Vibro-acoustic response of sandwich plates with functionally graded core

Chandra, Namas; Gopal, K.V. Nagendra; Raja, S.

doi:10.1007/s00707-015-1513-1

Cited by 36 publications

(20 citation statements)

References 38 publications

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“…In the aforementioned double wall investigations, only the panels or shells were made with FGM. However, the core of the DPS can be made of FGM as demonstrated by Chandra et al [87]. Other notable authors [88][89][90][91][92] have adopted the FGM to model the vibro-acoustic response of structural panels.…”

Section: Functionally Graded Materials Of Sandwich Structuresmentioning

confidence: 99%

Comparative Study of Sound Transmission Losses of Sandwich Composite Double Panel Walls

2020

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The increasing motivation behind the recently wide industrial applications of sandwich and composite double panel structures stems from their ability to absorb sounds more effectively. Meticulous selection of the geometrical and material constituents of both the core and panels of these structures can produce highly desirable properties. A good understanding of their vibro-acoustic response and emission index such as the sound transmission loss (STL) is, therefore, a requisite to producing optimal design. In this study, an overview of recent advances in STL of sandwich and composites double panels is presented. At first, some salient explanation of the various frequency and controlled regions are given. It then critically examines a number of parameter effects on the STL of sandwich and composite structures. Literatures on the numerical, analytical and experimental solutions of STL are systematically presented. Efficient and more reliable optimization problems that maximize the STL and minimize the objective functions capable of degrading the effectiveness of the structure to absorb sounds are also provided.

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Section: Functionally Graded Materials Of Sandwich Structuresmentioning

confidence: 99%

Comparative Study of Sound Transmission Losses of Sandwich Composite Double Panel Walls

2020

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“…A typical composite sandwich panel is designed with two thin face sheets having very high strengths, which are connected by a thick core of low density [1,2]. Composite sandwiches show good mechanical properties hence they are widely used in various engineering structures in civil, aerospace, and automotive industries, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Composite sandwiches show good mechanical properties hence they are widely used in various engineering structures in civil, aerospace, and automotive industries, etc. [1]. Usually synthetic foam cores and honeycomb cores are used for different applications, for example the foam core based sandwich is used in cladding panels [3], floors in buildings [4], decks in bridge structures [5,6], wind turbine blades [6] and ship buildings [7], whilst the honeycomb core based sandwich is used to manufacture various parts in aerospace, automobile and sporting [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Usually, sandwich panels have fracture problems in the core close to the core-face sheet interfaces due to high value of concentrated shear stresses near the interface region when they are exposed to different types of loadings [11], or they are prone to fracture in the core close to the interfaces due to mismatched material properties between the core and face sheets [1].…”

Section: Introductionmentioning

confidence: 99%

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Predicting fracture mechanisms in synthetic foam sandwiches with multi-layered cores using extended cohesive damage model

Ghimire

Chen

2020

Engineering Fracture Mechanics

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This paper introduces an investigation on fracture mechanisms of synthetic foam sandwiches with graded multi-layered cores. The extended cohesive damage model (ECDM) is used in investigating detailed fracture mechanisms of this kind of synthetic foam sandwich panels under quasi-static 3-point bending. The ECDM prediction shows very good agreements with experimental work on investigating the sandwiches with homogeneous core and the core with four graded layers. This investigation has found that the failure modes of sandwich panels with multi-layered cores are sliding shear failure dominated fracture in the core along the path above the core-bottom sheet interface instead of pure debonding at interfaces. It has been also found an excellent mechanical performance when the core has multiple graded layers in the investigated sandwiches compared to the case of homogenous core. It is the first time that the correlation between loading capacity and number of graded layers in the core of the investigated synthetic foam sandwiches is explored. The ECDM predicted loading capacity of the investigated sandwich panel with an 8-layered core is increased by 70% compared to a homogenous core. This investigation also shows that the ECDM is a robust tool for predicting fracture mechanisms of synthetic foam sandwiches.

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“…Besides, the wave propagation on clamped triple-panel was done to show STL of the structure as a function of excitation frequency. Chandra et al (2015) obtained STL of the sandwich plate with functionally core. Recently, Talebitooti et al (2018a) considered two-variable refined theory to obtain acoustic transmission of a plate in the external flow.…”

Section: Introductionmentioning

confidence: 99%

Investigating Hyperbolic Shear Deformation Theory on vibroacoustic behavior of the infinite Functionally Graded thick plate

Talebitooti

Zarastvand

Rouhani

2019

Lat. Am. j. solids struct.

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This paper applies acoustic analysis of Sound Transmission Loss (STL) through infinite Functionally Graded (FG) thick plate employing Hyperbolic Shear Deformation Theory (HSDT). The procedure for applying a FG plate is followed by considering the material properties are changed continually based on power-law distribution of the materials in terms of volume fraction. The main benefit of HSDT can be justified knowing the fact that, it uses parabolic transverse shear strain across thickness direction. Therefore, no need to enter the extra effect of shear correction coefficient factor. Besides, the displacement field is extended as a combination of polynomial as well as hyperbolic tangent function by neglecting the effect of thickness stretching. Furthermore, the equations of motion are obtained employing Hamilton's Principle. To provide an analytical solution based on HSDT, equations of motion are combined with acoustic wave equations. Moreover, some comparisons are made with the known theoretical and experimental results available in literature to verify the accuracy and efficiency of the current formulation. These comparisons reveal an excellent agreement. Consequently, some configurations are presented to demonstrate which parameters appear to be effective to improve the behavior of STL including the effects of modulus of elasticity and density in the thickness direction with respect to various power-law distributions.

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Vibro-acoustic response of sandwich plates with functionally graded core

Cited by 36 publications

References 38 publications

Comparative Study of Sound Transmission Losses of Sandwich Composite Double Panel Walls

Comparative Study of Sound Transmission Losses of Sandwich Composite Double Panel Walls

Predicting fracture mechanisms in synthetic foam sandwiches with multi-layered cores using extended cohesive damage model

Investigating Hyperbolic Shear Deformation Theory on vibroacoustic behavior of the infinite Functionally Graded thick plate

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