PinfieldChallis2012 JASA.pdf (1.08 MB)
Download fileSimulation of incoherent and coherent backscattered wave fields from cavities in a solid matrix
journal contribution
posted on 2013-01-08, 12:23 authored by Valerie PinfieldValerie Pinfield, Richard E. ChallisThis paper reports a study of the backscattered ultrasonic signal from a solid layer containing spherical
cavities, to determine the conditions in which an effective medium model is a valid description
of the response. The work is motivated by the need to model the response of porous composite
materials for ultrasonic non-destructive evaluation (NDE) techniques. The numerical simulation
predicts the response of a layer containing cavities at a single set of random locations, and compares
it to the predicted response from a homogeneous layer with ensemble-averaged material properties
(effective medium model). The study investigates the conditions in which the coherent (ensembleaveraged)
response is obtained even from a single configuration of scatterers. Simulations are carried
out for a range of cavity sizes and volume fractions. The deviation of the response from effective
medium behavior is modeled, along with the trends as a function of cavity radius, volume
fraction, and frequency, in order to establish an acceptability criterion for application of an effective
medium model.
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School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Chemical Engineering