Authors
Abstract
In some applications, the aluminum alloy 2024 T4 may be subjected to an
interaction of fatigue and creep effects at high temperature. This paper investigates
the effect of this interaction by studying the effect of constant amplitude fatigue
(CAF) and creep separately, and then fatigue-creep interaction is introduced by
testing the alloy under constant amplitude with some holding time periods through
the test at high temperature (150 oC). The results showed that the life time of the
alloy decreases due to fatigue-creep interaction as compared to creep alone in
about 77%, and in about 80% as compared with fatigue alone. This is a result of
accumulated fatigue damage superimposed on creep damage. Creep allows more
free spaces for fatigue cracks paths that accelerate failure. A theoretical model to
calculate the time to failure due to fatigue-creep interaction has been proposed.
This theoretical interaction model predicts very close time to failure values to the
experimental results.
Keywords
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