth McLarney, NASA Internship, Fellowship, and Scholarships (NIFS) student for data processing.
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Zalameda, J.N., Burke, E.R., Horne, M.R., Madaras, E.I. (2017). Large Area Nondestructive Evaluation of a Fatigue Loaded Composite Structure. In: Quinn, S., Balandraud, X. (eds) Residual Stress, Thermomechanics & Infrared Imaging, Hybrid Techniques and Inverse Problems, Volume 9. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-42255-8_4
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DOI: https://doi.org/10.1007/978-3-319-42255-8_4
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