The Effect of Geometric Nonlinearities on the Creep Buckling Time of Axially Compressed Circular Cylindrical Shells

1975 ◽  
Vol 42 (1) ◽  
pp. 225-226 ◽  
Author(s):  
N. J. Hoff
Keyword(s):  
Cylindrical Shells ◽  
Geometric Nonlinearities ◽  
Creep Buckling ◽  
Circular Cylindrical Shells

Bifurcation Buckling of Circular Cylindrical Shells Subjected to Axial Compression During Creep Deformation

1993 ◽  
Vol 115 (3) ◽  
pp. 268-274 ◽  
Author(s):  
N. Miyazaki ◽  
S. Hagihara
Keyword(s):  
Creep Deformation ◽  
Cylindrical Shells ◽  
Initial Imperfection ◽  
Experimental Investigations ◽  
The Finite Element Method ◽  
Bifurcation Buckling ◽  
Creep Buckling ◽  
Circular Cylindrical Shells ◽  
Deformation Patterns ◽  
Circumferential Waves

In the present work, analytical and experimental investigations were performed on creep buckling. Special attention was focussed on bifurcation behavior during creep deformation. The finite element method was used to analyze creep buckling of circular cylindrical shells without initial imperfection. The number of circumferential waves obtained from the analyses agrees well with those of the experiments. The present experimental investigation shows that the circumferential waves are suddenly caused near a bulge. It is also found that there is no correlation between the wavelength of the circumferential waves observed at creep buckling and that of the circumferential initial imperfection. Deformation patterns at the bifurcation creep buckling obtained from the analyses are analogous to those of the experiments. It is concluded from the analyses and the experiments that the circumferential waves observed in creep buckling experiments are due to bifurcation buckling during creep deformation.

Experimental Investigation of Creep Buckling of Circular Cylindrical Shells Under Axial Compression and Bending

1968 ◽  
Vol 90 (4) ◽  
pp. 589-595 ◽  
Author(s):  
Lars A˚ke Samuelson
Keyword(s):  
Experimental Investigation ◽  
Axial Compression ◽  
Cylindrical Shells ◽  
Critical Time ◽  
Approximate Theory ◽  
Pure Bending ◽  
Creep Buckling ◽  
Stress Levels ◽  
Circular Cylindrical Shells ◽  
Pure Compression

The results are presented of an experimental investigation of creep buckling of circular cylindrical shells. The test specimens, manufactured from an aluminum alloy similar to 24S, had radius to thickness ratios between 30 and 150 and length to radius ratios greater than 2. They were subjected to axial compression or bending at a temperature of 225 deg C (430 deg F) and at various stress levels. The critical time under a constant load was determined as a function of the stress level, the shell geometry, and the type of loading. It was found that the shells subjected to pure compression had a substantially shorter lifetime than those subjected to pure bending with the same maximum applied stress. The thickest test specimens failed through collapse into a “wrinkling” mode which for the pure compression case is axisymmetric, whereas the thinner cylinders buckled into a typical diamond pattern. In all cases, buckling occurred at one of the edges. The postbuckling configuration was found to depend not only on the geometry of the shell but also on the load level. For very low stress levels, even the thinner cylinders buckled in the short wave pattern (symmetric for compression). A comparison between the present experimental results and theoretical values of the critical time presented in earlier works showed that a fairly good estimate may be obtained for the case of axial compression, whereas the approximate theory for creep buckling under pure bending gives an unduly conservative result.

Buckling at High Temperature

1957 ◽  
Vol 61 (563) ◽  
pp. 756-774 ◽  
Author(s):  
N. J. Hoff
Keyword(s):  
High Temperature ◽  
High Temperatures ◽  
Thermal Stresses ◽  
Cylindrical Shells ◽  
Creep Buckling ◽  
Circular Cylindrical Shells

SummaryHigh temperatures affect buckling because the properties of the materials change and because thermal stresses and creep develop. A survey is given of the known solutions of problems arising in consequence of these phenomena and new theories of the creep buckling of columns and of thin circular cylindrical shells are presented.

Creep Buckling Analyses of Circular Cylindrical Shells Under Axial Compression—Bifurcation Buckling Analysis by the Finite Element Method

1987 ◽  
Vol 109 (2) ◽  
pp. 179-183 ◽  
Author(s):  
N. Miyazaki
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cylindrical Shell ◽  
Axial Compression ◽  
Circular Cylindrical Shell ◽  
Cylindrical Shells ◽  
The Finite Element Method ◽  
Bifurcation Buckling ◽  
Creep Buckling ◽  
Circular Cylindrical Shells

The finite element method is applied to the creep buckling of circular cylindrical shells under axial compression. Not only the axisymmetric mode but also the bifurcation mode of the creep buckling are considered in the analysis. The critical time for creep buckling is defined as either the time when a slope of a displacement versus time curve becomes infinite or the time when the bifurcation buckling occurs. The creep buckling analyses are carried out for an infinitely long and axially compressed circular cylindrical shell with an axisymmetric initial imperfection and for a finitely long and axially compressed circular cylindrical shell. The numerical results are compared with available analytical ones and experimental data.

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