The Correlation of Ultrasonic Attenuation and Shear Strength in Graphite-Polyimide Composites

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Abstract
The buffer rod technique for measuring attenuation in thin specimens is modified here to apply to specimens having intermediate thicknesses and high attenuation. The described procedure, which requires only one access ible surface of the material, was used to determine the initial attenuation values of ultrasonic waves in short beam shear specimens of graphite- polyimide composite material. It is shown that there is good correlation between the initial attenuation values and the shear strengths of the speci mens determined by the standard short beam shear test method. The modi fied ultrasonic buffer block technique offers much potential for service as a quantitative, nondestructive, quality assurance test for composite mater ials.

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