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Experimental creep buckling of aluminum cylinders in axial compression

Experimental creep-buckling times of aluminum alloy 2024-0 circular cylinders tested at 500° F are compared with predictions of Gerard's unified theory of creep buckling of structural elements

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Abstract

Creep-buckling tests were conducted on aluminum alloy 2024-0 circular cylinders in axial compression at 500° F having nominalR/t values of 90 and 50. Creep-buckling times for a variety of applied creep-stress values were compared with theoretical predictions of Gerard's unified theory of creep buckling of columns, plates and shells. In this theory, creep-buckling solutions are analogous to plastic-buckling solutions, provided that the material parameters used in the theoretical relation are developed from constant-strain-rate stress-strain data derived by a graphical process from compressive-creep data. The theoretical data were evaluated using appropriate classical plastic-buckling theory and previously obtained creep data on the 2024-0 aluminum material at 500° F.

End shortening of the cylinders was autographically recorded during the tests and creep-buckling times were obtained from an analysis of the end-shortening record. A comparison of theory and test data indicated that the theory was somewhat conservative in predicting creep-buckling times. The discrepancy may have been due, in part, to the uncertainty in determining the precise time at which the experimental cylinders buckled. The cylinders withR/t∼90 buckled in the axisymmetric mode for the lower creep stresses while, forR/t∼50, all buckling occurred in the axisymmetric mode.

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Authors and Affiliations

  1. Army Materials and Mechanics Research Center, Watertown, Mass.

    R. Papirno (Research Mechanical Engineer)

  2. Sanders Associates, Cambridge, Mass.

    R. Goldman (Staff Engineer)

Authors
  1. R. Papirno
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  2. R. Goldman
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Additional information

The study described here was performed at Allied Research Associates, Inc., under sponsorship of the U. S. Army Research Office, Durham, North Carolina, Project No. ARO-D-5469-E.

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Papirno, R., Goldman, R. Experimental creep buckling of aluminum cylinders in axial compression. Experimental Mechanics 9, 356–365 (1969). https://doi.org/10.1007/BF02327713

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