On global bending–shear core transition effects for the vibroacoustic of sandwich structures: Analytical and numerical investigations

Baho, O.; Zergoune, Zakaria; Ichchou, Mohamed; Harras, B.; Benamar, Rhali; Troclet, Bernard; Bareille, Olivier

doi:10.1016/j.compstruct.2016.07.062

Cited by 7 publications

(8 citation statements)

References 16 publications

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“…The analysis of transition frequencies does not correspond only to the study at specific frequencies but also to transition ranges in which the structure can be characterized by a specific dynamic behavior. It can be defined in terms of wavemotion [39] but also in terms of strain energy [43].…”

Section: Transition Frequencymentioning

confidence: 99%

“…The analytical formulation of the flexural waves can be used to perform a numerical identification using the WFEM to obtain the dynamic bending and shear modulus. Similarly, this numerical identification strategy can be applied on the group velocity of bending waves [43,44]. Besides, an energetic method based on the calculation of the wavemode energy and the energy storage inside the core and the skins turned out the conversion of bending waves into shear waves located in the core.…”

Section: Introductionmentioning

confidence: 99%

“…This latter method is based on the finite element model of the unit cell and thus, depends only on the accuracy of the mesh. All described methods were applied on a sandwich panel made of a honeycomb core in Baho et al [43]. The second transition frequency occurs when flexural waves are mainly located in the skins.…”

Section: Introductionmentioning

confidence: 99%

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On the multi-scale vibroacoustic behavior of multi-layer rectangular core topology systems

Guenfoud

Droz

Ichchou

et al. 2020

Mechanical Systems and Signal Processing

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The present work deals with multi-layer rectangular core topology systems built up by stacking layers made of different rectangular core geometries. Multi-layer systems have been intensively studied in terms of mechanical performances whereas their vibroacoustic behavior, acoustic efficiency and design is however still an open issue. Several design parameters should be considered to fully understand the dynamic and acoustic behaviour of such structures. Therefore, this paper focuses on controlling the transition frequency and the Sound Transmission Loss (STL) by modifying geometrical parameters of the unit cell, while keeping the mass constant. Infinite panels and real wavenumbers will be considered in the study. The Wave Finite Element Method (WFEM) is used to obtain the targeted indicators. The proposed designs give the opportunity to shift the transition frequency and to control the flexural waves propagating in the structure. Besides, the STL is highly improved in the full frequency range of interest compared to a standard sandwich panel made of a single core.

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Section: Transition Frequencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the multi-scale vibroacoustic behavior of multi-layer rectangular core topology systems

Guenfoud

Droz

Ichchou

et al. 2020

Mechanical Systems and Signal Processing

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“…Baho et al [17], for instance, used a wavemode energy method, coupled with a wave assurance criterion, to predict the transition frequency of honeycomb panels modelled using a single periodic cells. In addition, the core geometry effects on the shear-core transition and sound transmission loss of honeycomb sandwich plates, are investigated in [18].…”

Section: Introductionmentioning

confidence: 99%

Investigations about periodic design for broadband increased sound transmission loss of sandwich panels using 3D-printed models

Errico

Ichchou

Rosa

et al. 2020

Mechanical Systems and Signal Processing

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Two types of sandwich panels are designed by using the periodic structure theory. A double-wall panel with mechanical links and a sandwich panel with rectangular core are studied. An oriented optimization of the elastic bending waves' propagation versus the acoustic wavenumbers is achieved by using shifted core walls and by keeping the mass and stiffness of the system constant. Standard and optimized configurations are 3D-printed and sound transmission measurements are carried out by using a facility with an uncoupled reverberant-anechoic configuration. The experimental evidences of enlarged bending band-gaps and deformation mechanisms are proved using a reverse approach based on the acoustic radiation of the panels.

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“…There have been many investigations aiming the modeling of the behavior of sandwich beam under Bending load [28][29][30] has been extensively investigated for both the static 3-Point Bending [31][32][33][34][35] and static 4-Point Bending [36][37][38][39]. There are also different studies with respect to the modeling of honeycomb sandwich structures especially [40,41].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Analysis the Impact of Unsymmetrical Bending on Aluminum Honeycomb Sandwich Beams with Polyester Resin/Glass Fibers Using Finite Element Method

Ghelloudj¹

2020

RCMA

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Sandwich structures are low-weight and have the best stiffness and a relatively high flexural strength, what makes using them continues to increase rapidly for industrial applications ranging from aeronautics, road vehicles, satellites, ships and civil engineering to mention only a few. The paper presents investigation and analysis of the behavior of composite sandwich beams with polyester resin/glass fibers skins (T800/M300) and aluminum honeycomb core under unsymmetrical bending impact. In this work we propose a numerical study using a calculation software, structural analysis by finite element method (CAST3M), for determining the stresses and displacements. The results which have been obtained after numerical modeling showed that unsymmetrical bending resistance of the sandwich beam is dependent largely on the skins.

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On global bending–shear core transition effects for the vibroacoustic of sandwich structures: Analytical and numerical investigations

Cited by 7 publications

References 16 publications

On the multi-scale vibroacoustic behavior of multi-layer rectangular core topology systems

On the multi-scale vibroacoustic behavior of multi-layer rectangular core topology systems

Investigations about periodic design for broadband increased sound transmission loss of sandwich panels using 3D-printed models

Modeling and Analysis the Impact of Unsymmetrical Bending on Aluminum Honeycomb Sandwich Beams with Polyester Resin/Glass Fibers Using Finite Element Method

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