Deep postbuckling and nonlinear bending behaviors of nanobeams with nonlocal and strain gradient effects

doi:10.1007/s10483-019-2482-9

Applied Mathematics and Mechanics (English Edition) ›› 2019, Vol. 40 ›› Issue (4): 515-548.doi: https://doi.org/10.1007/s10483-019-2482-9

Deep postbuckling and nonlinear bending behaviors of nanobeams with nonlocal and strain gradient effects

Bo ZHANG^1,2, Huoming SHEN^1,2, Juan LIU^1,2, Yuxing WANG^1,2, Yingrong ZHANG^1,2

1. School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 611756, China;
2. Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, Chengdu 611756, China

收稿日期:2018-05-02 修回日期:2018-08-12 出版日期:2019-04-01 发布日期:2019-04-01
通讯作者: Bo ZHANG E-mail:zhbxnjt@163.com
基金资助:
Project supported by the National Natural Science Foundation of China (Nos. 11672252 and 11602204) and the Fundamental Research Funds for the Central Universities, Southwest Jiaotong University (No. 2682016CX096)

Deep postbuckling and nonlinear bending behaviors of nanobeams with nonlocal and strain gradient effects

Bo ZHANG^1,2, Huoming SHEN^1,2, Juan LIU^1,2, Yuxing WANG^1,2, Yingrong ZHANG^1,2

1. School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 611756, China;
2. Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, Chengdu 611756, China

Received:2018-05-02 Revised:2018-08-12 Online:2019-04-01 Published:2019-04-01
Contact: Bo ZHANG E-mail:zhbxnjt@163.com
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 11672252 and 11602204) and the Fundamental Research Funds for the Central Universities, Southwest Jiaotong University (No. 2682016CX096)

摘要/Abstract

摘要：

In this paper, multi-scale modeling for nanobeams with large deflection is conducted in the framework of the nonlocal strain gradient theory and the Euler-Bernoulli beam theory with exact bending curvature. The proposed size-dependent nonlinear beam model incorporates structure-foundation interaction along with two small scale parameters which describe the stiffness-softening and stiffness-hardening size effects of nanomaterials, respectively. By applying Hamilton's principle, the motion equation and the associated boundary condition are derived. A two-step perturbation method is introduced to handle the deep postbuckling and nonlinear bending problems of nanobeams analytically. Afterwards, the influence of geometrical, material, and elastic foundation parameters on the nonlinear mechanical behaviors of nanobeams is discussed. Numerical results show that the stability and precision of the perturbation solutions can be guaranteed, and the two types of size effects become increasingly important as the slenderness ratio increases. Moreover, the in-plane conditions and the high-order nonlinear terms appearing in the bending curvature expression play an important role in the nonlinear behaviors of nanobeams as the maximum deflection increases.

关键词: conical shell, displacement function, generalized hypergeometric function, elastic foundation, two-step perturbation method, deep postbuckling, nonlocal strain gradient theory, nanobeam

Abstract:

Key words: conical shell, displacement function, generalized hypergeometric function, elastic foundation, nonlocal strain gradient theory, two-step perturbation method, nanobeam, deep postbuckling

中图分类号:

74H55

Bo ZHANG, Huoming SHEN, Juan LIU, Yuxing WANG, Yingrong ZHANG. Deep postbuckling and nonlinear bending behaviors of nanobeams with nonlocal and strain gradient effects[J]. Applied Mathematics and Mechanics (English Edition), 2019, 40(4): 515-548.

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Deep postbuckling and nonlinear bending behaviors of nanobeams with nonlocal and strain gradient effects

Deep postbuckling and nonlinear bending behaviors of nanobeams with nonlocal and strain gradient effects

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