Abstract
The machine components used at elevated temperatures are commonly subjected to cyclic stresses in addition to static stress. This problem is in the medium state between fatigue and static creep, being one of the essential mechanical properties needed for design of high temperature machine components. In the present study, fatigue-creep interaction tests were performed for A2024 under stress rate-controlled triangular tensile-torsional stress wave at elevated temperature. Then the creep constitutive equation under multi-axial cyclic stresses is proposed on the basis of the formula of extended Norton-Bailey, and creep deformation behavior was numerically analyzed in comparison with the test results. It was found that these calculations slightly underestimated measured creep curves.
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