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High frequency ultrasonic wave propagation in an immersed porous aluminium sheet is modelled and the results verified by experiment using focused broadband 50, 100 and 175 MHz waves. For colinear (pores extending from face to face of the sheet) samples the microstructure facilitates transmission at angles beyond 35deg, which is far greater than the critical angles for a homogeneous solid, and at a...
In this work high frequency ultrasonic wave propagation in an immersed porous aluminium sheet is modelled and the results verified by experiment using focused broadband 50 MHz waves. The sample microstructure has a profound influence on the propagation which occurs as a single wavefront and facilitates transmission at angles far greater than the critical angles for a homogeneous solid. We also found...
Advances in computing power and modeling have enabled the interaction of ultrasound and material microstructure to be more readily revealed. We find that in the case of a commonly occurring microstructure ultrasonic wave propagation is changed in a profound way which may have beneficial outcomes
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