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Спутники
РН
SpaceX
Роскосмос
NASA
СпутникиРНSpaceXРоскосмосNASAPublication date: 14 July 2026
Source: Defect and Diffusion Forum Vol. 453
Author(s): Pusan Dhar, Manoj Rijal, David Amoateng-Mensah, Richard Amevorku, Mannur Sundaresan
Thermoset and thermoplastic composites are extensively used in aerospace because of their exceptional mechanical properties. Compared to thermoset composites, thermoplastic matrix composites offer excellent chemical and physical damage resistance and are more cost-effective to produce. However, barely visible impact damage (BVID) poses a critical risk to thermoplastic Carbon Fiber Reinforced Polymer (CFRP) aerospace structures due to its limited surface manifestation and significant effect on compressive strength. This study presents a thermographic nondestructive evaluation (TNDE) approach based on Thermographic Signal Reconstruction (TSR) fingerprints to enable repeatable depth and area estimation of impact-induced damage. A data-driven threshold is derived from the logarithmic slope histogram sequence, allowing consistent separation of sound and damaged regions without relying on contrast extrema or operator-dependent frame selection. The method is first validated using flat-bottom holes (FBH) of known geometry and then applied to an industrial thermoplastic composite demonstrator subjected to multiple impact energies. Quantitative comparisons with ultrasonic C-scan measurements demonstrate convincing correlation and stable trends, with error magnitudes consistent with known physical limitations of flash thermography for deeper or structurally constrained defects. The results demonstrate that the proposed methodology offers a resilient, contactless alternative for swift BVID screening and comparative damage quantification in aerospace composite inspection.
[1] M.O.W. Richardson, M.J. Wisheart, Review of low-velocity impact properties of composite materials, Compos. Part A 27 (1996) 1123–1131.
[2] L. Yuan, X. Zhu, Q. Sun, H. Liu, P. Yuen, Y. Liu, Automatic extraction of material defect size by infrared image sequence, Appl. Sci. 10 (2020) 8248.
DOI: 10.3390/app10228248
[3] A. Ardebili, M. Farahani, Delamination defect evaluation in CFRP composite patches by active thermography, J. Nondestruct. Eval. 41 (2022) 61.
[4] L. Sripragash, M. Sundaresan, Non-uniformity correction and sound zone detection in pulse thermographic NDE, NDT E Int. 87 (2017) 60–67.
[5] L. Sripragash, A quantitative thermographic nondestructive technique for damage assessment, PhD Thesis, North Carolina A&T State University, 2015.
[6] G. Ólafsson, R.C. Tighe, J.M. Dulieu-Barton, Improving probing depth of thermographic inspection of polymer composites, Meas. Sci. Technol. 30 (2019) 025601.
[7] A. Wronkowicz, A. Katunin, D. Wachla, Enhancement of damage identification in composite structures using thermography, Optik 181 (2019) 545–554.
[8] R. Marani, D. Palumbo, U. Galietti, E. Stella, T. D'Orazio, Noise reduction for defect characterization in pulsed thermography, NDT E Int. 102 (2019) 226–233.
[9] S. Farmaki, D.A. Exarchos, I.K. Tragazikis, T.E. Matikas, K.G. Dassios, Infrared thermography for rapid damage assessment in aircraft composites, Sensors 20 (2020) 4113.
DOI: 10.3390/s20154113
[10] H. Tuo, Z. Lu, X. Ma, J. Xing, C. Zhang, Damage mechanisms in composite laminates under low-velocity impact, Compos. Part B 163 (2019) 642–654.
[11] C. Maierhofer, R. Krankenhagen, M. Röllig, Thermographic testing of impact damage in composites, Compos. Part B 173 (2019) 106899.
[12] Z. Wang, M. Zhao, K. Liu, K. Yuan, J. He, Experimental analysis and prediction of CFRP delamination caused by ice impact, Eng. Fract. Mech. 273 (2022) 108757.
[13] Hidayat, Z.; Avdelidis, N.P.; Fernandes, H. Brief Review of Vibrothermography and Optical Thermography for Defect Quantification in CFRP Material. Sensors 2025, 25, 1847.
DOI: 10.3390/s25061847
[14] Zhang, Y., Zhang, K., Wang, W. et al. Effect of Background Subtraction on Defect Detection in Thermographic Signal Reconstruction Coefficient Images. J Nondestruct Eval 41, 44 (2022).
[15] Roberto Marani, Daniel U. Campos-Delgado, Depth classification of defects in composite materials by long-pulsed thermography and blind linear unmixing, Composites Part B: Engineering, Volume 248, 2023, 110359, ISSN 1359-8368.
[16] Queirós, J.; Lopes, H.; Mourão, L.; dos Santos, V. Inspection of Damaged Composite Structures with Active Thermography and Digital Shearography. J. Compos. Sci. 2025, 9, 398.
DOI: 10.3390/jcs9080398
[17] Lars Gerdes, Frank Walther, Impact damage detection for carbon fiber-reinforced polyurethane by means of active thermography and computed tomography, Engineering Failure Analysis, Volume 170, 2025, 109306, ISSN 1350-6307.
[18] H.S. Carslaw, J.C. Jaeger, Conduction of Heat in Solids, Oxford University Press, Oxford, 1939.
[19] S.M. Shepard, Surface-excited thermography, in: Nondestructive Evaluation of Materials, ASM International, 2018, p.129–138.
[20] S.M. Shepard, M.F. Beemer, Advances in thermographic signal reconstruction, Proc. SPIE 9485 (2015) 204–210.
[21] J. Gruber, K. Gresslehner, J. Sekelja, G. Mayr, G. Hendorfer, Signal-to-noise ratio threshold in active thermography, in: Proc. NDT Aerospace, 2014.
[22] S.M. Shepard, J.R. Lhota, Y. Hou, T. Ahmed, D. Wang, Thermographic characterization of composite materials, SAMPE Symp. Proc. 49 (2004) 1953–1959.
[23] Dhar, P., Rijal, M., Amevorku, R. D., & Mensah, D. A. Assessing Impact Damage In Thermoplastic Composites Using Maximum Contrast Approach.
[24] Dhar, P. (2024). Assessing Barely Visible Impact Damage in Thermoplastic Composites Through Thermographic Non-Destructive Evaluation Techniques (Order No. 31485142). Available from ProQuest One Academic. (3100677587).
[25] E. D'Accardi, D. Palumbo, U. Galietti, Defect depth and size estimation using pulsed thermography, J. Nondestruct. Eval. 41 (2022) 41.
[26] P. Zhu, D. Wu, L. Yin, W. Han, Quantitative defect sizing using infrared thermography, Opt. Express 30 (2022) 9119–9136.
DOI: 10.1364/oe.454360