Shear Stiffness for Z-Core Sandwich Panels

Fung, T. C.; Tan, Kang Hai

doi:10.1061/(asce)0733-9445(1998)124:7(809)

Cited by 17 publications

(14 citation statements)

References 2 publications

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“…[12][13][14][15][16][17][18][19][20][21][22] However, these efforts have been applied primarily to constructions utilizing isotropic materials. [12][13][14][15][16][17][18][19][20] Additionally, the references use analytical methods coupled with design curves or finite-element analysis to determine equivalent properties that are then incorporated into a smeared finite-element analysis. While these references provide insight for incorporating transverse shear in the composite fluted-core analysis, a stand-alone method without the cumbersome design curves or analysis methods is preferable.…”

Section: A Analytical Solutionmentioning

confidence: 99%

Evaluation of Analysis Techniques for Fluted-Core Sandwich Cylinders

Lovejoy

Schultz²

2012

53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference

3
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0

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Buckling-critical launch-vehicle structures require structural concepts that have high bending stiffness and low mass. Fluted-core, also known as truss-core, sandwich construction is one such concept. In an effort to identify an analysis method appropriate for the preliminary design of fluted-core cylinders, the current paper presents and compares results from several analysis techniques applied to a specific composite fluted-core test article. The analysis techniques are evaluated in terms of their ease of use and for their appropriateness at certain stages throughout a design analysis cycle (DAC). Current analysis techniques that provide accurate determination of the global buckling load are not readily applicable early in the DAC, such as during preliminary design, because they are too costly to run. An analytical approach that neglects transverse-shear deformation is easily applied during preliminary design, but the lack of transverse-shear deformation results in global buckling load predictions that are significantly higher than those from more detailed analysis methods. The current state of the art is either too complex to be applied for preliminary design, or is incapable of the accuracy required to determine global buckling loads for fluted-core cylinders. Therefore, it is necessary to develop an analytical method for calculating global buckling loads of fluted-core cylinders that includes transverse-shear deformations, and that can be easily incorporated in preliminary design.

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Section: A Analytical Solutionmentioning
confidence: 99%

Evaluation of Analysis Techniques for Fluted-Core Sandwich Cylinders
Lovejoy
¹
,
Schultz²
2012
53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
3
0
0
0
View full text Add to dashboard Cite

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“…Following the above-described general approach, several other more or less refined homogeneisation methods have been proposed [10]. A number of works have extended the Libove's approach to different corrugations, obtaining some closedform analytical solutions for specific geometries [23][24][25][26][27][28]. Some other works have proposed a characterisation of the homogenised element by FEM simulation of the behaviour of the corrugated sandwich elementary cell [29,30].…”

Section: Introductionmentioning
confidence: 99%

Mechanical behavior of a sandwich with corrugated GRP core: numerical modeling and experimental validation
Tumino
¹
,
Ingrassia
²
,
Nigrelli
³

et al. 2014
Frattura Ed Integrità Strutturale
21
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12
0
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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

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“…Because Libove and Hubka's theory is valid only if the cross section of the core stiffeners is symmetrical about a vertical plane, therefore, Fung, Tan and Lok [6] studied the shear stiffness (D Qy ) of C-core sandwich panels. Fung and Tan [7] *Address correspondence to this author at the School of Civil Engineering & Mechanics, Huazhong University of Science & Technology, Luoyu Road 1037#, Hongshan District, Wuhan, Hubei Province, PR China 430074; Tel: +86-27-87557024; E-mail: Cuimingjuan1107@163.com also studied the shear stiffness (D Qy ) of Z-core sandwich panel. They derived the equation for calculating shear stiffness, and verified the accuracy of the equation from experimental results.…”

Section: Introductionmentioning
confidence: 99%

Prediction on Deflection of Box-Core Sandwich Panels in Weak Direction
Mingjuan
¹

2013
TOOEJ
0
0
0
0
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A box-core sandwich panel is consisted of top and bottom facing plates and a core of box-shaped stiffeners connected to facing plates. According to the assumption that shear forces at the mid-height of box-core stiffeners are equal, a typical segment is studied, and the relative displacement at two ends of the typical segment is obtained by using unit load method. Therefore, a theoretical equation for calculating the deflection at the mid-span of a box-core sandwich beam is presented. To verify the accuracy of the equation, finite element software ABAQUS is adopted to carry out a parametric study to investigate the validity range. By comparing the theoretical and numerical results, the accuracy of the equation is verified.

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Shear Stiffness for Z-Core Sandwich Panels

Cited by 17 publications

References 2 publications

Evaluation of Analysis Techniques for Fluted-Core Sandwich Cylinders

Evaluation of Analysis Techniques for Fluted-Core Sandwich Cylinders

Mechanical behavior of a sandwich with corrugated GRP core: numerical modeling and experimental validation

Prediction on Deflection of Box-Core Sandwich Panels in Weak Direction

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