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

Abstract

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.

Simulation of ultrasonic TFM/FMC imaging for porosity clusters using multiple scattering modelling: Quantitative analyses and experimental comparisons

“…The case of several parallel cylinders is particularly studied, for example in [8][9][10]. This represents indeed important developments which were abundantly used for the study of composites [11,12]. Thus, when the spatial configuration of scatterers show a periodicity, some authors propose for example to calculate a modified Green function [13] to compute the transmission and reflection coefficients of an infinite array of cylinders with any cross section.…”

Simulation of ultrasonic inspection of composite using bulk waves: Application to curved components

“…These structures exhibit a strong anisotropy between the axis and the plane of the stack. Previous works concerning beam calculation in CFRP were already implemented in CIVA [1], [2], [3]. The approach is based on the search of equivalent energy direction through the stacking sequence of the layered structure.…”