Abstract
In this paper, the effect of vibration resonance on nonlinear ultrasonic response of defects is studied. Unlike the resonance of the whole specimen, the Local Defect Resonance (LDR) naturally provides an efficient energy pumping from the wave directly to the defect. The LDR-“amplifier”, therefore, exhibits transition to nonlinear regime at moderately low driving amplitude. In addition, the concept of the defect as a nonlinear oscillator brings about different dynamic and frequency scenarios in its nonlinear behaviour characteristic of the parametric oscillations. The experiments confirm unconventional nonlinear dynamics of simulated and realistic defects subject to LDR. The resonant nonlinear defects demonstrate threshold dynamics of instable vibrations, hysteresis, superand subharmonic resonances with anomalously efficient generation of the higher harmonics and subharmonics.
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