Guided elastic waves in infinite free-clamped hollow cylinders  

Guided elastic waves in infinite flee-clamped hollow cylinders

作　　者：Liguo Tang Shengxing Liu 

机构地区：[1]Department of Oceanography, Xiamen University, Xiamen 361005, China [2]Key Laboratory of Underwater Acoustic Communication and Marine Information Technology of the Ministry of Education, Xiamen University, Xiamen 361005, China

出　　处：《Progress in Natural Science:Materials International》2009年第3期313-320,共8页自然科学进展·国际材料（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant No.10704064).

摘　　要：Guided elastic-wave-inspection technique for hollow cylinders has received plenty of attention in recent years because of its high efficiency and low cost. To apply guided elastic waves to defects detection, it is necessary to investigate the propagation of guided waves in the hollow cylinders under all kinds of boundary conditions. In this paper, the dispersion equations of torsional, longitudinal and flexural guided waves in the hollow cylinders with traction-free and clamped lateral boundaries are derived by elastodynamic theory, based on which the phase and group velocity dispersion curves of the guided waves mentioned above are obtained. And the dispersion properties of these waves are discussed in detail. The transient wave in a free-clamped hollow cylinder is simulated by the finite element method （FEM）. The time-frequency distribution of the transient wave agrees well with the theoretical group velocity dispersion curves.Guided elastic-wave-inspection technique for hollow cylinders has received plenty of attention in recent years because of its high effciency and low cost. To apply guided elastic waves to defects detection, it is necessary to investigate the propagation of guided waves in the hollow cylinders under all kinds of boundary conditions. In this paper, the dispersion equations of torsional, longitudinal and flexural guided waves in the hollow cylinders with traction-free and clamped lateral boundaries are derived by elastodynamic theory, based on which the phase and group velocity dispersion curves of the guided waves mentioned above are obtained. And the dispersion properties of these waves are discussed in detail. The transient wave in a free-clamped hollow cylinder is simulated by the finite element method (FEM). The time-frequency distribution of the transient wave agrees well with the theoretical group velocity dispersion curves.

关 键 词：Guided elastic waves Free-clamped hollow cylinders DISPERSION 

分 类 号：O347.41[理学—固体力学] TU41[理学—力学]