A Simulation Study to Explain the Variability of Ultrasonic Attenuation Measurement in RTM Composites

Lonne, Sébastien; Thévenot, Françoise

doi:10.1063/1.1711714

Cited by 1 publication

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“…One of our aims in deriving the present model was to describe a two-phase unidirectional fiber-reinforced layer as an anisotropic and attenuating material homogeneous at the wavelength scale for further simulations [6]. Considering the typical diameter of fibers (7 µm), the typical fiber volume fraction (65%) and the typical frequency range of ultrasonic testing of one composite of interest [6], the wavelength scale is such that viscosity, multiple-scattering and their possible coupling appear as a (homogeneous) global phenomenon. Under such an assumption, the effect on wave amplitude of the overall attenuation phenomena maybe written as a simple frequency-dependent filter as…”

Section: Theorymentioning

confidence: 99%

Modeling of Ultrasonic Attenuation in Uni-Directional Fiber Reinforced Composites Combining Multiple-Scattering and Viscoelastic Losses

Lonne¹,

Calmon²,

Biwa³

et al. 2004

AIP Conference Proceedings

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A model coupling viscoelastic and multiple-scattering losses is developed to predict ultrasonic attenuation in unidirectional fiber reinforced composite of high fiber volume fraction. Complex-valued stiffness constants accounting for viscoelasticity are inserted in classical multiplescattering theory. Waves of various polarities (SH, SV, L) relatively to the fiber direction are considered. SH waves only require a scalar treatment, whereas the others require a vector treatment accounting for mode-conversions. Comparisons of predicted attenuation coefficients with experimentally measured ones validate the model.

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Section: Theorymentioning

confidence: 99%