scholarly journals STATIC BENDING STRENGTH OF SANDWICH COMPOSITE PLATES WITH TETRACHIRAL HONEYCOMBS

2021 ◽  
Vol 17 (3) ◽  
pp. 102-113
Author(s):  
Alexey Mazaev ◽  
Marina Shitikova
Keyword(s):  
Relative Density ◽  
Bending Strength ◽  
Composite Plates ◽  
Core Layer ◽  
Theory Of Elasticity ◽  
Sandwich Composite ◽  
Constant Thickness ◽  
Strength Analysis ◽  
Sandwich Plates ◽  
Honeycomb Core

The article presents a numerical strength analysis of sandwich plates with solid face layers and tetrachiral honeycomb core layer under static bending conditions. An aluminum alloy was chosen as the material of plates. For honeycomb core layers, the discretization (number of unit cells) and the relative density were varied with a constant thickness. Calculations were performed for the case of bending with rigidly clamped ends and three-point bending within the framework of the theory of elasticity by the finite element method. The strength analysis enables one to determine the load values, at which the maximal stresses according to the von Mises criterion were equal to the conventional yield stress of the material. The aim of this work is to study the effect of discretization and relative density of honeycomb core layers of tetrachiral type on the str ength of sandwich plates.

scholarly journals Free vibration and dynamic response of sandwich composite plates with auxetic honeycomb core

2021 ◽  
Vol 15 (4) ◽  
pp. 1-14
Author(s):  
Tran Huu Quoc ◽  
Tran Minh Tu ◽  
Vu Van Tham
Keyword(s):  
Free Vibration ◽  
Shear Deformation Theory ◽  
Composite Plates ◽  
Core Layer ◽  
Element Model ◽  
Dynamic Responses ◽  
Sandwich Composite ◽  
Geometrical Parameters ◽  
Sandwich Plates ◽  
Discrete Shear Gap

This paper deals with the free vibration and dynamic responses of composite sandwich plates. The sandwich plate has three layers in which two face sheets are made of isotropic material, and the core layer is made of auxetic honeycomb structures with a negative Poisson's ratio.  A smoothed finite element model based on the first-order shear deformation theory is established for the analysis purpose. In the model, only the linear approximation is necessary, and the discrete shear gap method for triangular plate elements is used to avoid the shear locking. The Newmark direct integration technique is used to capture the dynamic responses of the sandwich plates. The convergence study is made, and the accuracy of present results is validated by comparison with available data in the literature. The influence of geometrical parameters, material properties, and boundary conditions are explored and discussed. Numerical results show that auxetic materials have several different responses compared to conventional materials, and these behaviors are strongly influenced by the internal structure of the auxetic material.

Buckling Behaviour of the Delaminated Sandwich Plates under Combined Loads

2014 ◽  
Vol 601 ◽  
pp. 88-91
Author(s):  
Elena Felicia Beznea ◽  
Ionel Chirica
Keyword(s):  
Axial Compression ◽  
Composite Plates ◽  
Sandwich Composite ◽  
Sandwich Plates ◽  
Compression Loading ◽  
Numerical Tests ◽  
Boundary Shear ◽  
Combined Loads ◽  
Hull Structure ◽  
Loading Ratio

In the paper, a methodology to evaluate the influence of the central circular delamination on the buckling and postbuckling behaviour of the sandwich plates under shear and compression loading, used in ship hull structure, is presented. The parametric calculus was done for various values of loading ratios. The numerical tests on the delaminated plates are presented. Sandwich composite plates containing central delaminations are analyzed with respect to combined boundary shear and axial compression buckling. Finally, the graphical results for all values of loading ratio are presented.

Static analysis of laminated and sandwich composite plates based on simple refined higher-order displacement theory

2010 ◽  
Vol 32 (2) ◽  
pp. 95-106
Author(s):  
Tran Minh Tu
Keyword(s):  
Finite Element ◽  
Static Analysis ◽  
Composite Plates ◽  
Higher Order ◽  
Sandwich Composite ◽  
Sandwich Plates ◽  
Present Formulation ◽  
Numerical Examples ◽  
Displacement Theory ◽  
Different Thickness

A simple refined higher-order displacement theory is used for the static analysis of laminated and sandwich plates. Both analytical and finite element solutions are developed. Numerical examples of laminated and sandwich plates are given for different thickness ratios, length-to-thickness ratios to illustrate the accuracy of the present formulation by comparing the present results with results already available in the literature.

