Applied Mathematics and Mechanics (English Edition) ›› 2025, Vol. 46 ›› Issue (1): 157-176.doi: https://doi.org/10.1007/s10483-025-3207-6

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A six-variable quasi-3D isogeometric approach for free vibration of functionally graded graphene origami-enabled auxeticmetamaterial plates submerged in a fluid medium

Wei CHEN1, Zhihong TANG1, Yufen LIAO1, Linxin PENG2,3,()   

  1. 1.College of Civil Engineering, University of South China, Hengyang 421001, Hunan Province, China
    2.College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China
    3.Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, China
  • Received:2024-06-15 Revised:2024-11-18 Online:2025-01-03 Published:2025-01-06
  • Contact: Linxin PENG E-mail:penglx@gxu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Nos. 12162004 and 11562001) and the Doctoral Research Start-up Fund Project at University of South China (No. Y00043-13)

Abstract:

This paper presents, for the first time, an effective numerical approach based on the isogeometric analysis (IGA) and the six-variable quasi-three dimensional (3D) higher-order shear deformation theory (HSDT) to study the free vibration characteristics of functionally-graded (FG) graphene origami (GOri)-enabled auxetic metamaterial (GOEAM) plates submerged in a fluid medium. The plate theory incorporates the thickness stretching and the effects of transverse shear deformation without using any shear correction factors. The velocity potential function and Bernoulli's equation are used to derive the hydrodynamic pressure acting on the plate surface. Both horizontally and vertically immersed plate configurations are considered here in the form of inertia effects. The plates are composed of multilayer GOEAMs, with the GOri content varying through the plate's thickness in a layer-wise manner. This design results in graded auxetic growth. The material properties are evaluated by mixing rules and a genetic programming (GP)-assisted micromechanical model. The governing equations of motion for the FG-GOEAM plates immersed in a fluid medium are derived by Hamilton's principle. After validating the convergence and accuracy of the present model, a comprehensive parametric study is carried out to examine the effects of the GOri content, GOri distribution pattern, GOri folding degree, fluid level, immersed depth, and geometric parameter on the natural frequencies of the FG-GOEAM plates. The results show that the natural frequencies for the four GOri distribution patterns increase with the increase in the layer number when the lay number is fewer than 10, and then stabilize after the layer number reaches 10. Besides, in general, the natural frequency of the FG-GOEAM plate in a vacuum or fluid increases when the GOri content increases, while decreases when the GOri folding degree increases. Some additional findings related to the numerical results are presented in the conclusions. It is believed that the present results are useful for the precise design and optimization of FG-GOEAM plates immersed in a fluid medium.

Key words: functionally-graded (FG) graphene origami (GOri)-enabled auxetic metamaterial (GOEAM) plate, hydrodynamic pressure, quasi-three dimensional (3D) higher-order shear deformation theory (HSDT), isogeometric analysis (IGA), free vibration

2010 MSC Number: 

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