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A general bi-Helmholtz nonlocal strain-gradient elasticity for wave propagation in nanoporous graded double-nanobeam systems on elastic substrate

机译:在弹性基底上的纳米多孔梯度双纳米膜系统中波传播的一般双亥姆霍兹非局部应变梯度弹性

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摘要

In this paper, a general bi-Helmholtz nonlocal strain-gradient elasticity model is developed for wave dispersion analysis of porous double-nanobeam systems on elastic substrate. The present model incorporates three scale coefficients to examine wave dispersion relations much accurately. Porosity-dependent material properties of inhomogeneous nanobeams are defined via a modified power-law function. Based on Hamilton's principle, the governing equations of double-nanobeam system on elastic substrate are obtained. Solving analytically these equation gives wave frequencies and phase velocities as a function of wave number. It is demonstrated that phase velocities of a nanoporous double-nanobeam system rely on the porosities, material gradation, nonlocal parameters, strain gradient parameter, interlayer springs, elastic substrate and wave number. (C) 2017 Elsevier Ltd. All rights reserved.
机译:本文建立了一个通用的双亥姆霍兹非局部应变梯度弹性模型,用于弹性基底上多孔双纳米管系统的波色散分析。本模型结合了三个比例系数,可以更精确地检查波的色散关系。非均质纳米束的孔隙率依赖性材料特性是通过修改的幂律函数定义的。根据汉密尔顿原理,推导了弹性基底上双纳米系统的控制方程。通过解析求解这些方程,可以得出波频率和相速度与波数的关系。结果表明,纳米多孔双纳米膜系统的相速度取决于孔隙率,材料梯度,非局部参数,应变梯度参数,层间弹簧,弹性基底和波数。 (C)2017 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Composite Structures》 |2017年第5期|885-892|共8页
  • 作者单位

    Amirkabir Univ Technol, Dept Aerosp Engn, Tehran, Iran|Amirkabir Univ Technol, Ctr Excellence Computat Aerosp, Tehran, Iran;

    King Abdulaziz Univ, Dept Math, Fac Sci, POB 80203, Jeddah 21589, Saudi Arabia|Kafrelsheikh Univ, Dept Math, Fac Sci, Kafr Al Sheikh 33516, Egypt;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nanoporous nanobeam; Wave dispersion; Nonlocal strain gradient; Phase velocity;

    机译:纳米多孔纳米波;波频散;非局部应变梯度;相速度;

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