Effect of Face-Sheet Anisotropy on Buckling and Postbuckling of Sandwich Plates

2000 ◽  
Vol 37 (3) ◽  
pp. 331-341 ◽  
Author(s):  
Terry Hause ◽  
Theodore F. Johnson ◽  
Liviu Librescu
Keyword(s):  
Face Sheet ◽  
Sandwich Plates

Experimental and numerical investigation on the anti-penetration performance of metallic sandwich plates for marine applications

2019 ◽  
Vol 22 (2) ◽  
pp. 494-522 ◽  
Author(s):  
Na Zhao ◽  
Renchuan Ye ◽  
Ali Tian ◽  
Jie Cui ◽  
Peng Ren ◽  
...  
Keyword(s):  
Aluminum Foam ◽  
Failure Modes ◽  
Sheet Thickness ◽  
Face Sheet ◽  
Sandwich Plates ◽  
Ballistic Limit ◽  
Ballistic Performance ◽  
Core Thickness ◽  
Protective Structures ◽  
Constitutive Parameters

To predict the anti-penetration performance of protective structures, the ballistic performance of sandwich plates with steel face-sheet and aluminum foam core, the quasi-static compressive experiments of four different aluminum foam are performed and analyzed. The failure mechanism, mechanical parameters, and modified constitutive model are obtained. The virtual tests using numerical simulation were carried out in different penetration velocities based on quasi-static experimental constitutive parameters. Influence of projectile shape, face-sheet thickness, core thickness, and core densities on the residual velocity and plastic deformation of sandwich plates are discussed, while typical penetration failure modes and deformation mechanism are presented and analyzed. The failure modes of sandwich plates are different for hemisphere- and blunted-nosed projectile and the projectile shape influence is significant for ballistic performance when the penetration velocity approaches ballistic limit. The ballistic limit increases with increase of face-sheet or core thickness, core density and which shows an approximate linear relationship.

Dynamic Response of Metallic Y-Frame Core Sandwich Panels Subjected to Air Blast Loading: Numerical Investigation

2019 ◽  
Author(s):  
Ting Liu ◽  
Yuansheng Cheng ◽  
Jun Liu ◽  
Ganchao Chen ◽  
Changhai Chen ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Sandwich Panel ◽  
Sandwich Panels ◽  
Face Sheet ◽  
Front Face ◽  
Sandwich Plates ◽  
Air Blast ◽  
Solid Plate ◽  
Blast Performance ◽  
Air Blast Loading

Abstract In this paper, the dynamic response of metallic Y-frame core sandwich plates subjected to air blast loading was investigated by employing the LS-DYNA software. The blast wave was generated by the directly detonation of TNT explosives. The deformation/failure modes and associated structural response were identified and analyzed in detail. Main attention was paid to explore the effects of face sheet thicknesses and core web thickness on the deformation response of Y-frame core sandwich plates. A comparison on the blast performance were drawn among the Y-frame core sandwich panel, corrugated core sandwich panel and solid plate in equal areal mass. Numerical results revealed that the Y-frame core sandwich panel experienced indent deformation in the front face, strut buckling in the core and large bending deformation in the back face under the stand-off distance of 100 mm. Increasing the face sheets and core web thicknesses could improve the blast performance of Y-frame core sandwich panels. The deflections of face sheets were sensitive to the variation of front face sheet and core thicknesses. Moreover, Y-frame sandwich panel has comparable anti-blast capacity with the corrugated counterparts and exhibits superior blast resistance than the solid plate.

Static and Dynamic Behavior of Nanotubes-Reinforced Sandwich Plates Using (FSDT)

2019 ◽  
Vol 57 ◽  
pp. 117-135 ◽  
Author(s):  
Aicha Draoui ◽  
Mohamed Zidour ◽  
Abdelouahed Tounsi ◽  
Belkacem Adim
Keyword(s):  
Carbon Nanotube ◽  
Dynamic Behavior ◽  
Sandwich Plate ◽  
Volume Fraction ◽  
Face Sheet ◽  
Sandwich Plates ◽  
Composite Sandwich ◽  
Aspect Ratios ◽  
Reinforced Composite ◽  
Composite Sandwich Plates

Based on the first order shear deformation plate theory (FSDT) in the present studie, static and dynamic behavior of carbon nanotube-reinforced composite sandwich plates has been analysed. Two types of sandwich plates, namely, the sandwich with face sheet reinforced and homogeneous core and the sandwich with homogeneous face sheet and reinforced core are considered. The face sheet or core plates are reinforced by single-walled carbon nanotubes with two types of distributions of uniaxially aligned reinforcement material which uniformly (UD-CNT) and functionally graded (FG-CNT). The analytical equations are derived and the exact solutions for bending and vibration analyses of such type’s plates are obtained. The mathematical models provided and the present solutions are numerically validated by comparison with some available results in the literature. Influence of Various parameters of reinforced sandwich plates such as aspect ratios, volume fraction, types of reinforcement and plate thickness on the bending and vibration analyses of carbon nanotube-reinforced composite sandwich plates are studied and discussed. The findings suggest that the (FG-CNT) face sheet reinforced sandwich plate has a high resistance against deflections compared to other types of reinforcement. It is also revealed that the reduction in the dimensionless natural frequency is most pronounced in core reinforced sandwich plate.

