動クリープおよび高温疲労の寿命に関する一考察

概要

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For prediction of the rupture life of metals subjected to reversed stressing of stress amplitude σ_a under a constant mean stressσ_m at elevated temperatures, the linear damage rule was adapted and its rupture life was analized by partitioning of parameter A, or the stress ratioσ_a/σ_m. In the range of 0≦A≦1, an equivalent static stressσ_<me> for rupture life was determined by use of A and slope α_t of rupture life curves based onσ_m. If rupture life curves of static creep are given, it is possible to predict approximately the rupture life curve of dynamic creep by calculation. In the range of 1≦A≦∞, an equivalent alternating stressσ_<ae> for fatigue life was determined by using A and slope α_t of completely reversed life curves based onσ_a. Therefore, a fatigue life curve for any mean stress will be predicted analytically from the completely reversed fatigue life curves.
社団法人日本材料学会の論文
1976-06-15