Dynamic Analysis Of Composite Sandwich Beams Under Moving Mass (original) (raw)
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Finite Element Vibration Analysis of Damped Composite Sandwich Beams
The International Journal of Acoustics and Vibration
In this study, a finite element model for the vibration analysis of cross-ply laminated sandwich beams is presented. This formulation is an extension of our previous work on predicting the acoustic and vibration responses of sandwich beams and plates with homogeneous elastic faces and a viscoelastic core. The formulation is based on a layerwise linear axial displacement through the beam thickness. The formulation assumes the classical lamination theory for the faces and Timoshenko theory for the core. The governing equations of motion are obtained using Hamilton's principle. A finite element method and a beam element are further developed to predict the natural frequencies and modal loss factors. In order to validate the proposed model, several free vibration analyses of composite sandwich beams with different boundary conditions, length-to-thickness ratios and face laminations are presented. The results are then compared with solutions available in the literature and with those obtained by the PATRAN/NASTRAN finite element software package. These results show the validity of the present formulation. Finally, the effects of ply-stacking sequence, core-to-face stiffness ratio and core-to-face thickness ratio upon the natural frequencies and modal damping are investigated.
Mechanics of Composite Materials, 2021
A dynamic analysis of the behavior of sandwich beams with a viscoelastic core under the action of a moving load is performed considering their geometrical asymmetry. The use of viscoelastic materials integrated into structures in front of the moving load is considered as a new suggestion to enhance their stability. A high-order theory, taking into consideration longitudinal and rotational inertias was used to examine the viscoelastic damping properties composite sandwich beams with account of their geometrical asymmetry and the frequencydependent behavior of their viscoelastic core.
This paper series presents an analysis regarding the dynamics of sandwich composite beams, embedded at one end, in order to highlight the effect of geometrical and material discontinuities upon the natural frequencies. In first part (Part I), analysis was performed with Euler-Bernoulli analytical method for determining the vibration modes and in second part (Part II), analysis was performed with numerical simulation in SolidWorks software for a five-layer composite. In the last section of the paper, an example is shown regarding how to interpret the obtained results.
Prediction of the dynamic response of composite sandwich beams under shock loading
International Journal of Impact …, 2010
Finite element calculations are reported for the dynamic shock response of fully clamped monolithic and sandwich beams, with elastic face sheets and a compressible elastic-plastic core. Predictions of the peak mid-span deflection and deflected shape of the beam are compared with the previously reported measured response of end-clamped sandwich beams, made from face sheets of glass fibre reinforced vinyl ester and a core of PVC foam or balsa wood (Tagarielli V.L., Deshpande V.S. and Fleck N.A.. The dynamic response of composite sandwich beams to transverse impact, Int. J. of Solids and Structures, 44, 2007) [1]
Parametric study on the damping of sandwich composite beams
The damping property of sandwich structures is vital for the structural design since it influences the noise and vibration behavior. In this paper, the damping properties of the sandwich structures are computed using the strain energy method. The influences of the fiber orientation for the facing, the shear stiffness and thickness of the core are studied. Three groups of sandwich composite beams are produced and their damping properties are measured. The three groups include the different core thickness, different fiber orientation and different core properties. Through the experimental validation, the strain energy method proved to be able to accurately predict the loss factors of sandwich beams. In addition, it is found that increasing core thickness increases the loss factor; the loss factor has a maximum value when fiber orientation is 45 or 30; the lower shear stiffness of the core is beneficial for the damping of sandwich structures.
Dynamic Response of a Three-Layered Sandwich Beam Under Oscillatory Moving Sprung Mass
2017
Today, the use of new materials with a high strength-to-weight ratio, such as composite materials and sandwich materials is increasing in the transportation industry. This issue is most commonly used in special bridges to passing vehicles and trains. Therefore, the dynamic response analysis of the structure under moving loading is of great importance. Hence, a lot of research has been carried out on this field that helps in solving such problems. The purpose of this research is to analyze the dynamic response of a sandwich beam under oscillatory moving sprung mass. The purpose of this research is to analyze the dynamic response of a sandwich beam under oscillatory moving sprung mass. Many parameters are involved in the dynamic response of the sandwich beam, which can be noted as follows. 1. The mass ratio of the moving sprung mass to the sandwich beam mass, 2. The ratio of the sprung spring stiffness to the sandwich beam bending stiffness and 3. The ratio of the vibrational frequenc...
Dynamic analysis of sandwich beam with viscoelastic core under moving loads
Mechanics
In this article, numerical approach is proposedfor dynamic behavior of symmetrical sandwich beams with viscoelastic core under movingload using the Hamilton's principle formulation and the finite element method solution. The dynamic responses are obtained for different configurations using the modal superposition method and the implicit Newmark integration scheme. The analysis shows that the viscoelastic damping has a significant effect on the vibration behavior involving the improvement of the damping of the structure. The parametric study of the effect of the configuration parameters shows that the sandwich structure has more dissipative capacities of vibratory energy by adopting adequate configurations to the structure.
Analytical study of the low-velocity impact response of composite sandwich beams
Composite Structures, 2014
In this work the low-velocity impact response of composite sandwich beams was studied by an analytical model. A dimensional analysis was carried out in order to identify the key parameters that influence the dynamic beam response, and to assess the effect of the dimensionless groups on the contact force and contact time. Low-velocity impact tests were conducted to validate the theoretical model. The predicted results were in good agreement with experimental data in terms of maximum contact force, contact time, and contact force-time curves. It was shown that the groups with more influence on maximum contact force and contact time are the dimensionless global stiffness, the dimensionless local stiffness, and the dimensionless impact velocity.
2015
The present paper deals with the analysis of displacement field forms effects on natural frequencies for flexure problems of laminated sandwich beams. Several forms using various parameters are tested. Both analytical and finite elements formulations using Hamilton's principle are carried out. Numerical results have been computed of a sandwich beam and compared in order to highlight the importance of inclusion of such parameters and its capacity for good estimation of natural frequencies of sandwich beams.
2021
This paper presents an approach to the analysis of free and forced vibrations of strengthened sandwich beam with viscoelastic core and composite coats by considering geometrical asymmetry. A higher-orde theory is used considering longitudinal and rotational inertias as well as the asymmetry of sandwich beam. The formulation of the equation of motion is carried out by Hamilton principle. A comparative study to validate the proposed numerical approach is performed comparing the obtained results with other findings. Moreover, a parametric analysis is carried out with different configurations of the sandwich beams in order to analyze the influence of different parameters on the dynamic behavior. The analysis highlighted from the study of fiber orientation influence on dynamic behavior, that the structure damping can be improved by adopting a better composite configuration. However, the obtained results from the thickness ratio effect showed that the sandwich structure has more dissipati...