Characterisation of viscoelastic layers in sandwich panels via an inverse technique

Barkanov, E.; Skuķis, Eduards; Petitjean, B.

doi:10.1016/j.jsv.2009.07.011

Cited by 44 publications

(28 citation statements)

References 13 publications

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“…Compared to the work of Pagnacco et al [26] and to that of Matter et al [27,36], the present method does not require full-field measurements and is thus much simpler to implement and faster to execute. Compared to the method of [29,37,66], High Resolution Modal Analysis allows for more modal data to be extracted and used for the estimation of the elastic and damping properties of sandwich materials. Moreover, residuals obtained in the present paper for modal frequencies (≃ 1 %) and dampings (≃ 10 %) are fully in agreement with residuals obtained in [36][37][38] which estimate mechanical parameters of sandwich panels using much less modal data than does the present study.…”

Section: Resultsmentioning

confidence: 99%

“…A few studies have been devoted in the last years to the problem of estimating their damping properties in beams [31,32], in plates by means of sophisticated full-field measurements [35,36], and quite recently in plates by single point measurements [37,38]. Since none of these studies present a sensitivity analysis, the validity of the model they used for damping is difficult to assess.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of relevant elastic and damping material properties in sandwich thick plates

Rébillat

Boutillon

2011

Journal of Sound and Vibration

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An easy-to-implement method to measure relevant elastic and damping properties of the constituents of a sandwich structure, possibly with a heterogeneous core, is proposed. The method makes use of a one-point dynamical measurement on a thick plate. The hysteretic model for each (possibly orthotropic) constituent is written generically as "E(1 + jη)" for all mechanical parameters. The estimation method of the parameters relies on a mixed experimental / numerical procedure. The frequencies and dampings of the natural modes of the plate are obtained from experimental impulse responses by means of a high-resolution modal analysis technique. This allows for considerably more experimental data to be used. Numerical modes (frequencies, dampings, and modal shapes) are computed by means of an extended Rayleigh-Ritz procedure under the "light damping" hypothesis, for given values of the mechanical parameters. Minimising the differences between the modal characteristics yields an estimation of the values of the mechanical parameters describing the hysteretic behaviour. A sensitivity analysis assess the reliability of the method for each parameter. Validations of the method are proposed by (a) applying it to virtual plates on which a finite-element model replaces the experimental modal analysis, (b) some comparisons with results obtained by static mechanical measurements, and (c) by comparing the results on different plates made of the same sandwich material.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurement of relevant elastic and damping material properties in sandwich thick plates

Rébillat

Boutillon

2011

Journal of Sound and Vibration

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“…The displacement field method was developed by Cherif et al [19] to estimate the loss factor of two-dimensional orthotropic structures based on a scanning laser vibrometer measurement. The inverse identification approach was implemented by Barkanov et al [20] to characterize the viscoelastic layers in sandwich panels and was used by Sun et al [21] to evaluate the mechanical parameters of viscoelastic materials.…”

Section: Introductionmentioning

confidence: 99%

Study on the Dynamic Mechanical Properties of Viscoelastic Materials Based on Asymmetrical Sandwich Beams

Qing-qing¹,

Wang²

2018

Applied Sciences

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A modified estimation method for the dynamic mechanical properties of viscoelastic materials via asymmetrical sandwich specimens is presented. In contrast to the traditional vibrating cantilever beam test method (VCBTM), the proposed method allows asymmetrical base beams in sandwich specimens. Based on the complex stiffness method, complex parameters are introduced for general sandwich configurations. Calculation formulas for loss factor and shear modulus of the core material are presented. The effectiveness of this approach is validated numerically and experimentally by analysis of one symmetrical sandwich beam specimen and two specimens with asymmetrical thicknesses and materials. It is shown that dynamic mechanical parameters of the core material can be obtained regardless of sandwiches' symmetry. The proposed method breaks the symmetrical criteria for sandwich specimens and may provide a wider application to measure viscoelastic materials' dynamic properties.

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“…This method associates homotopy and asymptotic numerical techniques and it was applied to the calculation of the natural frequencies and the loss factors of viscoelastically damped sandwich structures. Barkanov et al [5] developed an inverse technique to characterize the nonlinear mechanical properties of viscoelastic core layers in sandwich panels. This technique was based in vibration tests, allowing preserving the frequency and temperature dependences of the storage and loss moduli of viscoelastic materials.…”

Section: Introductionmentioning

confidence: 99%

“…The reason why these theories were chosen is related to its less computational cost when compared to other higher order theories without loss of performance quality. As the inner layer of these structures is considered to behave in a viscoelastic way, the corresponding elastic properties are modelled using the complex method as some researchers [4,5,8] have also considered. The resulting dynamic problem is then solved in the frequency domain.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of Soft Core Sandwich Beams with Metal-Graphene Nanocomposite Skins

Loja

2017

Shock and Vibration

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Sandwich structures are able to provide enhanced strength, stiffness, and lightweight characteristics, thus contributing to an improved overall structural response. To this sandwich configuration one may associate through-thickness graded core material properties and homogeneous or graded properties nanocomposite skins. These tailor-made possibilities may provide alternative design solutions to specific problem requisites. This work aims to address these possibilities, considering to this purpose a package of three beam layerwise models based on different shear deformation theories, implemented through Kriging-based finite elements. The viscoelastic behaviour of the sandwich core is modelled using the complex method and the dynamic problem is solved in the frequency domain. A set of case studies illustrates the performance of the models.

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Characterisation of viscoelastic layers in sandwich panels via an inverse technique

Cited by 44 publications

References 13 publications

Measurement of relevant elastic and damping material properties in sandwich thick plates

Measurement of relevant elastic and damping material properties in sandwich thick plates

Study on the Dynamic Mechanical Properties of Viscoelastic Materials Based on Asymmetrical Sandwich Beams

Dynamic Response of Soft Core Sandwich Beams with Metal-Graphene Nanocomposite Skins

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