Optimization of cylindrical shells stiffened by rings under external pressure including their post-buckling behaviour

Foryś, P.

doi:10.1016/j.tws.2015.07.012

Cited by 30 publications

(7 citation statements)

References 25 publications

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“…Some of them [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] investigated the in uence of stiffener geometry on the buckling strength of cylindrical shells made of steel or aluminum with no cutouts under axial compressive loading. Some optimized [7][8][9][10][11][12][13][14][15][16][17] the design of the stiffeners on the shell surface. Weller and Singer [1] experimentally studied the effect of stiffeners on the buckling behavior.…”

Section: Literature Reviewmentioning

confidence: 99%

“…A number of researchers studied the buckling behavior of stiffened cylindrical shells made of metals. Some of them [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] investigated the in uence of stiffener geometry on the buckling strength of cylindrical shells made of steel or aluminum with no cutouts under axial compressive loading. Some optimized [7][8][9][10][11][12][13][14][15][16][17] the design of the stiffeners on the shell surface.…”

Section: Literature Reviewmentioning

confidence: 99%

“…By optimizing the height of the stiffeners and the span of T-shaped stiffener rings, the buckling load-carrying capacity was maximized. Foryś [7] optimized the internal diameter and the number of rings of ring-stiffened shells to maximize the critical buckling load by using modi ed particle swarm optimization method. Constraints were imposed on the volume of the material and the stability of the post-buckling behavior.…”

Section: Literature Reviewmentioning

confidence: 99%

“…In early studies [7][8][9][10][11][12][13][14], researchers were mainly interested in the optimization of stiffener dimensions such as height and width and the stiffeners were applied uniformly over the entire shell surface. Besides, only few studies [18][19][20][21] considered geometrical imperfections like cutouts on shell surface and conducted optimization.…”

Section: Literature Reviewmentioning

confidence: 99%

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Topography Optimization of Cylindrical Shells With Cutouts for Maximum Buckling Strength

Gokyer

Sonmez

2022

Preprint

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In the presence of cutouts, the buckling strength of shell structures under compression significantly decreases. In order to compensate this, these structures are reinforced with stiffeners. In this study, the objective is to optimize the stiffener geometry and pattern on a cylindrical shell with two square holes to maximize the buckling load capacity without increase in its weight. A finite element model is developed to evaluate the buckling load of the structure. A good correlation is observed between the nonlinear analysis results of the model and the numerical and experimental results reported in the literature. Optimization is achieved in two levels. In the first level, topography optimization is performed to obtain the optimal stiffener pattern over the shell surface based on linear eigenvalue buckling analysis. In the second level, the stiffener heights and the shell thickness are optimized using a local search algorithm, Nelder-Mead; the buckling load levels are obtained by carrying out nonlinear buckling analyses in ANSYS. A Python code is developed to implement the optimization method and conduct analyses in ANSYS. The results show that stiffeners need to be introduced around the cutouts and the regions near the top and bottom edges for maximum buckling load capacity. The results also reveal that stiffeners on the mid lateral surfaces of the cylinder do not make significant contribution to the buckling strength. The bucking load of the optimized stiffened geometry is 22% higher than that of the unreinforced geometry having the same weight.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

See 2 more Smart Citations

Topography Optimization of Cylindrical Shells With Cutouts for Maximum Buckling Strength

Gokyer

Sonmez

2022

Preprint

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“…In order to enhance the buckling strength of shells, engineers recommend the use of longitudinal and circular reinforcement [6]. Lvov et al [7] investigated the buckling behavior of steel sheathing of a reinforced wall with FRP coating.…”

Section: Introductionmentioning

confidence: 99%

Buckling Behavior of Semi-scale Steel Tank with Carbon Fiber Reinforced Polymer Ring Subjected to Lateral Uniform Pressure Loading

Khatuni

Showkati

2019

IJE

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A B S T R A C TResearch on increasing the buckling strength of tanks carrying fluid and also cylindrical shells of thinwalled steel in civil engineering and mechanics is important. This is due to the widespread use of these structures in the industry. Due to the low thickness of the body and also due to the pressure forces entering these tanks, these structures are exposed to lateral buckling. In this research, the use of Carbon Fiber Reinforced Polymer (CFRP) rings to enhance and increase the buckling strength of tanks has been investigated. For this study, a tank with dimensions close to the actual tanks has been built and reinforced by a CFRP ring against the buckling. The results of the experiment indicated that the use of CFRP reinforcing ring considerably enhanced the buckling and post-buckling capacity of the tank. Further, comparing the results obtained from the experimental and numerical analysis and the values extracted from the theoretical relationships suggested that the results are in good agreement.

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On Fast Design of Innovative Hierarchical Stiffened Shells Against Imperfections

Tian

Wang

Zhu

et al. 2017

Advances in Structural and Multidisciplinary Optimization

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Optimization of cylindrical shells stiffened by rings under external pressure including their post-buckling behaviour

Cited by 30 publications

References 25 publications

Topography Optimization of Cylindrical Shells With Cutouts for Maximum Buckling Strength

Topography Optimization of Cylindrical Shells With Cutouts for Maximum Buckling Strength

Buckling Behavior of Semi-scale Steel Tank with Carbon Fiber Reinforced Polymer Ring Subjected to Lateral Uniform Pressure Loading

On Fast Design of Innovative Hierarchical Stiffened Shells Against Imperfections

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