Conference: Publication Date: 23 August 2022Testing Method:
In this paper, a fundamental study was conducted to clarify the principle of crack detection in dielectrics by electromagnetic induction testing (EIT). Simulations and experiments showed that the crack detection principle was different between EIT for conductors (= eddy current testing) and EIT for dielectrics. First, the numerical simulations of cracks in conductors and dielectrics showed that eddy currents and displacement currents formed different current paths around cracks. Next, cracks in conductors and dielectrics were detected using EIT, and it was shown that the locations on the specimen where the EIT output changed were significantly different for conductors and dielectrics. The results showed that the principle of crack detection by EIT for dielectrics was different from that for conductors.
[1] Schmidt, C., Schultz, C., Weber, P., and Denkena, B., 2014, “Evaluation of Eddy Current Testing for Quality Assurance and Process Monitoring of Automated Fiber Placement,” Compos. Part B Eng., 56, pp. 109–116.
[2] Mizukami, K., Ibrahim, A. S. bin, Ogi, K., Matvieieva, N., Kharabet, I., Schulze, M., and Heuer, H., 2019, “Enhancement of Sensitivity to Delamination in Eddy Current Testing of Carbon Fiber Composites by Varying Probe Geometry,” Compos. Struct., 226(July).
[3] Heuer, H., Schulze, M. H., and Meyendorf, N., 2013, “3 - Non-Destructive Evaluation (NDE) of Composites: Eddy Current Techniques,” Non-Destructive Evaluation (NDE) of Polymer Matrix Composites, pp. 33–55.
[4] Mizukami, K., Mizutani, Y., Todoroki, A., and Suzuki, Y., 2015, “Design of Eddy Current-Based Dielectric Constant Meter for Defect Detection in Glass Fiber Reinforced Plastics,” NDT E Int., 74, pp. 24–32.
[5] Gäbler, S., Heuer, H., and Heinrich, G., 2015, “Measuring and Imaging Permittivity of Insulators Using High-Frequency Eddy-Current Devices,” IEEE Trans. Instrum. Meas., 64(8), pp. 2227–2238.
[6] Matsunaga, W., Mizukami, K., Mizutani, Y., and Todoroki, A., 2022, “Estimation of the Moisture Absorption Rate of Glass Fiber Reinforced Plastic Using Electromagnetic Induction Testing,” Compos. Part C Open Access, 8(March), p. 100260.
[7] Kim, Y. J., Shin, T. S., Choi, H. Do, Kwon, J. H., Chung, Y. C., and Yoon, H. G., 2005, “Electrical Conductivity of Chemically Modified Multiwalled Carbon Nanotube/Epoxy Composites,” Carbon N. Y., 43(1), pp. 23–30.
[8] Gardea, F., and Lagoudas, D. C., 2014, “Characterization of Electrical and Thermal Properties of Carbon Nanotube/Epoxy Composites,” Compos. Part B Eng., 56, pp. 611–620.
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