摘要
应用非局部黏弹性夹层梁模型分析双参数弹性介质中输送脉动流碳纳米管的稳定性.新模型中同时考虑了由管道内、外壁上的薄表面层引起的表面弹性效应和表面残余应力,经典的欧拉梁模型因此通过引入非局部参数和表面参数得到了改进.用平均法对其控制方程进行求解,得到了管道稳定性区域.数值算例揭示了纳米材料的非局部效应、表面效应及两个弹性介质参数对管道固有频率、临界流速和动态稳定性的复杂影响,结论可为纳米流体机械的结构设计和振动分析提供理论基础.
In this paper, a nonlocal viscoelastic sandwich-beam model is developed to investigate the stability of a pulsating-fluid-conveying carbon nanotube （CNT） embedded in two-parameter elastic mediums. In the new model, thin surface layers are on the inner and outer tube surfaces and both the resulting effects of the surface elasticity and the surface residual stress are taken into account. The classical Euler-Bernoulli beam model is modified by introducing nonlocal and surface parameters. The governing equation is solved via the averaging method and the stability regions are obtained. Numerical examples show the complicated influences of the nonlocal, surface effects and the two medium parameters on the natural frequency, the critical flow velocity and the dynamic stability of the CNT. The conclusions of the present paper may be used in the structural design and vibration analysis of nanofluidic devices.
出处
《力学与实践》
北大核心
2014年第1期48-53,共6页
Mechanics in Engineering
基金
国家自然科学基金(51275315)
辽宁省教育厅科研基金(L2013160)资助项目
关键词
输流碳纳米管
稳定性
非局部效应
表面效应
双参数弹性介质
fluid-conveying carbon nanotube, stability, nonlocal effect, surface effect, two-parameter elastic medium
