Vibration of bi-dimensional functionally graded Timoshenko beams excited by a moving load

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• 作者：Dinh Kien Nguyen ; Quang Huan Nguyen ; Thi Thom Tran ; Van Tuyen Bui
• 刊名：Acta Mechanica
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：228
• 期：1
• 页码：141-155
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Theoretical and Applied Mechanics; Classical and Continuum Physics; Continuum Mechanics and Mechanics of Materials; Structural Mechanics; Vibration, Dynamical Systems, Control; Engineering Thermodynam
• 出版者：Springer Vienna
• ISSN：1619-6937
• 卷排序：228

文摘

This paper studies the vibration of bi-dimensional functionally graded Timoshenko beams excited by a moving concentrated load. The volume fraction of constituent materials is assumed to vary in both the thickness and longitudinal directions by power-law functions. The governing equations of motion based on Timoshenko beam theory are constructed from Hamilton’s principle. A finite element formulation is derived and used in combination with the Newmark method in computing the vibration response. A parametric study is carried out to highlight the effect of the material distribution and moving load speed on the vibration characteristics of the beams. The numerical results show that the two grading indexes which govern the variation of the effective material properties have opposite effect on the natural frequencies, dynamic magnification factor and mid-span axial stress. The influence of the aspect ratio on the dynamic behavior of the beams is also examined and discussed.