The threshold of subharmonic is discussed and the influence of model parameters on the subharmonic resonance parameter condition is investigated. An aluminum beam with a fatigue crack is used to …

Conclusion We introduced our works on a nonlinear imaging method, subharmonic phased array for crack evaluation (SPACE) to significantly improve the depth measurement accuracy of closed …

For the homogeneous plate the mismatch w n - w /2 is due to the symmetry of fundamental modes with respect to x. Only symmetric odd n can induce a subharmonic, but never w /2 coincides with a plate …

A new method for detection and sizing of closed crack is described which uses transient waveform of subharmonics with half input frequency in ultrasonic nondest....

EVALUATION OF CLOSED CRACKS BY ANALYSIS OF SUBHARMONIC ULTRASOUND WITH CLOSURE STRESS K. Yamanaka 1, T. Mihara 1 and T. Tsuji 1,2 1 Department of Materials …

Therefore, for an intense acoustic excitation it can manifest such effects as subharmonic generation, instability and transition to chaotic dynamics. As a result, the spectrum of local oscillations acquires a …

The threshold value of the drive amplitude necessary to initiate subharmonic generation depends on the cantilever drive frequency, the effective damping coefficient, and the nonlinearity of the cantilever …

To overcome the problem, subharmonics in nonlinear ultrasound is particularly useful because of the excellent selectivity for closed cracks and high temporal resolution, which has been verified by the …

To overcome the problem, subharmonics in nonlinear ultrasound is particularly useful because of the excellent selectivity for closed cracks and high temporal resolution, which has been verified by the …

The purpose of this paper is to explain, by the soliton theory, the subharmonic generation in piezoelectric plates with Cantor-like structure (PCS).