Analytical Solutions for Transversely Isotropic Fiber-Reinforced Composite Cylinders under Internal or External Pressure

Farukoğlu, Ömer Can; Korkut, İ̇hsan

doi:10.2339/politeknik.784812

Cited by 2 publications

(3 citation statements)

References 22 publications

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“…The determining aeroelastic equation of motion in vibration in non-damping vacuum mode of an elastic structural system with small displacements can be expressed as: (10) Where [M], [K], and [Ka] are the global mass, stiffness, and aerodynamics matrices respectively. These matrices are obtained by assembling an element matrix for the entire structural system.…”

Section: 1flutter Equation Of Panelmentioning

confidence: 99%

“…Hassan et al [9] studied the aeroelastic behavior (flutter analysis) of carbon nanotube(CNTs) reinforced polymeric cone shells under supersonic fluid flow using FSDT and the differential quadrature method with linear piston theory. Long, thick-walled composite cylinders with internally or externally pressurized fixed ends have been investigated [10]. The free vibrational behaviour of axially compressed cross-laminated composite cylinders has been studied using FSDT-based shell FEs with various boundary conditions [11].…”

Section: Introductionmentioning

confidence: 99%

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Panel Flutter Numerical Study of Thin Isotropic Flat Plates and Curved Plates with Various Edge Boundary Conditions

Pany

2023

Politeknik Dergisi

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In this article, supersonic panel flutter analysis of flat plates and curved plates with different edge boundary conditions are studied, using efficient, high precision triangular shallow shell finite elements. The fluid on the underside of the plate was is assumed to be stationary. The linear piston theory can be applied to the top surface of the plate. The linear piston theory was used to evaluate the aerodynamic loads. The solution of a complex eigenvalue problem was formulated according to Hamilton’s principle. Lagrange’s equation of motion was obtained using standard methods for finding eigenvalues. Current finite element analysis ignores aerodynamic damping. For panels, the theory of thin and small deformed shells was taken into account. To validate the developed finite element code, the results of a square and rectangular flat-panels with simply supported edges (S-S-S-S), a square plate with four fixed edges (C-C-C-C), and a square plate with the length side clamps (C-S-C-S) were compared with the published data. The flutter results of other edge boundary conditions (S-C-S-C, C-S-C-S, and C-C-C-C) for square and rectangular flat panels are evaluated for which literature data is limited. It has been found that the fixed condition in the cross-flow direction (S-C-S-C) has a significant effect on the critical flutter pressure parameters and flutter frequencies. Further, to study the aforementioned effect, the current finite element (FE) has been extended to curved plates with S-C-S-C(constrained in the cross-flow direction and exposed to supersonic flow), SS-S-S boundary conditions to find flutter results.

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Section: 1flutter Equation Of Panelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Panel Flutter Numerical Study of Thin Isotropic Flat Plates and Curved Plates with Various Edge Boundary Conditions

Pany

2023

Politeknik Dergisi

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“…Not only high weight but also permissive speeds and vibration damping are the shortcomings of steel shafts [17]. The utilization of composite materials can exhibit improved properties with reduced weight [17][18][19][20][21][22][23][24]. Especially, carbon fiber reinforced epoxy composite is a preferred alternative for this purpose [25][26][27], because it's specific stiffness is more than four times of steel [14].…”

Section: Introductionmentioning

confidence: 99%

Determination of Design Criteria for Composite Drive Shaft in Automobiles

2024

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Thanks to their superior properties such as light weight, higher strength and stiffness, corrosion resistance, the use of plastic matrix composites become attractive in many applications. The weight reduction in the automotive sector is one of these applications. By use of plastic matrix composites, weight and CO2 emission reduction in automobiles could be achieved easily. In this study, carbon fiber and epoxy matrix were processed via filament winding method to produce composite drive shaft. Prior to production, finite element modeling were performed to determine the safest design parameters. Various winding angles were analyzed under torsional loading and number of layer was determined according to the failure index and strength ratio criteria. As a result of the numerical analysis, it was seen that the design with the minimum cost in terms of strength was the 10-layer model with a winding angle of +/- 45 degrees. To validate the design, the composite shaft was produced with the determined configurations and tested. The fiber volume fraction and the void content of the produced composite were found as ~46% was ~0.28%, respectively. No plastic deformation was observed in the torsion test. In the flattening and drift-expansion tests, plastic deformation occurred at 39 kN and 106.5 kN, respectively. Compared with a steel shaft, the obtained composite shaft has an 80% reduction in weight, and this could lead to a 1% fuel saving in passenger vehicles.

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Analytical Solutions for Transversely Isotropic Fiber-Reinforced Composite Cylinders under Internal or External Pressure

Abstract: Highlights  As fiber volume fraction increases, yielding begins at higher strength  Radial fiber direction gives better results in terms of yielding than axial direction  Plastic flow takes place at inner radii of the cylinders

Cited by 2 publications

References 22 publications

Panel Flutter Numerical Study of Thin Isotropic Flat Plates and Curved Plates with Various Edge Boundary Conditions

Panel Flutter Numerical Study of Thin Isotropic Flat Plates and Curved Plates with Various Edge Boundary Conditions

Determination of Design Criteria for Composite Drive Shaft in Automobiles

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