Geometrical parameters influence on behavior of the sandwich plates with corrugated core (original) (raw)
Simulation study on deformation behavior of sandwich panels with corrugated cores
El-Cezeri Fen ve Mühendislik Dergisi
In this study, the deformation behaviour of sandwich panels structures with different configurations of corrugated cores under the effect of quasi-static bending loading is investigated numerically. The corrugated core consists of cast polyamide (PA6) material with circular, sinusoidal, square, trapezoid, triangular and honeycomb geometries. An Aluminum 6063-T5 plate is used as the skin of the sandwich panel. According to the analysis results, the sandwich panel with a trapezoidal core provided the highest deformation resistance with 6363.6 N. The circular core sandwich panel showed the lowest deformation resistance with 4262.5 N. The sandwich panel with the highest specific carrying and specific energy capacity is the trapezoidal core panel.
1Buckling Analysis of Corrugated Core Sandwich
2014
In an effort to improve structural design of corrugated board packages under compression load, buckling analysis of simply-supported corrugated board panels, which constitute the main load-bearing components of a compression loaded box, has been performed. This paper focuses on prediction of effective (homogenised) properties of the corrugated core and the critical buckling load of a simply-supported board panel. An improved buckling load prediction has been obtained by incorporation of the additional moments produced by transverse shear deformation in the governing differential equation for equilibrium. The buckling load predictions are compared to previous analytical formulations, finite element analysis and experiments.
Comparison of load-carrying behavior between web-core sandwich, stiffened and isotropic plate
Jelovica, J; Romanoff, J. "Comparison of load-carrying behavior between web-core sandwich, stiffened and isotropic plate". In Guedes Soares, Romanoff (Eds.) Analysis and design of marine structures, Taylor and Francis, London, UK. Proc. 4th Int. Conf. on Marine Structures, Espoo, Finland, 2013
This paper investigates theoretically the differences in load-carrying behaviour between web-core sandwich plate, stiffened plate and isotropic plate. Buckling and post-buckling is studied. The study is carried out using two approaches, both solved with the finite element method. The first is a three-dimensional model of the plates. The second approach is the equivalent single-layer theory approach. First-order shear deformation theory is used. The second approach allows plates to the viewed through ABD- and DQ stiffness coefficients. Plates are axially loaded in the web plate/stiffener direction. Simply supported boundary condition is considered with loaded edges kept straight and unloaded edges free to move in-plane. The results show that the buckling load of sandwich plate is 42% to 65% higher than the stiffened plates. The reason is that sand-wich plate is a symmetrical structure where coupling between in-plane and out-of-plane displacements does not exist (B-matrix is equal to zero). Furthermore, breadth-to-thickness ratio (representing local plate slender-ness) is about two times lower in sandwich plate than in stiffened plate which prevents local buckling. On the other hand, buckling load of sandwich plate can be improved by increasing the transverse shear stiffness, e.g. by filling the voids in the core. For the same structural weight, post-buckling stiffness of stiffened plate is somewhat lower than in sandwich, also owing to the B-matrix. Isotropic plate of the same bending stiffness as sandwich plate has higher post-buckling stiffness due to larger in-plane stiffness (A-matrix) or structural weight.
Engineering, Technology & Applied Science Research
Bending response of corrugated core metallic sandwich panels was studied experimentally under three-point bending loading. Two different core configurations were used: the corrugated monolithic core and the corrugated sliced core. The trapezoidal corrugated cores were manufactured from aluminum sheets via a sheet metal bending mould. After the sandwich panel samples were prepared, they were subjected to three-point bending tests. The load and displacement responses of the sandwich panels having different core configurations were obtained from the experimental testing. The influence of the core configuration on the three-point bending response and failure modes was then investigated. The experimental results revealed that the corrugated sliced core configuration exhibited an improved bending performance compared to the corrugated monolithic core configuration.
Torsional and Transversal Stiffness of Orthotropic Sandwich Panels
Materials, 2020
In the present work, an analytical equation describing the plate torsion test taking into account the transverse shear stiffness in sandwich plates is derived and numerically validated. Transverse shear becomes an important component if the analyzed plate or shell is thick with respect to the in-plane dimensions and/or its core has significantly lower stiffness than the outer faces. The popular example of such a sandwich plate is a corrugated cardboard, widely used in the packaging industry. The flat layers of a corrugated board are usually made of thicker (stronger) material than that used for the corrugated layer, the role of which is rather to keep the outer layers at a certain distance, to ensure high bending stiffness of the plate. However, the soft core of such a plate usually has a low transverse shear stiffness, which is often not considered in the plate analysis. Such simplification may lead to significant calculation errors. The paper presents the generalization of the Rei...
