Experimental observation validates wave mixing behavior in isotropic plates, suggesting new insights for wave interactions.
Key Points
This research aims to experimentally investigate the non-collinear mixing of Lamb waves in a nonlinear isotropic plate and validate theoretical predictions.
Measured sum-frequency components of mixed A0 Lamb waves in a 2-mm aluminum alloy plate.
Utilized two primary frequency pairs: 0.6/0.6 MHz and 0.55/0.65 MHz.
Performed wavenumber-frequency spectrum analysis based on temporal waveforms at various distances.
Conducted non-collinear measurements at different intersection angles of A0 modes.
Identified sum-frequency components at 1.2 MHz as fundamental S0 Lamb waves, aligning with theoretical predictions.
Determined that the amplitude of the sum-frequency S0 mode increases near the angle for internal resonance.
Noted a slight shift in maximum amplitude location from the theoretical resonant angle, consistent with numerical simulations.