Nonlinear bending of sandwich beams with functionally graded negative Poisson’s ratio honeycomb core

2019 ◽  
Vol 212 ◽  
pp. 317-325 ◽  
Author(s):  
Chong Li ◽  
Hui-Shen Shen ◽  
Hai Wang
Keyword(s):  
Poisson’S Ratio ◽  
Functionally Graded ◽  
Poisson's Ratio ◽  
Sandwich Beams ◽  
Negative Poisson’S Ratio ◽  
Honeycomb Core ◽  
Nonlinear Bending ◽  
Negative Poisson's Ratio

Nonlinear Vibration of Sandwich Beams with Functionally Graded Negative Poisson’s Ratio Honeycomb Core

2019 ◽  
Vol 19 (03) ◽  
pp. 1950034 ◽  
Author(s):  
Chong Li ◽  
Hui-Shen Shen ◽  
Hai Wang
Keyword(s):  
Nonlinear Vibration ◽  
Poisson’S Ratio ◽  
Sandwich Beam ◽  
Flexural Vibration ◽  
Functionally Graded ◽  
Poisson's Ratio ◽  
Sandwich Beams ◽  
Negative Poisson’S Ratio ◽  
Honeycomb Core ◽  
Negative Poisson's Ratio

This paper investigates the nonlinear flexural vibration of sandwich beams with functionally graded (FG) negative Poisson’s ratio (NPR) honeycomb core in thermal environments. The novel constructions of sandwich beams with three FG configurations of re-entrant honeycomb cores through the beam thickness direction are proposed. The temperature-dependent material properties of both face sheets and core of the sandwich beams are considered. 3D full-scale finite element analyses are conducted to investigate the nonlinear vibration, and the variation of effective Poisson’s ratio (EPR) of the sandwich beams in the large deflection region. Numerical simulations are carried out for the sandwich beam with FG-NPR honeycomb core in different thermal environmental conditions, from which results for the same sandwich beam with uniform distributed NPR honeycomb core are obtained as a basis for comparison. The effects of FG configurations, temperature changes, boundary conditions, and facesheet-to-core thickness ratios on the nonlinear vibration ratio curves and EPR–deflection curves of sandwich beams are discussed in detail.

Free vibration and sound insulation of functionally graded honeycomb sandwich plates

2021 ◽  
pp. 109963622110204
Author(s):  
Fenglian Li ◽  
Wenhao Yuan ◽  
Chuanzeng Zhang
Keyword(s):  
Free Vibration ◽  
Poisson’S Ratio ◽  
Functionally Graded ◽  
Poisson's Ratio ◽  
Dynamic Equations ◽  
Sound Insulation ◽  
Sandwich Plates ◽  
Negative Poisson’S Ratio ◽  
Honeycomb Sandwich ◽  
Negative Poisson's Ratio

Based on the hyperbolic tangent shear deformation theory, free vibration and sound insulation of two different types of functionally graded (FG) honeycomb sandwich plates with negative Poisson’s ratio are studied in this paper. Using Hamilton’s principle, the vibration and vibro-acoustic coupling dynamic equations for FG honeycomb sandwich plates with simply supported edges are established. By applying the Navier’s method and fluid–solid interface conditions, the derived governing dynamic equations are solved. The natural frequencies and the sound insulation of FG honeycomb sandwich plates obtained in this work are compared with the numerical results by the finite element simulation. It is proven that the theoretical models for the free vibration and the sound insulation are accurate and efficient. Moreover, FG sandwich plates with different honeycomb cores are investigated and compared. The corresponding results show that the FG honeycomb core with negative Poisson’s ratio can yield much lower frequencies. Then, the influences of various geometrical and material parameters on the vibration and sound insulation performance are systematically analyzed.

In-plane elasticity of a novel vertical strut combined re-entrant honeycomb structure with negative Poisson’s ratio

2021 ◽  
Vol 163 ◽  
pp. 107634
Author(s):  
Xiaolong Zhang ◽  
Ruilan Tian ◽  
Ziwen Zhang ◽  
Guijing Li ◽  
Wenjie Feng
Keyword(s):  
Poisson’S Ratio ◽  
Honeycomb Structure ◽  
Plane Elasticity ◽  
Poisson's Ratio ◽  
Negative Poisson’S Ratio ◽  
Negative Poisson's Ratio
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