Modeling thick composite laminate and sandwich structures with linear viscoelastic damping

Ghinet, Sebastian; Atalla, Noureddine

doi:10.1016/j.compstruc.2010.09.008

Cited by 50 publications

(37 citation statements)

References 18 publications

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“…Focusing on the less favorable case composed of the thicker silicone layer (0.4mm), the first "breathing mode" occurs at about 6.2 kHz (see [11] for description of the analytical prediction of the breathing mode) which falls above the experimental [10Hz -2kHz] frequency domain of interest. Nevertheless, other models may be used for very thick laminated panels or highly damped laminate composites such as the General Laminate model [13]. The reader could also refer to the work of Carrera [14] where several models are compared.…”

Section: Apparent Young's Modulus and Damping Of Homogeneous Three-lamentioning

confidence: 99%

Spatial Patterning of the Viscoelastic Core Layer of a Hybrid Sandwich Composite Material to Trigger Its Vibro-Acoustic Performances

Gallo¹,

Chesnais²,

Ege³

et al. 2018

SAE Technical Paper Series

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With the aim of decreasing CO2 emissions, car producers' efforts are focused, among others, on reducing the weight of vehicles yet preserving the overall vibrational comfort. To do so, new lightweight materials combining high stiffness and high (passive) damping are sought. For panels essentially loaded in bending, sandwich composites made of two external metallic stiff layers (skins) and an inner polymeric (i.e. absorbing) core are broadly used. Now aiming at creating materials by design with a better control of the final performance of the part, the tuning of the local material properties is pursued. To this end, the present work focuses on controlling the spatial in-plane viscoelastic properties of the polymeric core of such sandwich structures. The spatial patterning is achieved using a recently developed UV irradiation selective technique of Room Temperature Vulcanization (RTV) silicone elastomeric membrane, in which the ultraviolet (UV) irradiation dose, curing time and temperature are the process parameters controlling the viscoelastic properties of the polymeric membrane. Finally, a protocol for the realization of architected aluminum -silicone -aluminum composite sandwich panels is proposed. The influence of UV irradiation selective technique is demonstrated by Dynamic Mechanical Analysis (DMA) measurements on the silicone core itself and by the Corrected Force Analysis Technique (CFAT) to measure the equivalent Young's modulus and damping of the sandwich structure over a large frequency band. As a first demonstration application, sandwich beams with different core patterns (homogeneous and heterogeneous) are designed and tested. Furthermore, the analytical formalism developed by Guyader et. al. is used to model the vibro-acoustic performances of the homogenous sandwich beams and fair model-experiments comparisons are obtained. The spatial patterning of the polymer layer is found to successfully affect the local properties of the composite heterogeneous beam as evidenced by the CFAT method. Finally, this work permits the enunciation of guidelines for designing complex architectured systems with further control of the vibro-acoustics performances.

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Section: Apparent Young's Modulus and Damping Of Homogeneous Three-lamentioning

confidence: 99%

Spatial Patterning of the Viscoelastic Core Layer of a Hybrid Sandwich Composite Material to Trigger Its Vibro-Acoustic Performances

Gallo¹,

Chesnais²,

Ege³

et al. 2018

SAE Technical Paper Series

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show abstract

“…However while the asymmetric mode of motion was correctly captured, the symmetric mode of motion was not naturally expressed using a Reissner-Mindlin's type of displacement field. The same authors presented an approach for taking into account for the symmetric wavw motion for thick panels in [19]. The WFEM was introduced in [20].…”

Section: Introductionmentioning

confidence: 99%

Computing the broadband vibroacoustic response of arbitrarily thick layered panels by a wave finite element approach

et al. 2014

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A robust procedure for the prediction of the dynamic response of layered panels within a SEA wave-context approach is proposed hereby. The dispersion characteristics of two dimensional composite orthotropic structures are predicted using a Wave Finite Element method. By manipulating the mass and stiffness matrices of the modelled structural segment a polynomial eigenvalue problem is formed, the solutions of which correspond to the propagation constants of the waves travelling within the structure. The wavenumbers and group velocities for waves comprising out of plane structural displacements can then be calculated. Using the numerically extracted wave propagation data the most important SEA quantities of the structure, namely the modal density and the radiation efficiency of each wave type are calculated. The vibroacoustic response of the structure under a broadband diffused excitation is then computed within a SEA approach. The impact of the symmetric and the antisymmetric vibrational motion of the panel on its sound transmission loss is exhibited and the approach proves robust enough for thin as well as for thick layered structures.

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“…But internal friction cannot be indefinitely increased, the main effect of polymer friction is the temperature and frequency, and each kind of viscoelastic damping material has its best working temperature and frequency range [3]. In recent years, the use of viscoelastic materials to improve the damping performance and the dynamic characteristics of components getting the people's attention, especially the thin-walled components, has been applied to aircraft engine, such as compressor blade, disc, and drum [4][5][6][7]. Now studies have shown that viscoelastic material with a high damping performance can effectively achieve damping vibration of structure and thus improve the component antivibration fatigue.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics of Blade with Viscoelastic Damping Block Based on Complex Eigenvalue Method

Wang

Zhang

et al. 2018

Shock and Vibration

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A novel method for vibration suppression is proposed, adding a viscoelastic damping block to the root of the blade. The dynamical equation for a rotational viscoelastic damping block-blade (VE-blade) in a centrifugal force field and aerodynamic force field is established to calculate the dynamical natural frequency and responses of the VE-blade. Complex modulus model is applied to represent the constitutive law of viscoelastic material and shear force acting on the VE-blade formulates the effect of viscoelastic damping at the root interfaces. The dynamical equation of the system is established and the Galerkin method is used to discretize the partial differential equations to a 3-DOF system so as to compute the dynamic natural frequencies and responses of the VE-blade. Then the differential equations of motion with 3-DOF are numerically solved by using complex eigenvalue method. A cantilever VE-blade is simplified according to testing the first three natural frequencies of the real blade to obtain geometric parameters of cantilever beam. The effects of various parameters including thickness, storage modulus, loss factor of viscoelastic damping block, and rotating speed on natural frequency and modal damping ratio of VE-blade are discussed in detail.

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Modeling thick composite laminate and sandwich structures with linear viscoelastic damping

Cited by 50 publications

References 18 publications

Spatial Patterning of the Viscoelastic Core Layer of a Hybrid Sandwich Composite Material to Trigger Its Vibro-Acoustic Performances

Spatial Patterning of the Viscoelastic Core Layer of a Hybrid Sandwich Composite Material to Trigger Its Vibro-Acoustic Performances

Computing the broadband vibroacoustic response of arbitrarily thick layered panels by a wave finite element approach

Dynamic Characteristics of Blade with Viscoelastic Damping Block Based on Complex Eigenvalue Method

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