Multiparameter Ultrasonic Evaluation of Thick Composite Materials

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1990
Authors
Murphy, Robert
Reed, Robert
Batzinger, Thomas
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Review of Progress in Quantitative Nondestructive Evaluation
Center for Nondestructive Evaluation

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

Traditional pulse-echo ultrasonic NDE techniques are useful in the evaluation for structural flaws in components manufactured from homogeneous materials (i.e. most metals). However, composite materials are often neither homogeneous nor isotropic which decreases the sensitivity of traditional techniques by making the resultant data difficult to interpret. Composite materials also tend to attenuate the ultrasonic energy to a greater degree than metals decreasing the signal-to-noise ratio needed for confident flaw detection. The attenuation is attributed to the absorption of energy by the matrix and the scattering of energy due to the inherent scatterers in the system such as fibers and small voids or porosity. For very thick composites these difficulties are amplified. In addition, a component of the attenuation due to ultrasonic beam spreading increases with thickness. As the beam spreads, spatial resolution is lost as well.

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Mon Jan 01 00:00:00 UTC 1990