An Investigation of the Creep Lifetime of 75S-T6 Aluminum-alloy Columns

by Eldon E. Mathauser, William A. Brooks

1954

The results of short-time elevated-temperature creep tests of 75S-T6 aluminum-alloy columns are presented and examined with the objective of obtaining procedures for predicting column lifetime. Semiempirical lifetime curves are obtained withthe air of a previously published column creep theory and are used for deriving column curves. The semiempirical lifetime curves are also used to study the effect of varying applied stress and out-of-straightness. In the range considered, small variations of out-of-straightness are found to be of little practical significance; whereas, small stress variations change column lifetime considerably. For the range of out-of-straightness encountered in the tests, the data can be presented in plots that do no explicitly include out-of-straightness, and plots of this type should be satisfactory for predicting column lifetime for design purposes.