Experimental creep buckling of aluminum cylinders in axial compression

1969 ◽  
Vol 9 (8) ◽  
pp. 356-365 ◽  
Author(s):  
R. Papirno ◽  
R. Goldman
Keyword(s):  
Axial Compression ◽  
Creep Buckling ◽  
Experimental Creep

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.

Creep buckling of cylindrical shells under axial compression

1967 ◽  
Vol 284 (5) ◽  
pp. 320-325 ◽  
Author(s):  
Francis W. French ◽  
Sharad A. Patel ◽  
B. Venkatraman
Keyword(s):  
Axial Compression ◽  
Cylindrical Shells ◽  
Creep Buckling

A Simplified Approach to Creep Buckling of Structures Under Varying Loads

1980 ◽  
Vol 102 (3) ◽  
pp. 303-308 ◽  
Author(s):  
J. M. Chern
Keyword(s):  
Axial Compression ◽  
Constant Temperature ◽  
Critical Strain ◽  
Experimental Results ◽  
Test Results ◽  
Numerical Examples ◽  
Simplified Approach ◽  
Special Cases ◽  
Creep Buckling ◽  
Life Fraction

A critical strain approach to the prediction of creep buckling time in structures under varying loads is investigated and its relationship with the conventional linear cumulative damage (life-fraction) approach is established under condition of constant temperature. The latter approach is shown to be inconsistent in some special cases and may result in overprediction or underprediction of creep buckling time depending on whether the loads are monotonically increasing or decreasing. Numerical results obtained with the present approach are compared with incremental solutions for columns, and with recently available theoretical and experimental results of cylindrical shells under axial compression. These comparisons indicate that the critical strain approach is suitable for use in design analysis. Further investigations are needed to assess the effect of varying temperature, which is excluded in the numerical examples because no test results are available for comparison.

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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