Damping properties analysis of composite sandwich doubly-curved shells

Zhai, Yanchun; Su, Jianmin; Liang, Shuquan

doi:10.1016/j.compositesb.2018.10.086

Cited by 21 publications

(12 citation statements)

References 33 publications

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“…Various approaches have been explored to analyse the vibration behaviours of these structures and predict the mode shapes and natural frequencies. [14][15][16][17][18][19][20][21][22] A spline finite strip method was developed to analyse the natural frequencies of rectangular sandwich plates; the results were in sound agreement with those of other studies. 15 It was found that the fundamental frequencies increase with an increase in the skew angles of the parallelogram sandwich plates.…”

Section: Introductionsupporting

confidence: 59%

Vibration behaviours of multi-debonded sandwich beams with symmetric angle-ply facesheets

Tsai

2023

Journal of Composite Materials

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Sandwich beams, comprising two stiff facesheets bonded to a core, are light and strong and see widespread application. However, debonded regions between the facesheets and the core can significantly reduce the strength and have an impact on the vibration behaviour. In this study, the previous literature was referred to, and finite element simulations were conducted using ANSYS on debonded sandwich beams with [0°]4, [+45°/−45°]S and [90°]4 carbon fibre reinforced polymer facesheets. The effects of the configurations of the three debonded regions and facesheet stacking orientations were studied. The most important finding is that if debonds cover vibration nodes, the natural frequencies drop more significantly because the stiffness decreases more. It was determined that when there were debonded regions, the natural frequencies of the bending modes of the beams using [0°]4 facesheets decreased more compared to those of the beams using [+45°/−45°]S and [90°]4 facesheets; while the trends are opposite for the natural frequencies of torsion modes of the beams using [+45°/−45°]S facesheets. Reducing the natural frequency can cause a structure to vibrate at the resonance frequency, leading to structural failure. This study contributes to furthering our understanding of how different debonds and facesheet stacking orientations affect the vibrations of sandwich beams.

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Section: Introductionsupporting

confidence: 59%

Vibration behaviours of multi-debonded sandwich beams with symmetric angle-ply facesheets

Tsai

2023

Journal of Composite Materials

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“…A refined firstorder shear deformation theory for layered composites and sandwich structure was proposed by Mantari and Ore. 17 The results showed that the proposed theory was more accurate and effective in solving the dynamic characteristics of single-layer and sandwich composite plates than the existing first-order shear deformation theory. Zhai et al [18][19][20] derived the vibration differential equation of composite viscoelastic sandwich plates and shells by shear deformation principle and variational method, and discussed the influence of material structure and properties on their vibration characteristics. Li et al [21][22][23] established the theoretical equation of composite sandwich cylindrical shell and explored its nonlinear dynamic characteristics.…”

Section: Introductionmentioning

confidence: 99%

Free vibration of co‐curing damping sandwich composites with different lay‐up angles

Zheng,

Zhou,

et al. 2023

Polymer Composites

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In this article, the dynamic characteristics of Co‐curing Damping Sandwich Composites with Different Lay‐up Angles (CDSCDLA) are studied by means of modal analysis and numerical simulation to optimize the structure of co‐curing composites. The vibration equilibrium equation of CDSCDLA is derived according to first order shear deformation theory and Hamilton equation. The dynamic model of the structure is established by finite element simulation to verify the accuracy of the theoretical calculation. The influence of different lay‐up angle and the damping film thickness on the free vibration of CDSCDLA is explored under the condition of constant skin thickness. The theoretical derivation and finite element simulation results reveals that the overall dynamic characteristic of damping sandwich composite with a lay‐up angle of 45° is optimal when the damping film thickness is constant. In particular, when the thickness of the damping film is 0.1 mm, the first‐order mode damping and mode frequency of composite plate with a lay‐up angle of 45° reach the maximum value of 0.1495 and 747.9 Hz, respectively. The first order damping loss factor of the CDSCDLA with different layup angles is maximum when the damping film thickness is 0.3 mm. However, blindly increasing the damping layer thickness can not always improve the damping performance of the composite structure, but will greatly reduce the stiffness of the composite. The work provides a reference for dynamic performance optimization and structural design of sandwich plate with high strength and large damping loss factor.Highlights Free vibration of sandwich composites with lay‐up angles is investigated. The dynamic analytical model of the structure is established. The validity of the derived theory is verified by numerical simulation.

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“…With its excellent damping effect, CLD has been widely used in applications related to marines, vehicles and aerospace industries, but there is still a lack of its investigation and application in rail transit bridge engineering. 17 Analytical methods are developed to investigate the dynamic performance of simple beams, plates and cylindrical shells damped with viscoelastic layer, [18][19][20][21][22][23] but due to the complexity of geometric configuration and boundary conditions of steel bridges, it will be an arduous task. The finite element (FE) modeling is a good approach, which has been widely applied to analyze the vibrational behavior of structures with viscoelastic layer.…”

Section: Introductionmentioning

confidence: 99%

A combined iterative complex eigenvalue method and finite element-boundary element method for acoustic analysis of the railway steel bridge deck damped with constrained layer damping

Jiang,

Li,

et al. 2023

Jnl of Sandwich Structures & Materials

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This paper presents a combined method to predict structure-borne noise from the railway steel bridge deck damped with constrained layer damping (CLD), in which the frequency-dependent properties of the viscoelastic material are accurately considered through the iterative complex eigenvalue method (ICEM). Then, a 1:4 steel bridge deck model is designed and manufactured, and a series of hammer tests of the CLD-damped steel bridge deck are carried out in a semi-anechoic chamber to verify the proposed method. Then, the noise reduction effect of CLD is discussed in detail. It shows that the overall SPLs at the near field point S-3 and the far field point S-8 are reduced by 7.5 dB and 11.1 dB, respectively, and the noise attenuation rate along with distance is also improved significantly after damped with CLD. Finally, the influences of the key design parameters of CLD on noise reduction are quantitatively analyzed, so as to provide reference for the research and application of CLD in railway bridge engineering.

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Damping properties analysis of composite sandwich doubly-curved shells

Cited by 21 publications

References 33 publications

Vibration behaviours of multi-debonded sandwich beams with symmetric angle-ply facesheets

Vibration behaviours of multi-debonded sandwich beams with symmetric angle-ply facesheets

Free vibration of co‐curing damping sandwich composites with different lay‐up angles

A combined iterative complex eigenvalue method and finite element-boundary element method for acoustic analysis of the railway steel bridge deck damped with constrained layer damping

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