Ultrasonic testing (UT) has been used for nondestructive evaluation (NDE) of materials for more than half a century. A number of NDE techniques have been developed and specifi standards have been created for the UT applications in different areas of engineering. UT has two main goals related to inspection of solid objects, firstl , detection and characterization of material discontinuities (fl ...

We demonstrate experimentally the manipulation of Lamb waves guided along reconfigurable phononic circuits created by defects composed threaded rods held with nuts in a perforated solid crystal slab. Adjusting free length rod, resonant frequency defect can be tuned, without any change supporting Both straight and bent waveguides are fabricated measured an aluminum sample lattice constant 20 mm ...

Spatially distributed arrays of piezoelectric disks are being applied to monitor structural integrity using Lamb waves. Applied loads directly affect waves propagating between array elements because of dimensional changes and the acoustoelastic effect. Resulting changes in phase velocity depend upon the propagation direction as well as the Lamb wave mode and frequency. This paper shows from num...