Abstract
The objective of this research was to illustrate the potential of quantitative ultrasonic imaging as an approach to materials characterization in inherently inhomogeneous media. Low velocity impact and fatigue damage were investigated alone and in combination in quasi-isotropic graphite epoxy composite laminates. Quantitative images based on the slope of the attenuation coefficient measured as a function of frequency over a broad bandwidth were obtained using a phase insensitive acoustoelectric receiving transducer. Results indicate that low velocity impact yielded increased values of slope of the attenuation. Fatigued samples which were subsequently subjected to impact suffered apparent damage over a substantially larger area than composites that had sustained an impact without prior fatigue.
Published Version
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