金属材料に平均応力の変動する繰返し応力を負荷した場合の疲労強度と強度線図に関する一考察

概要

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Fatigue tests of 7075 T 6 aluminum alloy under constant mean stress σ_m in the range of 0.20≦A≦∞(A=σ_a/σ_m) were carried out by use of a testing machine of Schenck type. Also, fatigue tests under cyclic varying mean stress σ_m' were performed by using a new type of cyclic creep testing machine. The results obtained are as follows: (1) The strength diagram σ_a-σ_m of stress cycle number N_2 by use of fatigue test results under a constant mean stress σ_m, is shown nearly by a straight line. In the same way, the strength dia-gram of cycle number N_2, by using fatigue test results under a cyclic varying mean stressσ_m', is shown nearly by a straight line. On the other hand, the strength diagram σ_m'-σ_m of cycle number N_2, which was counted from summation t_r of upper hold time in the test results of fatigue under only cyclic varying mean stress σ_m', is shown nearly by an ellipse. (2) Using the above three strength diagrams of same cycle number N_2, the strength diagram of σ_m-σ_m'-σ_a is represented by an elliptic-cone.
社団法人日本材料学会の論文
1976-06-15