Geometrical parameters influence on behavior of the sandwich plates with corrugated core (original) (raw)
Related papers
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...
Shape optimization of a sandwich plate with a novel core design
2018
2. TENSION TESTS In the first stage of the study, the mechanical properties of the composite material are determined. A procedure is proposed to determine these properties using tension test and acoustic emission (AE) results for specimens with 0/45/ 45/90 and 0/90 layup sequences and a progressive failure model. Using this procedure, longitudinal and transverse tensile strengths, and , shear strength, , together with the stiffness properties can be obtained. Tension tests are conducted according to ASTM D3039 standard testing procedure. The strain of the specimen is measured by a video extensometer. Fig. 2 shows the peak frequency distribution as well as the energy levels of AE hits for a quasiisotropic specimen, 0/45/ 45/90 , together with the load-strain curve. Ply-failure load levels, which are indicated on the graph, are determined considering the changes in the load-displacement diagram as well as the AE signals. Fig. 3 shows a comparison between the experimental load-strain c...
Experimental investigation of the static behaviour of a corrugated plywood sandwich core
Composite Structures, 2019
Sandwich panel structures comprising corrugated plywood core bonded between plywood face sheets were manufactured and tested in flatwise compression and bending. Thin 3-ply Radiata pine veneers were soaked in a hot water bath prior to forming in a heated matched die, resulting in a corrugated profile with a 9 mm height and 43 mm period. Sandwich panel specimens were assembled via a simple process of applying an epoxy adhesive along the joints of the corrugated core and plywood face-sheets and holding in position while the epoxy cured. Through-thickness compressive modulus and strength were tested following the method of ASTM C365. As compared to single layer core, double layer core had a similar modulus, but reduced strength due to instability at the joints between the corrugation layers. Bending behaviour of sandwich beams was investigated in both the corrugated core orientations, revealing that the core was stiffer in shear across the corrugations, but also weaker in this orientation, due to face sheet buckling. This work sets the foundation for future research involving the prediction of properties and experimentation with different core configurations.
Materials, 2021
Knowing the material properties of individual layers of the corrugated plate structures and the geometry of its cross-section, the effective material parameters of the equivalent plate can be calculated. This can be problematic, especially if the transverse shear stiffness is also necessary for the correct description of the equivalent plate performance. In this work, the method proposed by Biancolini is extended to include the possibility of determining, apart from the tensile and flexural stiffnesses, also the transverse shear stiffness of the homogenized corrugated board. The method is based on the strain energy equivalence between the full numerical 3D model of the corrugated board and its Reissner-Mindlin flat plate representation. Shell finite elements were used in this study to accurately reflect the geometry of the corrugated board. In the method presented here, the finite element method is only used to compose the initial global stiffness matrix, which is then condensed and...
Equivalent properties for corrugated cores of sandwich structures: A general analytical method
Composite Structures, 2014
Corrugated core sandwich panels are increasingly used as multi-functional components in many industrial areas. Nevertheless, for efficient finite element analysis, the sandwich construction can be represented as a multilayer two-dimensional continuum. To do so, the complex shaped core of these structures is usually represented as an orthotropic homogeneous layer. The challenge is therefore to determine the mechanical properties of the equivalent material to accurately reduce the panel. Several methods exist in literature, but analytical formulations are only available for specific types of core.
Free Vibration and Buckling Analysis of Stiffened Sandwich Plates with Repeated Fold
Journal of The Institution of Engineers (India): Series C, 2021
In this paper, complex-shaped sandwich folded plate structures with and without stiffeners have been analyzed using first-order shear deformation theory. Finite element analysis using eight-noded isoparametric serendipity elements has been used. Regular plate elements have been applied to model the plates and stiffeners. Transformation matrices have been used to form the global stiffness matrix. Effect of different boundary conditions, fiber angles and core thicknesses has been discussed. Different stiffener arrangements have been analyzed to study their effects. Numerical results reveal that the fixed edge of folded plate increases the stiffness prominently. Also, proper positioning of stiffeners can significantly increase the stiffness and hence the natural frequency and the buckling load.