Free vibration analysis of variable stiffness laminated composite beams

Kheladi, Z.; Hamza-Cherif, S. M.; Ghernaout, M. E. A.

doi:10.1080/15376494.2020.1712750

Cited by 27 publications

(4 citation statements)

References 58 publications

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“…The value of GFRP Composite Natural Frequency is 174.1 Hz, then there is a decrease in the percentage of natural frequency equivalent to 24% for H1, 12% for H2, then the natural frequency of hybrid composite materials has increased by 23% for H3, 74 % for H4, then hybrid composite H5 again experienced a natural frequency decrease of 24%. The natural frequency of the composite material and the material's stiffness are directly correlated [9]. This shows that the addition of ramie fiber composition by 20% to 40% increases the stiffness of the hybrid composite material.…”

Section: Dynamic Mechanical Propertiesmentioning

confidence: 79%

Effect of Hybridization of Ramie Fibers on the Vibrational and Damping Responses of Ramie/Glass/Epoxy Resin Composite Laminates

Ikbal,

Rizal,

Ali

et al. 2023

KEM

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Fiber reinforced polymer composites made with glass fibers are among the oldest and most popular kinds of composites in use today. Glass fiber reinforced composites' key benefits are their adaptability for specific material applications, which allows them to give a number of design advantages relating to strength, chemical stability, impact damage tolerance, heat insulation, and low cost. The focus of this research is to investigate the role of hybridized ramie fibers in the assessment of enhanced vibrational damping capabilities in fiber glass reinforced composites, as well as in the initial assessment to verify their acceptability for real-time applications. Composite molding employing the hand layup technique was used to fabricate hybrid epoxy composites with ramie to glass fiber weight ratios from 0 to 50%. A free vibration test was performed to determine the hybrid composite's vibration dampening capabilities as a function of the ramie fiber filler content. The results demonstrated that the damping ratio was reduced when the percentage of ramie fiber in the GFRP composite was raised from 10% weight to about 50% weight. But adding up to 40% wt of ramie fiber to the hybrid composite had the biggest effect on the damping ratio, natural frequency, storage modulus, and loss modulus. This means that using ramie fiber in hybrid composites will be cost-effective and good for the environment.

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Section: Dynamic Mechanical Propertiesmentioning

confidence: 79%

Effect of Hybridization of Ramie Fibers on the Vibrational and Damping Responses of Ramie/Glass/Epoxy Resin Composite Laminates

Ikbal,

Rizal,

Ali

et al. 2023

KEM

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“…29 using higher-order structural theory; it was concluded the increase in temperature and moisture concentrations decreased the natural frequency of the shell. Kheladi et al 30 proposed the vibrational analysis of VSCL beams made of parabolic curvilinear fibres by an equivalent single layer theory and isogeometric analysis. Yan et al 5 made the vibration study of VSCL beams with the presence of spatially varying fibres orientation using hierarchical differential quadrature method-DQM coupled with the quasi-three-dimensional formulation.…”

Section: Introductionmentioning

confidence: 99%

Post-buckling of variable stiffness curvilinear fibre-reinforced general lay-up composite beams by sinusoidal shear flexible theory

Ganapathi

Polit

Haboussi

et al. 2023

Journal of Reinforced Plastics and Composites

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The mechanical post-buckling behaviour of variable stiffness layered composite beams reinforced by curvilinear fibres subjected to compressive loads is investigated here using a sine function-based shear flexible beam model. The neutral axis stretching force stemming from the axial movement restraints is accounted for through von Karman’s assumption based geometrical nonlinearity. Furthermore, the modified beam constitutive equation arising from the consideration of the Poisson’s effect is introduced in the formulation for the laminated beam analysis with general lay-up or ply sequences. The governing equations incorporating the incremental stiffness matrices are formed through the minimization of total potential energy principle and are solved by numerical method. The solutions for the developed governing equations are evaluated iteratively based on eigenvalue analysis and the characteristics of post-buckling of laminated beams can be inferred through the relationship between the beam deflection level and post-buckling axial load. An in-depth analysis selecting many design parameters for instance lamina’s curvilinear fibre angles, beam slenderness ratio, lay-up and edge conditions, load type and so on is dealt with in bringing out the behaviour of variable stiffness laminated beam in linear and post-buckling regions. Also, the influence of flexible end supports by restraining elastically against ends rotation is studied on the beam elastic stability behaviour.

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“…Over the years, researchers have conducted numerous investigations to examine the static and dynamic response of composite beams, arches and plates. 1–23 However, there is a need to eliminate the delamination problem that may occur in the layers of laminated composite materials due to the mechanical stresses or thermal effects, or to reduce the stress concentrations that occur due to sudden property changes at the material interfaces. 24–26 On the other hand, functionally graded materials (FGMs), firstly used as a coating material for a rocket body, 27 provide a properly graded interface and this design helps to reduce incompatibilities between two different materials.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear buckling and post-buckling analyses of functionally graded circular shallow arches

Atacan,

Yükseler

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Snap-through analysis of thin, functionally graded (FG), fixed, circular shallow arches subjected to uniformly distributed vertical load is examined in this paper. The modulus of elasticity varies gradually along with the normal to the axis of the arch in alliance with the power law form. The solution of the geometrically nonlinear problem is carried out by using a numerical scheme accounting for the moderately large deflections theory based on small strain and moderate rotation in the von Kármán sense. The combined effect of the parameters that is, the power law index, the ratio of the modulus of elasticity and the modified slenderness ratio on the support reactions, the snap-buckling and post-buckling behaviors of the fixed circular shallow arches are examined. It is found that the lowest buckling load is considerably affected by the variation of these parameters. In addition, the effects of the material distribution on internal forces, deformed configurations and rotation angle are presented at various stages of the deformation.

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Free vibration analysis of variable stiffness laminated composite beams

Cited by 27 publications

References 58 publications

Effect of Hybridization of Ramie Fibers on the Vibrational and Damping Responses of Ramie/Glass/Epoxy Resin Composite Laminates

Effect of Hybridization of Ramie Fibers on the Vibrational and Damping Responses of Ramie/Glass/Epoxy Resin Composite Laminates

Post-buckling of variable stiffness curvilinear fibre-reinforced general lay-up composite beams by sinusoidal shear flexible theory

Nonlinear buckling and post-buckling analyses of functionally graded circular shallow arches

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