Higher-order finite strip method (H-FSM) with nonlocal strain gradient theory for analyzing bending and free vibration of orthotropic nanoplates

IF 2.3 3区 工程技术 Q2 MECHANICS
Hojat Tanzadeh, Hossein Amoushahi
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引用次数: 0

Abstract

This paper develops a size-dependent Kirchhoff plate model for bending and free vibration analyses using a semi-analytical higher-order finite strip method (H-FSM) based on the nonlocal strain gradient theory (NSGT). To satisfy the various longitudinal boundary conditions, the continuous trigonometric function series and the interpolation polynomial functions are employed in the transverse direction. In solving nanoplate problems using the H-FSM, the higher-order polynomial shape functions (higher-order Hermitian shape functions) are utilized to evaluate the second derivatives, in addition to the displacement and first derivative. The stiffness and mass matrices, and force vector of the nanoplates are derived using the weighted residual method. A numerical study is conducted to investigate the impact of different factors, such as boundary conditions, nonlocal and strain gradient parameters, aspect ratio, and types of transverse loading. The Navier solution is utilized to analyze the effects of material length scale parameters on bending and free vibration responses of nanoplates for preliminary comparisons. The numerical results show that, when the transverse load on the nanoplate is uniform or hydrostatic and the plate has a CCCC boundary condition, the nonlocal effect does not affect the deflection results and is the same as the obtained results in the local mode.

Abstract Image

利用非局部应变梯度理论的高阶有限条带法 (H-FSM) 分析各向同性纳米板的弯曲和自由振动
本文采用基于非局部应变梯度理论(NSGT)的半解析高阶有限条带法(H-FSM),建立了一个尺寸相关的基尔霍夫板模型,用于弯曲和自由振动分析。为了满足各种纵向边界条件,在横向采用了连续三角函数序列和插值多项式函数。在使用 H-FSM 解决纳米板问题时,除了位移和一阶导数外,还利用高阶多项式形状函数(高阶赫米特形状函数)来评估二阶导数。纳米板的刚度和质量矩阵以及力矢量是通过加权残差法得出的。通过数值研究,探讨了不同因素的影响,如边界条件、非局部和应变梯度参数、长宽比和横向加载类型。利用 Navier 解决方案分析了材料长度尺度参数对纳米板弯曲和自由振动响应的影响,并进行了初步比较。数值结果表明,当纳米板上的横向载荷为均匀载荷或静水载荷,且板具有 CCCC 边界条件时,非局部效应不会影响挠度结果,且与局部模式下的结果相同。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Acta Mechanica
Acta Mechanica 物理-力学
CiteScore
4.30
自引率
14.80%
发文量
292
审稿时长
6.9 months
期刊介绍: Since 1965, the international journal Acta Mechanica has been among the leading journals in the field of theoretical and applied mechanics. In addition to the classical fields such as elasticity, plasticity, vibrations, rigid body dynamics, hydrodynamics, and gasdynamics, it also gives special attention to recently developed areas such as non-Newtonian fluid dynamics, micro/nano mechanics, smart materials and structures, and issues at the interface of mechanics and materials. The journal further publishes papers in such related fields as rheology, thermodynamics, and electromagnetic interactions with fluids and solids. In addition, articles in applied mathematics dealing with significant mechanics problems are also welcome.
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