期刊
COMPOSITE STRUCTURES
卷 281, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2021.115101
关键词
Functionally graded; CNT-reinforced; Composite plates; Nonlinear free vibration; Natural element method (NEM); Parametric investigation
资金
- 2021 Hongik University Research Fund
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2020R1A2C1100924]
- National Research Foundation of Korea [2020R1A2C1100924] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This paper introduces a nonlinear numerical method for solving the nonlinear vibration problem and investigates the parametric nonlinear free vibration characteristics of FG-CNTRC plates. Through numerical formulation and comparison with reference methods, the method's reliability is confirmed with a maximum relative difference less than 8.0%. The study explores the effects of gradient pattern, volume fraction of CNTs, relative thickness, and aspect ratio on the nonlinear free vibration characteristics of FG-CNTRC plates.
This paper is concerned with the development of a nonlinear numerical method for solving the nonlinear vibration problem and the parametric investigation of nonlinear free vibration characteristics of functionally graded carbon nanotube-reinforced composite (FG-CNTRC) plates. The von K acute accent arm acute accent an nonlinear vibration problem is numerically formulated in the framework of 2-D natural element method (NEM) and the (1,1,0)* hierarchical model which is equivalent to the first-order shear deformation theory. The selectively reduced integration technique is employed to suppress the shear locking, and the resulting nonlinear modal equation is solved by a three-step direct iterative scheme. The nonlinearity in free vibration is evaluated in terms of the nonlinear to linear fundamental frequency ratio with respect to the relative vibration amplitude. Through the comparison with the other reference methods, the reliability of present nonlinear method is verified with the maximum relative difference less than 8.0%. The nonlinear free vibration characteristics FG-CNTRC plates are parametrically investigated with respect to the gradient pattern and volume fraction of CNTs and the relative thickness and aspect ratio of plates. The gradient pattern gives rise to the significant affect and the relative thickness and the aspect ratio shows the bounded effect, while the variation to the volume fraction of CNTs is found to be insignificant.
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