Eddy Current Inspection of Thick Carbon Fiber Reinforced Composites
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
Eddy current nondestructive evaluation (NDE) is usually associated with the detection and measurement of surface defects in metal and with the through-thickness inspection of thin-wall metal tubing. The greater electrical resistivity of carbon fiber reinforced composites (CFRCs), excluding metal matrix composites, results in much greater skin depths or standard depths of penetration, thereby providing for the through-thickness inspection of much thicker components than are usually associated with eddy current NDE. For example, skin depths in copper and 304 stainless steel at 10 kHz are 0.026 inch** and 0.168 inch, respectively. Assuming typical resistivity values for carbon/carbon and graphite epoxy, skin depths in these materials at 10 kHz are 0.56 and 1.98 inch, respectively.