Postbuckling and nonlinear free vibration of postbuckled porous functionally graded micro/nanotubes via nonlocal strain and velocity gradient theory

IF 2.8 3区 工程技术 Q2 MECHANICS International Journal of Non-Linear Mechanics Pub Date : 2024-07-31 DOI:10.1016/j.ijnonlinmec.2024.104862
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Abstract

Background

Vibration response analysis serves as a critical tool in investigating the behavior of micro/nanoscale structures operating in dynamic environments, offering valuable insights into their performance and ultimately refining the design of devices. Particularly, when these structures are deliberately engineered to function near or within the postbuckling regime, understanding their vibratory behavior in this state becomes essential. This study focuses on exploring the postbuckling behavior and nonlinear frequencies of simply supported buckled porous functionally graded (PFG) size-dependent tubes. Internal resonances are not considered in this analysis.

Method

The nonlocal strain and velocity gradient theory, within the framework of the Euler-Bernoulli beam hypothesis, is employed to derive the nonlinear partial differential equations of motion. It is assumed that the material properties are gradually graded in the radial direction. Additionally, two different porosity distribution patterns are used in the radial direction. The method of multiple scales is used to solve the system of nonlinear ordinary differential equations obtained by applying the Galerkin method.

Results

The closed expression for the i-th nonlinear frequency of buckled porous functionally graded size-dependent tubes is determined based on the amplitude of the vibration modes involved. The findings indicate that porous M/NTs exhibit a loss of static stability at lower compressive axial loads compared to their nonporous counterparts. Furthermore, the softening effects resulting from a uniform porosity distribution are more pronounced than those from an uneven porosity distribution. Interestingly, nonporous M/NTs display the lowest nonlinear postbuckling frequency among the studied configurations. Moreover, it is observed that the nonlinear frequency tends to increase with a rise in the compressive axial load, while it decreases with an increase in the excitation amplitude.

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通过非局部应变和速度梯度理论研究后屈曲多孔功能分级微/纳米管的后屈曲和非线性自由振动
振动响应分析是研究微米/纳米级结构在动态环境中运行行为的重要工具,可为了解其性能提供宝贵的见解,并最终完善设备的设计。特别是当这些结构被刻意设计为在接近或在后屈曲状态下运行时,了解它们在这种状态下的振动行为就变得至关重要。本研究的重点是探索简单支撑的屈曲多孔功能分级管(PFG)的后屈曲行为和非线性频率。本分析未考虑内部共振。在欧拉-伯努利梁假设的框架内,采用非局部应变和速度梯度理论推导非线性偏微分运动方程。假设材料特性在径向逐渐分级。此外,在径向还采用了两种不同的孔隙率分布模式。多尺度法用于求解通过伽勒金法得到的非线性常微分方程系。根据相关振动模式的振幅,确定了多孔功能分级屈曲管的第 i 个非线性频率的封闭表达式。研究结果表明,与无孔材料相比,多孔 M/NT 在较低的压缩轴向载荷下会失去静态稳定性。此外,均匀孔隙率分布产生的软化效应比不均匀孔隙率分布产生的软化效应更为明显。有趣的是,在所研究的结构中,无孔 M/NT 的非线性后屈曲频率最低。此外,还观察到非线性频率随着压缩轴向载荷的增加而增加,而随着激励振幅的增加而降低。
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来源期刊
CiteScore
5.50
自引率
9.40%
发文量
192
审稿时长
67 days
期刊介绍: The International Journal of Non-Linear Mechanics provides a specific medium for dissemination of high-quality research results in the various areas of theoretical, applied, and experimental mechanics of solids, fluids, structures, and systems where the phenomena are inherently non-linear. The journal brings together original results in non-linear problems in elasticity, plasticity, dynamics, vibrations, wave-propagation, rheology, fluid-structure interaction systems, stability, biomechanics, micro- and nano-structures, materials, metamaterials, and in other diverse areas. Papers may be analytical, computational or experimental in nature. Treatments of non-linear differential equations wherein solutions and properties of solutions are emphasized but physical aspects are not adequately relevant, will not be considered for possible publication. Both deterministic and stochastic approaches are fostered. Contributions pertaining to both established and emerging fields are encouraged.
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