The theoretical model established by the authors in an earlier paper to analyze the ultrasonic backscatter from a porous unidirectional fiber-reinforced composite was extended in this paper to apply to multi-ply fiber-reinforced composites. The model describes the characteristically anisotropic features of polar backscatter by taking into account the directional inhomogeneity of the composite against an anisotropic but homogeneous background. If the composite contains porosity at the ply interfaces an added backscattering component is introduced. The model is tested on a composite plate submerged in water. The wavelength was assumed to be sufficiently larger than the ply thickness to eliminate scattering by individual fibers.
|Original language||English (US)|
|Title of host publication||Review of Progress in Quantitative Nondestructive Evaluation|
|Number of pages||8|
|State||Published - 1988|
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