title: Orbital-type trapping of elastic Lamb waves.
abstract: The interaction of laser-generated Lamb waves propagating in a plate with a sharp-angle conical hole was studied experimentally and numerically. Part of the energy of the incident wave is trapped within the conic area in two ways: the antisymmetric Lamb wave orbiting the center of the hole and the wave localized at the acute edge. Parameters and conditions for optimal conversion of the incident wave into the trapped modes were studied in this work. Experiments were performed using the laser stroboscopic shearography technique, which delivers the time evolution of the acoustic field in the whole area of interest. The effect of trapping can be used for efficient damping, similar to the one-dimensional acoustical black hole effect.
authors: Faculty of Science, Nanjing University of Science and Technology, Nanjing 210094, China; General Physics Institute, Russian Academy of Sciences, 119991 Moscow, Russia.
authors: Alexey M
authors: AM
authors: Lomonosov
authors: Faculty of Science, Nanjing University of Science and Technology, Nanjing 210094, China.
authors: Shi-Ling
authors: SL
authors: Yan
authors: Faculty of Science, Nanjing University of Science and Technology, Nanjing 210094, China.
authors: Bing
authors: B
authors: Han
authors: Faculty of Science, Nanjing University of Science and Technology, Nanjing 210094, China.
authors: Hong-Chao
authors: HC
authors: Zhang
authors: Faculty of Science, Nanjing University of Science and Technology, Nanjing 210094, China. Electronic address: shenzh@njust.edu.cn.
authors: Zhong-Hua
authors: ZH
authors: Shen
keywords: Acoustic black hole; Lamb wave; Wave trapping