SUS 304鋼のクリープ疲労相互作用に対する線形寿命損傷則による評価と破壊様相

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The combined creep-fatigue tests, in which the creep loading and fatigue loading are repeated alternately, were carried out on SUS 304 stainless steel up to 3000 hr at 700℃. The data obtained were analyzed using different linear damage rules, and the relationship between the results evaluated by them and the appearance of fracture was discussed. When the creep damage was assumed to be defined as Σt_c/t_r. (where Σt_c is the time spent under creep stress, σ_c, in the combined creep-fatigue test, and t_r is the time to rupture under σ_c in the creep test), the sum of creep and fatigue damage depended on a. and the degree of work hardening due to the cyclic deformation under fatigue loading. When the creep damage was assumed to be defined as Σε_c/ε_f (where Σε_c is the sum of creep strain accumulated in the combined creep-fatigue test, and ef is the true strain at fracture in the creep test), a better correlation between creep and fatigue damage was obtained with no dependence on the test variables of the combined creep-fatigue test. For higher creep damages the sum of creep and fatigue damage was less than I because the fracture resulted from the linkage of grain boundary cracks. The important factors of creep-fatigue interaction under the combined creep-fatigue loadings were found to be the work hardening due to the cyclic deformation under fatigue loading and the linkage of grain boundary cracks.
社団法人日本材料学会の論文
1980-09-15

SUS 304鋼のクリープ疲労相互作用に対する線形寿命損傷則による評価と破壊様相

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