LIFE PREDICTION OF 316 STAINLESS STEEL UNDER CREEP-FATIGUE LOADING |
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| Authors: | K. Yagi O. Kanemaru K. Kubo C. Tanaka |
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| Affiliation: | Creep Testing Division, National Research Institute for Metals, 2–3–12 Nakameguro, Meguro-ku, Tokyo 153, Japan |
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| Abstract: | Life prediction for creep-fatigue loading conditions should be related to creep damage mechanisms. In order to examine the effect of the creep damage mode on rupture life under creep-fatigue loading, a “combined creep-fatigue loading test” was carried out on 316 stainless steel. In this method, creep loading and fatigue loading are repeated alternately. The fracture criteria under combined loading closely depend on the creep fracture modes of the static creep test. A new life prediction method which uses this new fracture criterion is proposed. The criteria are changed when the creep damage mode varies. In order to verify the adequacy of this method, fatigue tests with a tensile strain-hold wave form were carried out. It is clear that rupture life in such fatigue tests is dependent on the chosen fracture criteria. |
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