Abstract
The present report covers the results of the benchmark project (B) by the Subcommittee on Inelastic Analysis and Life Prediction of High Temperature Materials, the Society of Materials Science, Japan, concerning the fatigue-creep life prediction under multiaxial stress condition of combined tension-compression and cyclic torsion. Multiaxial fatigue-creep tests for 214Cr−1Mo steel at 600°C were performed under both in-phase and out-of-phase strain-controlled wave patterns. Seven types of life prediction methods were employed; they are linear damage rule, strain range partitioning method, and methods by Majumdar, Ostergren, Krempl, Lemaitre-Plumtree-Chaboche and Bui-Quoc. In applying these methods two sets of life prediction schemes are adopted. One is the normal way that the fatigue-creep lives are predicted by the experimentally obtained stress-strain response. Life prediction in the other way is made by employing the calculated stress-strain relation by means of ten kinds of constitutive models described in the report of benchmark project (A). The predicted lives thus obtained were compared with the experimental data, and the accuracy of the life prediction methods was extensively discussed.
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