難燃性マグネシウム合金の疲労強度特性 : 第2報,疲労強度に及ぼす平均応力の影響

概要

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Rotating bending tests and tension-compression fatigue tests on non-combustible magnesium alloy were carried out to investigate effect of mean stress on fatigue strength at N=10^7. The ignition point of non-combustible magnesium alloys is about 300K higher than that of normal magnesium alloys because of calcium addition. It was clarified as follows. (1) In the range of σ_m=0〜100MPa, fatigue strength at N=10^7 of small hole specimens was about 30〜150% higher than that of small crack specimens. (2) In the range of σ_m>100MPa, fatigue strength at N=10^7 of small hole specimens decreased because of static cracks initiating around small hole at the first loading. (3) In the range of σ_<max><σ_<0.2>, fatigue strength at N=10^7 of smooth specimens was estimated using modified Goodman diagram.
社団法人日本機械学会の論文
2008-01-25