Bending response of web-core sandwich plates
Composite Structures, 2007
A theory for the bending response of web-core sandwich plates is presented in this paper. Response is evaluated by transforming an originally discrete core into an equivalent homogenous continuum giving a sandwich plate, which follows, thick-face-plate kinematics. The approach exploits analytical formulations for the determination of the equivalent stiffness properties of the plate. The finite element method is used to determine the internal forces and displacements of the plate for given load and boundary conditions. Thereafter, the periodic structure is reconsidered and the internal forces are used in the stress predictions based on analytical formulations. The validation of the present approach is carried out with 3D FE analyses. The case studies consider various combinations of load and boundary conditions. A good agreement is obtained between the proposed theory and 3D FE analyses.
Frattura ed Integrità Strutturale
In this work the mechanical behaviour of a core reinforced composite sandwich structure is studied. The sandwich employs a Glass Reinforced Polymer (GRP) orthotropic material for both the two external skins and the inner core web. In particular, the core is designed in order to cooperate with the GRP skins in membrane and flexural properties by means of the addition of a corrugated laminate into the foam core. An analytical model has been developed to replace a unit cell of this structure with an orthotropic equivalent thick plate that reproduces the in plane and out of plane behaviour of the original geometry. Different validation procedures have been implemented to verify the quality of the proposed method. At first a comparison has been performed between the analytical model and the original unit cell modelled with a Finite Element mesh. Elementary loading conditions are reproduced and results are compared. Once the reliability of the analytical model was assessed, this homogenised model was implemented within the formulation of a shell finite element. The goal of this step is to simplify the FE analysis of complex structures made of corrugated core sandwiches; in fact, by using the homogenised element, the global response of a real structure can be investigated only with the discretization of its mid-surface. Advantages are mainly in terms of time to solution saving and CAD modelling simplification. Last step is then the comparison between this FE model and experiments made on sandwich beams and panels whose skins and corrugated cores are made of orthotropic cross-ply GRP laminates. Good agreement between experimental and numerical results confirms the validity of the proposed model.
ANALYSIS OF HYBRID SANDWICH PLATE STRUCTURES
IRJET, 2022
Honeycomb sandwich structures are those structures which are mainly in the shape of a honeycomb. These structures are of high strength in addition to its weight therefore the applications of honeycomb structure plate are very important. Due to its high strength to weight ratio and high stiffness it can be used in automobile, aerospace and space structures. The honeycomb structures mainly consist of three parts they are of two face plates and a core. By using different shapes of core and combining them gives a hybrid core with special characteristics. This paper mainly focuses on the hybrid sandwich plate structures and their properties and also to compare the in-plane and out-ofplane compression of honeycomb structures and to conduct the behaviour prediction of honeycomb structure and hybrid structure. In this study buckling analysis, bending analysis and dynamic analysis are done in the hybrid sandwich plate structures and the analysis are done in the finite element analysis software ANSYS.
Homogenization of corrugated core sandwich panels
Composite Structures, 2003
The present work is devoted to the computation of the effective properties of corrugated core sandwich panels. Due to their periodic structure, the homogenization theory is used, based on the asymptotic expansion method. At the leading order, an equivalent Kirchhoff-Love homogeneous plate is derived, with an overall behavior obtained from basic cell problems posed on the three-dimensional period of the panel. The finite element computation of these effective properties is presented in this paper. The accuracy of the homogenization method is proved, since the real panel and equivalent plate responses are very close for membrane and pure bending loadings. However, a discrepancy appears for simple bending loading, underlining that transverse shear effects cannot be neglected. Therefore, a specific study is developed in order to derive the transverse shear stiffness, thus enabling to determine an equivalent Reissner-Mindlin homogeneous plate.
The dynamic response of clamped rectangular Y-frame and corrugated core sandwich plates
European Journal of Mechanics - A/Solids, 2009
The dynamic response of fully clamped, monolithic and sandwich plates of equal areal mass has been measured by loading rectangular plates over a central patch with metal foam projectiles. All plates are made from AISI 304 stainless steel, and the sandwich topologies comprise two identical face-sheets and either Y-frame or corrugated cores. The resistance to shock loading is quantified by the permanent transverse deflection at mid-span of the plates as a function of projectile momentum. At low levels of projectile momentum both types of sandwich plate deflect less than monolithic plates of equal areal mass. However, at higher levels of projectile momentum, the sandwich plates tear while the monolithic plates remain intact. Three-dimensional finite element (FE) calculations adequately predict the measured responses, prior to the onset of tearing. These calculations reveal that the accumulated plastic strains in the front face of the sandwich plates exceed those in the monolithic plates. These high plastic strains lead to failure of the front face sheets of the sandwich plates at lower values of projectile momentum than for the equivalent monolithic plates.