Abstract
This paper presents an experimental work on detection of impact damage for composite structure by using electrical impedance tomography (EIT). A piece of carbon nanotube (CNT) film is attached on the surface of the composite structure as a sensing skin to detect impact damage through its conductivity change. Electrodes are equally spaced along the film’s boundary, and a constant DC current is injected into the film between the adjacent electrode pair sequentially while voltage measurements are acquired from the rest of electrode pairs. EIT is then used to reconstruct the change of internal conductivity of the CNT film caused by impact damage with these measurements. It is formulated as a linear inverse problem, and an inverse analysis with L1-norm regularization is used to perform the reconstruction. Experimental results have demonstrated that EIT can successfully reconstruct the localized areas with reduced conductivity, thus quantitatively identifying the impact damages.
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Acknowledgements
This research is supported by the National Nature Science Foundation (Grant No. 11602104), Aeronautical Science Foundation of China (2017ZA52005), and the Research Fund of State Key Laboratory of Mechanics and Control of Mechanical Structures (Grant Nos. 0216Y01 and MCMS-I-0218G01).
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Yang, Z.J., Yan, G. (2020). Detection of Impact Damage for Composite Structure by Electrical Impedance Tomography. In: Wang, C., Ho, J., Kitipornchai, S. (eds) ACMSM25. Lecture Notes in Civil Engineering, vol 37. Springer, Singapore. https://doi.org/10.1007/978-981-13-7603-0_51
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DOI: https://doi.org/10.1007/978-981-13-7603-0_51
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