scholarly journals Forced Vibrations of Pre-Stressed Sandwich Plate-Strip with Elastic Layers and Piezoelectric Core*

2018 ◽  
Vol 54 (4) ◽  
pp. 480-493
Author(s):  
A. Dașdemir
Keyword(s):  
Sandwich Plate ◽  
Forced Vibrations ◽  
Plate Strip ◽  
Elastic Layers

scholarly journals On the Modeling of Periodic Sandwich Structures with the Use of the Broken Line Hypothesis

2020 ◽  
Vol 22 (3) ◽  
pp. 761-774 ◽  
Author(s):  
Jakub Marczak
Keyword(s):  
Vibration Analysis ◽  
Sandwich Plate ◽  
Equations Of Motion ◽  
Free Vibration Analysis ◽  
System Of Equations ◽  
Governing Equations ◽  
Fem Model ◽  
Constant Coefficients ◽  
Plate Strip ◽  
Periodic Plate

AbstractIn this paper a dynamic analysis of sandwich plate with a certain periodic microstructure is considered. The initial system of governing equations is derived basing on the classic broken line hypothesis. As a result of transformations one can obtain a system of three differential equations of motion with periodic, highly oscillating and non-continuous coefficients. In order to derive a system of equations with constant coefficients tolerance averaging technique is applied. Eventually, in the calculation example a free vibration analysis of certain periodic plate strip is performed with the use of both the derived model and a FEM model. It can be observed that the consistency of obtained results is highly dependent on the calculation assumptions.

Vibration of a sandwich plate strip of linearly varying thickness

AIAA Journal ◽  
1993 ◽  
Vol 31 (2) ◽  
pp. 356-361 ◽  
Author(s):  
A. P. Gupta ◽  
R. R. Bhargava
Keyword(s):  
Sandwich Plate ◽  
Varying Thickness ◽  
Plate Strip

Shear actuation-based hybrid damping treatment of sandwich structures using a graphite particle-filled viscoelastic layer

2021 ◽  
pp. 1045389X2110026
Author(s):  
Abhay Gupta ◽  
Satyajit Panda ◽  
Rajidi Shashidhar Reddy
Keyword(s):  
Graphite Particle ◽  
Sandwich Plate ◽  
Volume Fraction ◽  
Shear Mode ◽  
Passive Damping ◽  
Graphite Particles ◽  
The Core ◽  
Active Layers ◽  
Plate Strip ◽  
Hybrid Damping

In this work, the effectiveness of a shear actuation-based hybrid active-passive damping treatment is investigated by incorporating the inclusion of graphite particles within the viscoelastic damping layer. The study is performed through the flexural vibration analysis of a sandwich plate-strip where the core is made of a laminate of active layers and graphite particle-filled viscoelastic layers in two different stacking sequences. The active layers are comprised of shear mode piezoelectric actuator patches that are activated according to a shear-based velocity feedback control strategy. The analysis is performed by deriving a closed-loop finite element model of the sandwich plate-strip, and it reveals that the hybrid damping is significantly dependent on the stacking sequence of active and passive damping layers at the core. The inclusion of graphite particles not only provides augmented passive damping but also causes enhanced transfer of shear actuation force from the active layers to other layers. As a result, a significantly improved shear actuation-based hybrid active-passive damping is achieved due to the inclusion. The effectiveness of this hybrid damping in attenuation of resonant displacement-amplitude is also presented by configuring the volume fraction of graphite particles and shear actuator patches in an optimal manner.

scholarly journals Analytical, FEM-numerical and experimental studies of bending of a sandwich plate-strip with metal foam core

Rail Vehicles ◽  
2020 ◽  
pp. 1-19
Author(s):  
Krzysztof Magnucki ◽  
Dennis Alsdorf ◽  
Jerzy Lewiński ◽  
Michał Kowalski ◽  
Alexander Richter ◽  
...  
Keyword(s):  
Sandwich Plate ◽  
Metal Foam ◽  
Experimental Studies ◽  
Foam Core ◽  
Plate Strip

Przedmiotem badań jest trójwarstwowe pasmo płytowe poddane czteropunktowemu zginaniu. Opracowano analityczny model tego pasma, korzystając z klasycznej teorii linii łamanej nazywanej teorią Zig-Zag. W paśmie tym wyróżniono trzy przedziały: dwa brzegowe, w których występuje zginanie i ścinanie oraz jeden środkowy, w którym występuje czyste zginanie. Wyznaczono całkowite ugięcie maksymalne pasma płytowego oraz maksymalne ugięcie odcinka środkowego. Przeprowadzono obliczenia numeryczne metodą elementów skończonych (MES) dla takiego samego modelu pasma, jak wyżej wspomniany model analityczny. Próbę doświadczalną przeprowadzono na stanowisku badawczym w Instytucie Pojazdów Szynowych. Porównano wyniki badań analitycznych, numerycznych i doświadczalnych. Analizowane płyty warstwowe mogą być stosowane, m. in. jako części podłogi lub poszycia pojazdu szynowego.

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