Simulation of incoherent and coherent backscattered wave fields from cavities in a solid matrix
| Autor: | Richard E. Challis, Valerie J. Pinfield |
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| Rok vydání: | 2012 |
| Předmět: |
Time Factors
Materials science Acoustics and Ultrasonics Computer simulation Backscatter Acoustics Numerical Analysis Computer-Assisted Signal Processing Computer-Assisted Radius Models Theoretical Signal Computational physics Motion Sound Arts and Humanities (miscellaneous) Cavitation Volume fraction Scattering Radiation Computer Simulation Ultrasonics Ultrasonic sensor Material properties Porosity |
| Zdroj: | The Journal of the Acoustical Society of America. 132:3760-3769 |
| ISSN: | 0001-4966 |
| DOI: | 10.1121/1.4763985 |
| Popis: | This 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 (ensemble-averaged) 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. |
| Databáze: | OpenAIRE |
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