Effects of ringed stiffener on the buckling behavior of cylindrical shells with cutout under axial compression: Experimental and numerical investigation

In this study, the buckling behavior of optimum laminated composite cylindrical shells subjected to axial compression and external pressure are studied. The cylindrical shells are composed of multi orthotropic layers that the principal axis gets along with the shell axis (x). The number of layers and the fiber orientation of layers are selected as optimization design variables with the aim to find the optimal laminated composite cylindrical shells. The optimization procedure was formulated with the objective of finding the highest buckling pressure. The Genetic Algorithm (GA) and Imperialist Competitive Algorithm (ICA) are two optimization algorithms that are used in this optimization procedure and the results were compared. Also, the effect of materials properties on buckling behavior was analyzed and studied.

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Buckling Behavior of Elliptical Shells of Changing Thickness under Uniform Axial Compression

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.351-352.492 ◽

2013 ◽

Vol 351-352 ◽

pp. 492-496 ◽

Cited By ~ 1

Author(s):

Li Wan ◽

Lei Chen

Keyword(s):

Axial Compression ◽

Cylindrical Shells ◽

Imperfection Sensitivity ◽

Buckling Mode ◽

Buckling Strength ◽

Shell Buckling ◽

Buckling Behavior ◽

Structural Applications ◽

Post Buckling ◽

Shell Geometry

Many elliptical shells are used in structural applications in which the dominant loading condition is axial compression. Due to the fact that the radius varies along the cross-section midline, the buckling behavior is more difficult to identify than those of cylindrical shells. The general concerned aspects in cylindrical shell buckling analyses such as the buckling mode, the pre-buckling deformation and post-buckling deformation are all quite different related to specific elliptical shell geometry. The buckling behavior of elliptical cylindrical shells with uniform thickness has been widely studied by many researchers. However, the thickness around the circumference may change for some specific structural forms, the femoral neck for example, which makes the buckling behavior more complex. It is known that the buckling strength of thin cylindrical shells is quite sensitive to imperfections, so it is natural to explore the imperfection sensitivity of elliptical shells. This paper explores the buckling behavior of imperfect elliptical shells under axial compression. It is hoped that the results will make a useful contribution in this field.

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The Effects of Unreinforced Circular Cutouts on the Buckling of Circular Cylindrical Shells Under Axial Compression

Journal of Engineering for Industry ◽

10.1115/1.3604686 ◽

1968 ◽

Vol 90 (4) ◽

pp. 541-546 ◽

Cited By ~ 41

Author(s):

R. C. Tennyson

Keyword(s):

Axial Compression ◽

Circular Cylindrical Shell ◽

Cylindrical Shells ◽

Recent Theory ◽

Membrane Stress ◽

Buckling Behavior ◽

Curvature Parameter ◽

Circular Cylindrical Shells ◽

Concentration Factors ◽

Stress Concentration Factors

The effects of unreinforced circular cutouts on the buckling behavior of circular cylindrical shells subjected to axial compression have been investigated. In addition, the membrane stress distribution and isoclinic patterns were determined around the edge of the cutout, using photoelastic shells, and the results compared with recent theory. The membrane stress concentration factors were found to increase rapidly with increasing values in the curvature parameter β. Large reductions in the critical buckling loads occurred for relatively small cutouts (e.g., a 50 percent reduction in the collapse load was found for a/R = 0.10). As a result of the investigation, design information is provided for determining the effect of a/R on the critical buckling load of a circular cylindrical shell.

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A numerical investigation into the plastic buckling paradox for circular cylindrical shells under axial compression

Engineering Structures ◽

10.1016/j.engstruct.2014.05.050 ◽

2014 ◽

Vol 75 ◽

pp. 429-447 ◽

Cited By ~ 12

Author(s):

Rabee Shamass ◽

Giulio Alfano ◽

Federico Guarracino

Keyword(s):

Numerical Investigation ◽

Axial Compression ◽

Cylindrical Shells ◽

Plastic Buckling ◽

Circular Cylindrical Shells

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Buckling of Circular Cylindrical Shells Using a Displacement Function

Journal of Engineering for Industry ◽

10.1115/1.3438513 ◽

1974 ◽

Vol 96 (4) ◽

pp. 1322-1327

Author(s):

Shun Cheng ◽

C. K. Chang

Keyword(s):

Boundary Conditions ◽

Axial Compression ◽

Cylindrical Shells ◽

External Pressure ◽

Displacement Function ◽

Combined Loading ◽

Trial Solution ◽

Governing Differential Equation ◽

Circular Cylindrical Shells ◽

The Stability

The buckling problem of circular cylindrical shells under axial compression, external pressure, and torsion is investigated using a displacement function φ. A governing differential equation for the stability of thin cylindrical shells under combined loading of axial compression, external pressure, and torsion is derived. A method for the solutions of this equation is also presented. The advantage in using the present equation over the customary three differential equations for displacements is that only one trial solution is needed in solving the buckling problems as shown in the paper. Four possible combinations of boundary conditions for a simply supported edge are treated. The case of a cylinder under axial compression is carried out in detail. For two types of simple supported boundary conditions, SS1 and SS2, the minimum critical axial buckling stress is found to be 43.5 percent of the well-known classical value Eh/R3(1−ν2) against the 50 percent of the classical value presently known.

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