Global buckling analysis of composite honeycomb sandwich plate with negative Poisson’s ratio (CHSP-NPR) using variational asymptotic equivalent model

2021 ◽  
Vol 264 ◽  
pp. 113721
Author(s):  
Peng Xiao ◽  
Zhong Yifeng ◽  
Shi Jie ◽  
Shi Zheng
Keyword(s):  
Sandwich Plate ◽  
Buckling Analysis ◽  
Poisson's Ratio ◽  
Equivalent Model ◽  
Negative Poisson’S Ratio ◽  
Honeycomb Sandwich ◽  
Honeycomb Sandwich Plate ◽  
Variational Asymptotic ◽  
Global Buckling ◽  
Negative Poisson's Ratio

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.

scholarly journals Vibration and Flutter of a Honeycomb Sandwich Plate with Zero Poisson’s Ratio

Mathematics ◽  
2021 ◽  
Vol 9 (19) ◽  
pp. 2528
Author(s):  
Junhua Zhang ◽  
Zhaochen Yan ◽  
Lili Xia
Keyword(s):  
Poisson’S Ratio ◽  
Sandwich Plate ◽  
Natural Frequencies ◽  
Free Vibrations ◽  
Geometric Parameters ◽  
Poisson's Ratio ◽  
Honeycomb Core ◽  
Honeycomb Sandwich ◽  
Honeycomb Sandwich Plate ◽  
Honeycomb Cores

A honeycomb is a kind of excellent lightweight structure and a honeycomb sandwich plate with zero Poisson’s ratio (ZPR) core is used widely in morphing structures. In this paper, a sandwich plate composed of a honeycomb core with zero Poisson’s ratio is analyzed for free vibrations and flutter under supersonic airflows. The equivalent elastic parametric formulas of the honeycomb core for zero Poisson’s ratio are proposed. The models are compared for their natural frequencies by theoretical and finite element methods respectively, which verifies the validity of the equivalent elastic parametric formulas and the model for the honeycomb sandwich plate with zero Poisson’s ratio. The influence of the geometric parameters of the honeycomb plate on the vibration frequencies is obtained. Three kinds of honeycomb cores, namely, regular hexagon, auxetic and hybrid with zero Poisson’s ratio, are compared through natural frequencies of the sandwich plate. It is found that the frequency of the zero Poisson’s ratio honeycomb sandwich plate is the second one when the other parameters are the same. The flutter of the honeycomb plate is analyzed by using the first order piston theory under supersonic flows. The critical flutter velocity of the plate is obtained, and the influence of geometric parameters of the honeycomb plate on the critical flutter velocities is obtained.

scholarly journals Lightweight Design of Solar UAV Wing Structures Based on Sandwich Equivalent Theory

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Hongjun Liu ◽  
Dong Zhou ◽  
Bing Shen ◽  
You Ding
Keyword(s):  
Topology Optimization ◽  
Sandwich Plate ◽  
Lightweight Design ◽  
Equivalent Model ◽  
Three Point Bending ◽  
Equivalent Theory ◽  
Actual Model ◽  
Honeycomb Sandwich ◽  
Honeycomb Sandwich Plate ◽  
Wing Structures

In this paper, an equivalent method based on sandwich plate is deduced, and the equivalent parameters of the honeycomb plate are obtained. With these equivalent parameters, the honeycomb plate equivalent FEM simulation model and actual model are established, and three-point bending simulations of the equivalent model and the actual model three-point are completed. Then, a three-point bending test of a real honeycomb sandwich panel was performed for comparison with the simulation result, which agrees well with the test result and shows the effectiveness of the equivalent model. The equivalent model of honeycomb sandwich plate win ribs is established for structural topology optimization and wing static simulation analysis, and a prototype of the solar UAV is made for flight testing according to the topology optimization results. The simulation and prototype test results indicated that the sandwich equivalent theory is suitable for the lightweight design of solar UAV wing structures with honeycomb sandwich plate materials, and this method can provide a reference for the same type of wing structure design.

Stability Analysis of Smart FG Sandwich Plates with Auxetic Core

2021 ◽  
Author(s):  
Mohammed Sobhy
Keyword(s):  
Power Law ◽  
Poisson’S Ratio ◽  
Sandwich Plate ◽  
Volume Fraction ◽  
Buckling Load ◽  
Poisson's Ratio ◽  
Negative Poisson’S Ratio ◽  
Electric Voltage ◽  
Negative Poisson's Ratio ◽  
Core Thickness

As a new model, functionally graded piezoelectric (FGP) sandwich plate with negative Poisson’s ratio honeycomb core (auxetic core) is considered in this paper. Buckling analysis of the FGP sandwich plate is investigated based on a novel four-unknown shear deformation plate theory. The electrical and mechanical properties of the face layers are continuously varied through the thickness of the layers. This variation is achieved using a power law distribution in terms of the constituents volume fraction. The core layer composed of hexagonal honeycomb cells with negative Poisson’s ratio was made of a metallic material. The sandwich plate is exposed to uniaxial or biaxial compressive loads as well as electric voltage. Five stability differential equations are established based on the principle of virtual work including mechanical and electric loads. The obtained buckling load is compared with that available in the literature. Impacts of various parameters like the power law index, load parameter, external applied voltage, core thickness, boundary conditions and plate geometry on the buckling load of the smart composite plates with auxetic core are investigated. From the numerical results, one can find that the increase of electric voltage and core thickness decreases the buckling load.

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