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Non-destructive evaluation (NDE) of composites: Eddy current techniques

: Heuer, H.; Schulze, M.H.; Meyendorf, N.


Karbhari, V.M.:
Non-destructive evaluation (NDE) of polymer matrix composites : Techniques and applications
Cambridge: Woodhead Publishing, 2013 (Woodhead publishing series in composites science and engineering 43)
ISBN: 978-0-85709-344-8
ISBN: 0-85709-344-4
ISBN: 978-0-85709-355-4 (Online)
Book Article
Fraunhofer IZFP ()

Industrial mass-producing carbon fiber reinforced polymer (CFRP) processes (e.g. resin transfer molding) require non-destructive testing (NDT) methods that can be applied to dry textile multilayer materials and to final components as well. Questions to be solved are fiber orientations, gaps, local defects, etc. By analyzing the electrical properties of carbon fiber materials - the fiber distribution and the dielectric properties can be inspected non-destructively. Based on high-frequency eddy current techniques, structural and hidden defects such as missing carbon fiber bundles, lanes, fringes and angle deviations for hidden layers can also be detected. Carbon fiber based materials show a low electrical conductivity, which is sufficient to measure deviations in the material by using eddy current techniques. Eddy current methods show a high potential for inline integration due to the absence of couplings, e.g., compared to ultrasonic.