The Mode Conversion of Guided Waves from the Asymmetry of Material
A new mode conversion of guided waves in a discretely layered functionally graded plate is studied by finite element method. Finite element model of the graded plate is constructed using MSC. Patran. Legrend orthogonal polynomial series expansions approach is used for determining the guided waves displacements distributions and group velocities dispersion curves of the graded plate. According to the dispersion curves, the two modes beyond the first cutoff frequency are incident at one end face of the plate, but there are three wave packages in the first end-reflected waveform. Through analyzing the waveforms of different receiving points, a conclusion can be drawn that the mode conversion occurs on both modes when they reflect on one plate end. Next, analysis of symmetric layered graded plate is used to compare with the asymmetric model to verify that the mode conversion is caused by the asymmetry of material. Finally, through analyzing the displacements distributions of the two structures, the cause of the mode conversion is discovered. The converted modes are caused by the asymmetry of the displacements distributions that are resulted from the asymmetry of material.
mode conversion guided waves displacements distributions finite element method
Yu Jiangong Wu Bin He Cunfu
College of Mechanical Engineering and Applied Electronic Technology, Beijing University of Technology, Ping Le Yuan 100＃, Chaoyang District Beijing 100022 P.R. China
国际会议
北京
英文
2007-08-05（万方平台首次上网日期，不代表论文的发表时间）