期刊
SMART MATERIALS AND STRUCTURES
卷 21, 期 12, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0964-1726/21/12/125001
关键词
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资金
- DFG [ZH 15/16-1]
- DAAD projects
- Ministry of Education and Science of Russian Federation (Federal Targeted Program 'Scientific and Scientific-Pedagogical Personnel of Innovative Russia') [14.740.11.0578]
- Russian Foundation for Basic Research [12-01-00320]
The research aims at an experimental approval of the trapping mode effect theoretically predicted for an elastic plate-like structure with a horizontal crack. The effect is featured by a sharp capture of incident wave energy at certain resonance frequencies with its localization between the crack and plate surfaces in the form of energy vortices yielding long-enduring standing waves. The trapping modes are eigensolutions of the related diffraction problem associated with nearly real complex points of its discrete frequency spectrum. To detect such resonance motion, a laser vibrometer based system has been employed for the acquisition and appropriate visualization of piezoelectrically actuated out-of-plane surface motion of a two-layer aluminum plate with an artificial strip-like delamination. The measurements at resonance and off-resonance frequencies have revealed a time-harmonic oscillation of good quality above the delamination in the resonance case. It lasts for a long time after the scattered waves have left that area. The measured frequency of the trapped standing-wave oscillation is in a good agreement with that predicted using the integral equation based mathematical model.
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