湿热环境下复合材料薄壁梁振动特性研究

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (15) : 154-160.

论文

湿热环境下复合材料薄壁梁振动特性研究

马艳龙，李映辉

作者信息 +

Free vibration characteristics of a composite thin-walled beam under hygrothermal environment

MA Yan-long, LI Ying-hui

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文章历史 +

摘要

研究湿热环境变化对复合材料薄壁梁自由振动特性的影响。给出了复合材料薄壁梁的位移场和应变场，将湿热应变引入单层材料的本构关系，基于Hamilton原理得到湿热环境下复合材料薄壁梁的多向耦合振动方程。用Galerkin法和假设模态得到薄壁梁的固有频率。讨论了周向均匀刚度（CUS）构型复合材料薄壁梁的耦合振动特点。数值计算分析了湿度、温度变化及铺层角度对梁振动特性的影响。

Abstract

The free vibration characteristics of the composite thin-walled beam under hygrothermal environment are investigated in this paper. Firstly, the displacement field of the closed-section beam is given as well as the strain. The influence of hygrothermal environment on dynamic characteristics is taken into account through adding the strain of moisture and thermal expansion into the constitutive relation of single layer material .The multi-directional coupling motion equations of the composite beam are derived employing Hamilton's principle. The natural frequencies are obtained based on Galerkin method and assumed-modes method. The coupling vibrations of the typical composite beam construction, the circumferentially uniform stiffness (CUS), are discussed. The influence of temperature , moisture and ply angles on the natural frequencies is analyzed through numerical simulation.

导出引用

马艳龙，李映辉. 湿热环境下复合材料薄壁梁振动特性研究[J]. 振动与冲击, 2016, 35(15): 154-160

MA Yan-long, LI Ying-hui. Free vibration characteristics of a composite thin-walled beam under hygrothermal environment[J]. Journal of Vibration and Shock, 2016, 35(15): 154-160

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