Experimental evaluation of the vibration behavior of flat and curved sandwich composite beams with face/core debond

“…Okutan et al [11] studied the vibration behavior of flat and curved sandwich with different position of debonding. The authors showed that the debonding causes the decrease of frequency and the curvature angle of sandwich is sensible at the frequency response.…”

Section: Introductionmentioning

confidence: 99%

Characterization of sandwich beams with debonding by linear and nonlinear vibration method

Idriss

Mahi

Guerjouma

2015

Composite Structures

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“…Okutan et al 17 studied the influence of position of debonding on the dynamic behavior of flat and curved sandwich. They showed that the frequency decreases with the presence of debonding.…”

Section: Introductionmentioning

confidence: 99%

Characterization of sandwich beams with shear damages by linear and nonlinear vibration methods

Ammar

Mahi

Karra

et al. 2017

Journal of Composite Materials

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The aim of the present work is to study the vibration behavior of sandwich composites with shear damages on the foams. The effect of the densities of damage on the linear and nonlinear vibration parameters is studied. The sandwich materials used in this study is constructed with glass fiber laminates as skins and with PVC closed-cell foams with density 60 and 100 kg m À3 as core. After a serie of vibration tests, the change of natural frequencies and modal damping due to the damage and the foam densities. For an intact specimen, the resonance frequency was constant when we increase the excitation amplitude. For damaged specimens, the resonance frequencies decrease and the loss factors increase proportionally with the increasing excitation amplitude. The nonlinear parameters corresponding to the elastic modulus and damping were determined for each frequency modes and each damage and foam densities. The results showed that nonlinear dissipative parameters were more sensitive to damage than linear elastic and dissipative parameters.

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“…Matsunaga [8,9] used 1D high-order theory to solve the natural frequencies and buckling loads of composite curved beams subjected to axial concentrated force considering the shear deformation and moment of inertia. Baba and Thoppul [10] explored the flexural strength and vibration characteristics of sandwich laminated curved beams determined the effects of laminated debonding and curvature on their natural frequencies. Yildirim [11] derived the differential equations of motion of spatial curved bars of anisotropic materials, but the examples in this research remain straight beams.…”

Section: Introductionmentioning

confidence: 99%

“…The abovementioned studies [1][2][3][4][5][6][7][8][9][10][11] included one or several items of the anisotropy of the rod material, the curvature and torsion of the rod axis, the effects of rotary inertia, and the shear and axial deformations. The effect of the warping deformation of the cross section on natural frequencies is disregarded.…”

Section: Introductionmentioning

confidence: 99%

Differential Equations of Motion for Naturally Curved and Twisted Composite Space Beams

Hao

Shi

2018

Shock and Vibration

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The differential equations of motion for naturally curved and twisted elastic space beams made of anisotropic materials with noncircular cross sections, being a coupled system consisting of 14 second-order partial differential equations with variable coefficients, are derived theoretically. The warping deformation of beam's cross section, as a new design factor, is incorporated into the differential equations in addition to the anisotropy of material, the curvatures of the rod axis, the initial twist of the cross section, the rotary inertia, and the shear and axial deformations. Numerical examples show that the effect of warping deformation on the natural frequencies of the beam is significant under certain geometric and boundary conditions. This study focuses on improving and consummating the traditional theories to build a general curve beam theory, thereby providing new scientific research reference and design principle for curve beam designers.

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Experimental evaluation of the vibration behavior of flat and curved sandwich composite beams with face/core debond

Cited by 31 publications

References 14 publications

Characterization of sandwich beams with debonding by linear and nonlinear vibration method

Characterization of sandwich beams with debonding by linear and nonlinear vibration method

Characterization of sandwich beams with shear damages by linear and nonlinear vibration methods

Differential Equations of Motion for Naturally Curved and Twisted Composite Space Beams

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