scholarly journals On free vibration of laminated skew sandwich plates: A finite element analysis

2021 ◽  
Vol 10 (1) ◽  
pp. 66-76
Author(s):  
Pavan Kumar Dhotre ◽  
C. V. Srinivasa
Keyword(s):  
Fundamental Frequency ◽  
Orientation Angle ◽  
Face Sheet ◽  
Design Parameters ◽  
Sandwich Plates ◽  
Skew Angle ◽  
Element Analysis ◽  
Fundamental Frequencies ◽  
Number Of Layers ◽  
The Face

Abstract The present work emphasizes the determination of the fundamental frequency of skew sandwich plates with orthotropic core and laminated facings using different design parameters. Finite elements CQUAD4 and CQUAD8 of MSC/NASTRAN are used for obtaining fundamental frequencies, which are validated against available literature results. The influence of the skew angle, the ratio of the length-to total thickness (a/h) of the sandwich plate, and the ratio of the thickness of the core to face sheet (t c /t h ) on the fundamental frequency of skew sandwich plates are studied. Also, the influence of parameters such as the number of layers in the face sheet, laminate sequence, and fiber orientation angle on the fundamental frequency of laminated skew sandwich plates have been studied. It is found that the CQUAD8 element yields better results than the CQUAD4 element in the present study. The fundamental frequencies are found to increase with the increasing skew angle. The variation in fundamental frequency is negligible when the number of layers is large in the face sheet.

Sandwich Plates Actuated by a Kagome Planar Truss

2004 ◽  
Vol 71 (5) ◽  
pp. 652-662 ◽  
Author(s):  
N. Wicks ◽  
J. W. Hutchinson
Keyword(s):  
Internal Resistance ◽  
Face Sheet ◽  
Sandwich Plates ◽  
Long Wavelength ◽  
Double Curvature ◽  
Truss Core ◽  
Pyramidal Truss ◽  
Kagome Truss ◽  
Optimal Stiffness

Kagome truss plates have properties that suggest they should be uniquely effective as an actuation plane for sandwich plates: a Kagome truss plate has in-plane isotropy, optimal stiffness and strength, and its truss members can be actuated with minimal internal resistance. In this paper, sandwich plates are studied that are comprised of one solid face sheet and one actuated Kagome face sheet joined by a pyramidal truss core. Various aspects of the actuation behavior of these plates are investigated, including internal resistance and strains resulting from actuation and efficiency of actuation. Single and double curvature actuation modes are investigated. Contact is made with analytic results for actuation modes with long wavelength.

Experimental Results for Bending and Buckling of Rectangular Orthotropic Fiber-Reinforced Plastic Plate Structures

1999 ◽  
Vol 36 (01) ◽  
pp. 22-28
Author(s):  
J. C. Roberts ◽  
G. J. White
Keyword(s):  
Uniaxial Compression ◽  
Local Buckling ◽  
Face Sheet ◽  
Stiffened Plates ◽  
Sandwich Plates ◽  
Uniform Pressure ◽  
Fiber Reinforced ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Out Of Plane

Solid unstiffened, sandwich, and hat-stiffened rectangular orthotropic fiber-reinforced plastic (FRP) plates were tested in uniaxial in-plane compression and out-of-plane uniform pressure. The two short edges of all plates were clamped, whereas the two long edges of the unstiffened and sandwich plates were simply supported and the same edges of the hat-stiffened plate were left free. Unstiffened plates reached global buckling at about 688 kN (155 klb); however, the plates did not collapse up to the machine load limit of 1334 kN (300 klb). Sandwich plates never reached the overall elastic buckling load; they collapsed in local buckling by face sheet delamination and core shear failure at loads of about 939 kN (211 klb). Hat-stiffened plates exhibited local buckling of the outer unsupported flanges at a load of about 356 kN (80 klb). All hat-stiffened plates collapsed under uniaxial compression due to a combination of face sheet to stiffener delamination followed by hat-stiffener local buckling at loads of about 939 kN (211 klb). The stresses and deflections due to out-of-plane uniform pressure were compared between the unstiffened, sandwich, and hat-stiffened plates from pressures of 6.895 kPa (1 psi) to 34 kPa (5 psi). With the plates under uniaxial compression and out-of-plane uniform pressure simultaneously, there was a general decrease in buckling and collapse with an increase in out-of-plane uniform pressure.

Generation of ao waves in sandwich plates

2002 ◽  
Vol 90 ◽  
pp. 42-42
Author(s):  
D. Osmont ◽  
D. Barnoncel ◽  
M. Dupont
Keyword(s):  
Sandwich Plates
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