The Effect of Viscoelastic Adhesive Layers on Structural Damping of Sandwich Beams*

Bai, Jiaming; Sun, C. T.

doi:10.1080/08905459508905225

Cited by 37 publications

(17 citation statements)

References 10 publications

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“…For the thick soft viscoelastic damping cores, transverse compressional damping was an important factor. Bai and Sun (1995) studied the effects of a viscoelastic adhesive layer on the dynamic response and structural damping of sandwich structures. A newly developed high-order displacement field was used in order to achieve more accurate kinematics of the flexible viscoelastic core.…”

mentioning

confidence: 99%

<title>Frequency response of beams with passively constrained damping layers and piezoactuators</title>

Wang

Wereley

1998

SPIE Proceedings

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We present and review methods of frequency response analysis for cantilevered sandwich beams consisting of aluminum face plates and passively constrained damping layers at the mid-plane. These analysis methods include: (1) progressive wave method, (2) assumed modes method, and (3) finite element method. The progressive wave method accounts for the frequency dependent complex modulus in analyzing the frequency response function. In the assumed mode and FEM analyses, the frequency dependent complex modulus is assumed to be a constant over the frequency range of interest (i.e. the first three modes). By selecting the value of complex modulus to nominally correspond to the second modal frequency, the error in predicted natural frequency can be minimized. However, this comes at the cost of increased error in the damping ratio predictions, which are minimized by selecting the value of complex modulus corresponding to the first mode.

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confidence: 99%

<title>Frequency response of beams with passively constrained damping layers and piezoactuators</title>

Wang

Wereley

1998

SPIE Proceedings

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“…In thinlayer beam theory approaches, mainly known as sandwich construction in the form of thin face panels, the analytical model and solution to estimate the effective mechanical properties of adhesives are unavoidable. eoretical studies about the bending capacity subjected to various working loads have been given, and the research on nonrigid adhesive applied the plate theory developed by Hussein [1,2,9,39,40]. In fact, the approaches were initiated by the Kirchhoff-Love plate theory.…”

Section: Analytical Modelsmentioning

confidence: 99%

Numerical Analysis for U‐Shaped Thin‐Walled Structure Reinforced Timber Beam Based on Thin‐Layer Beam Theory

Liu¹,

Li³

et al. 2019

Advances in Civil Engineering

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This paper presents a theoretical model, taking into account the shear deformation subjected to the influence of U-shaped member by geometric parameters as flange height based on thin-layer beam theory, to analyze the structural bending behavior of U-shaped member reinforced timber composite beams, and the feasible design forms of U-section have been pointed out. The algorithm for this composite beam is the most practical and effective method to meet the accurate solution. The formulas for the common forms of U-section are presented. It aims to develop a rational engineering approach. The proposed model has been validated by comparing the results obtained in the present analysis with experimental results and finite element analysis. Furthermore, the results suggested that the value of flange height can be one-fifth the beam height based on the present analysis by comparison of two types of beams. And it is shown that the model provided here correlates consistently and satisfactorily with a wide range of timber beams reinforced by a thin-walled structure such as steel or aluminum alloy sheet bonded to their tension faces.

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“…Rao and Nakra [81 included the inertia effects of transverse, longitudinal and rotary motion. Bai and Sun [9] eliminated the perfect interface and constant transverse deformation assumptions. Rao and Nakra [15] developed the basic equations of vibratory bending of asymmetric sandwich plates with isotropic face-plates and viscoelastic core.…”

Section: Introductionmentioning

confidence: 99%

<title>Modeling and experimental validation of a sandwich plate with isotropic face plates and viscoelestic core</title>

Veermani

Wereley

1997

Smart Structures and Materials 1997: Passive Damping and Isolation

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We analyze and experimentally validate an analysis of a sandwich plate structure, where anisotropic face plates sandwich a viscoelastic core. Existing analytical models have been modified to incorporate piezo-actuation in anisotropic and 3-layered thin plates, using the variational energy method. The 3-layered sandwich consists of anisotropic face-plates with surface bonded piezo-electric actuators, and a viscoelastic core. The analysis includes the membrane and transverse energies in the face plates, and shear in the viscoelastic core. A constant, complex shear modulus was used for the dissipative core, thus frequency and temperature dependence of viscoelastic propoerties is neglected in this model. Simplified forms of the equations are stated based on neglecting shear in face-plates. Experiments were conducted on sandwich plates with aluminum face-plates under clamped boundary conditions to validate the simplified model. Symmetric and asymmetric sandwiches were tested. The maximum error in the first eight natural frequency predictions obtained via the assumed modes solution is less than <10%. Analytical studies on the influence of the number of assumed modes in the Galerkin approximation, and the core storage modulus variation, were conducted. The importance of the in-plane extension modes in sandwich plate analysis was demonstrated. Error in the first natural frequency is nearly 100% when in-plane modes are ignored; error reduces and converges to 6.7% as number of modes is increased to 16 in each of the in-plane directions for each face plate.

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The Effect of Viscoelastic Adhesive Layers on Structural Damping of Sandwich Beams*

Cited by 37 publications

References 10 publications

<title>Frequency response of beams with passively constrained damping layers and piezoactuators</title>

<title>Frequency response of beams with passively constrained damping layers and piezoactuators</title>

Numerical Analysis for U‐Shaped Thin‐Walled Structure Reinforced Timber Beam Based on Thin‐Layer Beam Theory

<title>Modeling and experimental validation of a sandwich plate with isotropic face plates and viscoelestic core</title>

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