Bending and compression of glass fabric-corrugated paper–epoxy sandwich composites

2020 ◽  
Vol 34 (07n09) ◽  
pp. 2040003
Author(s):  
Jieng-Chiang Chen ◽  
Xiu-Zhi Yang
Keyword(s):  
Bending Strength ◽  
Core Layer ◽  
Test System ◽  
Glass Fabric ◽  
Sandwich Composite ◽  
Sandwich Composites ◽  
The Core ◽  
Compression Properties ◽  
Composite Glass ◽  
Corrugated Paper

The manufacturing procedures of sandwich composites containing corrugated paper (CP) as a core layer and covered with glass fabrics are discussed herein. The core layer of the sandwich composite was fabricated with CP-reinforced epoxy (E) resin and then stacked with glass fabric on the top and bottom surfaces to fabricate the sandwich composites. Three composites [a CP-reinforced E (CP/E) composite, glass fiber nonwoven mat (GN) sandwich composite with a CP core layer (GN/E/CP) and glass mesh fabric (GM) sandwich composite with a CP core layer (GM/E/CP)] were developed in this study. The bending and compression properties of these sandwich composites were measured on a materials test system. Experimental results revealed that the bending strength of the GN/E/CP sandwich composite was approximately 45% and 150% higher than those of the GM/E/CP and CP/E sandwich composites, respectively.

A data mining approach to the diagnosis of failure modes for two serial fastened sandwich composite plates

2016 ◽  
Vol 51 (20) ◽  
pp. 2853-2862 ◽  
Author(s):  
Serkan Ballı
Keyword(s):  
Data Mining ◽  
Random Forest ◽  
Failure Modes ◽  
Composite Plates ◽  
Study Data ◽  
Sandwich Composite ◽  
Support Vector ◽  
Geometrical Parameters ◽  
Mining Methods

The aim of this study is to diagnose and classify the failure modes for two serial fastened sandwich composite plates using data mining techniques. The composite material used in the study was manufactured using glass fiber reinforced layer and aluminum sheets. Obtained results of previous experimental study for sandwich composite plates, which were mechanically fastened with two serial pins or bolts were used for classification of failure modes. Furthermore, experimental data from previous study consists of different geometrical parameters for various applied preload moments as 0 (pinned), 2, 3, 4, and 5 Nm (bolted). In this study, data mining methods were applied by using these geometrical parameters and pinned/bolted joint configurations. Therefore, three geometrical parameters and 100 test data were used for classification by utilizing support vector machine, Naive Bayes, K-Nearest Neighbors, Logistic Regression, and Random Forest methods. According to experiments, Random Forest method achieved better results than others and it was appropriate for diagnosing and classification of the failure modes. Performances of all data mining methods used were discussed in terms of accuracy and error ratios.

Multi-Objective Optimal Design of Sandwich Composite Laminates Using Simulated Annealing and FEM

2008 ◽  
Author(s):  
A. Sarhadi ◽  
M. Tahani ◽  
F. Kolahan ◽  
M. Sarhadi
Keyword(s):  
Simulated Annealing ◽  
Optimal Design ◽  
Composite Laminates ◽  
Composite Structures ◽  
Simulated Annealing Algorithm ◽  
Core Layer ◽  
Sandwich Composite ◽  
Surface Layers ◽  
Multi Objective ◽  
Aspect Ratios

Multi-objective optimal design of sandwich composite laminates consisting of high stiffness and expensive surface layers and low-stiffness and inexpensive core layer is addressed in this paper. The object is to determine ply angles and number of surface layers and core thickness in such way that natural frequency is maximized with minimal material cost and weight. A simulated annealing algorithm with finite element method is used for simultaneous cost and weight minimization and frequency maximization. The proposed procedure is applied to Graphite-Epoxy/Glass-Epoxy and Graphite-epoxy/Aluminum sandwich laminates and results are obtained for various boundary conditions and aspect ratios. Results show that this technique is useful in designing of effective, competitive and light composite structures.

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