An effort has been made to determine the applicability of the hypothesis of cumulative damage to intermittent cycles of creep loading on the aluminum alloys 2024-T4 and 7075-T6. A comparison is made on creep buckling lifetimes for in¬termittent loading tests with continuous load tests for creep buckling specimens; and a similar comparison is made for tension creep specimens with the master rupture parameter, TR (C + log 10t). Seven buckling specimens were tested under spectrum loadings in an evaluation of creep under multiple stress levels.
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