Ultrasonic NDE of Laser-Damaged Organo-Matrix 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
The ultrasonic attenuation and velocity in graphite/epoxy (Gr/Ep) composites damaged by real and simulated laser radiation were measured. The measurements were carried out with composite ultrasonic test equipment (CUTE), a water-tank testbed constructed to study the elastic properties of samples subjected to CO2 laser radiation at several different scan rates. Parallel simulation studies were carried out on samples subjected to temperatures high enough to cause pyrolysis. The ultrasonic measurements were made in the 1 to 5 MHz frequency range for varying angles of incidence. The damage manifests itself in differing degrees of porosity depending on the intensity of irradiation. Both attenuation and velocity were found to be sensitive to this damage.