Investigations of local/global buckling of cylindrical metal silos with corrugated sheets and open-sectional column profiles

The present paper deals with a new analytical approach of nonlinear global buckling of spiral corrugated functionally graded carbon nanotube reinforced composite (FG-CNTRC) cylindrical shells subjected to radial loads. The equilibrium equation system is formulated by using the Donnell shell theory with the von Karman’s nonlinearity and an improved homogenization model for spiral corrugated structure. The obtained governing equations can be used to research the nonlinear postbuckling of mentioned above structures. By using the Galerkin method and a three term solution of deflection, an approximated analytical solution for the nonlinear stability problem of cylindrical shells is performed. The linear critical buckling loads and postbuckling strength of shells under radial loads are numerically investigated. Effectiveness of spiral corrugation in enhancing the global stability of spiral corrugated FG-CNTRC cylindrical shells is investigated.

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A Finite Element Study on Compressive Resistance Degradation of Square and Circular Steel Braces under Axial Cyclic Loading

Applied Sciences ◽

10.3390/app11136094 ◽

2021 ◽

Vol 11 (13) ◽

pp. 6094

Author(s):

Hubdar Hussain ◽

Xiangyu Gao ◽

Anqi Shi

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Cyclic Loading ◽

Slenderness Ratio ◽

Hysteretic Behavior ◽

Element Analysis ◽

Section Shape ◽

Axial Cyclic Loading ◽

Global Buckling ◽

Parametric Studies

In this study, detailed finite element analysis was conducted to examine the seismic performance of square and circular hollow steel braces under axial cyclic loading. Finite element models of braces were constructed using ABAQUS finite element analysis (FEA) software and validated with experimental results from previous papers to expand the specimen’s matrix. The influences of cross-section shape, slenderness ratio, and width/diameter-to-thickness ratio on hysteretic behavior and compressive-tensile strength degradation were studied. Simulation results of parametric studies show that both square and circular hollow braces have a better cyclic performance with smaller slenderness and width/diameter-to-thickness ratios, and their compressive-tensile resistances ratio significantly decreases from cycle to cycle after the occurrence of the global buckling of braces.

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Buckling characteristics of cut-out borne composite stiffened hyperbolic paraboloid shell panel

Proceedings of the Institution of Mechanical Engineers Part L Journal of Materials Design and Applications ◽

10.1177/14644207211005802 ◽

2021 ◽

pp. 146442072110058

Author(s):

Sarmila Sahoo

Keyword(s):

Finite Element ◽

Orientation Angle ◽

Buckling Load ◽

Benchmark Problems ◽

Hyperbolic Paraboloid ◽

Element Analysis ◽

Load Effect ◽

Global Buckling ◽

Fiber Orientation Angle ◽

Shell Panel

The present study investigates buckling characteristics of cut-out borne stiffened hyperbolic paraboloid shell panel made of laminated composites using finite element analysis to evaluate the governing differential equations of global buckling of the structure. The finite element code is validated by solving benchmark problems from literature. Different parametric variations are studied to find the optimum panel buckling load. Laminations, boundary conditions, depth of stiffener and arrangement of stiffeners are found to influence the panel buckling load. Effect of different parameters like cut-out size, shell width to thickness ratio, degree of orthotropy and fiber orientation angle of the composite layers on buckling load are also studied. Parametric and comparative studies are conducted to analyze the buckling strength of composite hyperbolic paraboloid shell panel with cut-out.

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