A Study regarding the Technical-Economical Optimization of Structural Components for enhancing the Buckling Resistance in Stiffened Cylindrical Shells

Tanase, Maria; Zisopol, Dragos Gabriel; Portoaca, Alexandra Ileana

doi:10.48084/etasr.6135

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…The finite element model is a brick type, with 8 nodes and three degrees of freedom per node [17,23]. This model is a simplified one, based on the existence of two planes of symmetry [24][25]. The longitudinal dimension is an arbitrary one of 0.005 m.…”

Section: Analytical Calculus Of Fgds Usingmentioning

confidence: 99%

Radial Displacements in a Rotating Disc of Uniform Thickness Made of Functionally Graded Material

Nastasescu,

Toma

2024

Eng. Technol. Appl. Sci. Res.

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The finite element method is used to calculate a rotating disc, which has a uniform thickness and is made of functionally graded materials, based on the concepts of multilayer disc and equivalent material. These concepts are also available for analytical calculus. The multilayered disc concept perceives the disc as constructed from several layers, and the equivalent material concept regards the disc material as composed of homogeneous and isotropic material but with fictitious properties equivalent in behavior to the functionally graded material. These two concepts, encompassed in this study, allow us to contemplate the variation according to the material law and Poisson's ratio, which is often neglected, to reduce the mathematical complexity. The concepts, models, and methods involved in this study were validated by employing numerical and analytical calculations. The proposed method introduced simplicity, precision, and accessibility to solve the complex problem of functionally graded structures. The calculus development, model validation, and result analysis were based on numerical calculus using the finite element method. The utilized models were grounded on the existence of an axial-symmetric plane. So, 2D or 3D simplified models can be used with several variants regarding the mesh fineness. This study results and models are useful to specialists and structure designers of this type, have a high degree of generality, and present opportunities for the application of other calculation methods.

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Section: Analytical Calculus Of Fgds Usingmentioning

confidence: 99%

Radial Displacements in a Rotating Disc of Uniform Thickness Made of Functionally Graded Material

Nastasescu,

Toma

2024

Eng. Technol. Appl. Sci. Res.

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“…Thus, we processed a mandrel model to simulate the river stone, more precisely rounded at the end and with approximately the same dimensions as the defect, having an end in the form of a hemisphere with a radius of approximately 10 mm. The local printing by compression was carried out by this special mandrel made of hard aluminum (Figure 2), so that it had the necessary hardness to apply the forces in the order of 10 4 N [6]. For the experiment, we substituted the section of the pipe the defect was detected with L245 steel pipe segments, having Ø 60.3 mm diameter and 3.6 mm wall thickness, insulated with class B PEHD high-density polyethylene, with an applied thickness of 1.8 mm.…”

Section: Wwwetasrcom Filip Et Al: Damage To Natural Gas Distribution ...mentioning

confidence: 99%

Damage to Natural Gas Distribution Steel Pipelines caused by Rigid Bodies resulting from the Excavation of Laying Trenches

Filip,

Avrigean,

Pascu

2024

Eng. Technol. Appl. Sci. Res.

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The present paper focuses on analyzing the occurrence of defects such as dents and local deformations by laboratory simulations of a real case of a defect detected on a natural gas distribution pipeline lain at a depth of approximately 0.6 m. The defect is caused by a river stone which due to the compression forces, damages the pipe to the point of cracking. In the laboratory, the simulation was carried out on a steel pipe insulated with extruded polyethylene which was acted upon by a mandrel made of duralumin. The purpose of the tests is to determine the maximum values at which the pipe material fractures. It was found that the fracture of the pipes when there are rigid bodies in the protective layer of sand is accelerated by the sand existing between them and the pipe and by the change in the properties of the steel the pipes are made of when they are kept in water.

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Integrated Analytical, Numerical, and Statistical Analysis of Buckling Behavior in Steel Cylindrical Silos with Corrugated Walls

Tănase,

Portoacă,

Gabor

et al. 2024

Processes

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This paper investigates the buckling behavior of steel cylindrical silos with corrugated walls and vertical stringers under axial compression. The study integrates analytical, numerical, and statistical analyses to understand the influence of geometrical parameters such as radius, wall thickness, and corrugation profile on the buckling phenomenon. The analytical calculations elucidate the critical buckling load for various scenarios, considering both unstiffened and stiffened wall configurations. The finite element analysis provides numerical validation, while the statistical analysis offers insights into the sensitivity of the critical buckling load to different parameters. The results highlight the significance of corrugation height and suggest the optimal design parameters for maximizing buckling resistance while minimizing structural weight.

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A Study regarding the Technical-Economical Optimization of Structural Components for enhancing the Buckling Resistance in Stiffened Cylindrical Shells

Cited by 6 publications

References 15 publications

Radial Displacements in a Rotating Disc of Uniform Thickness Made of Functionally Graded Material

Radial Displacements in a Rotating Disc of Uniform Thickness Made of Functionally Graded Material

Damage to Natural Gas Distribution Steel Pipelines caused by Rigid Bodies resulting from the Excavation of Laying Trenches

Integrated Analytical, Numerical, and Statistical Analysis of Buckling Behavior in Steel Cylindrical Silos with Corrugated Walls

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