Guided Lamb waves in reconfigurable phononic crystal waveguides

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 complete bandgap extending from 50 to 70 kHz. Guidance is clearly observed Doppler vibrometer, even after 90° bends. The eigenmodes obtained using finite element analysis explain tuning resonances through bending cantilever model. Numerical experimental results generally found fair agreement. They also suggest that guiding rather independent details waveguides. significance for design devices.