Fatigue Strength Characteristics of Non-Combustible Mg Alloy (2nd Report, Effect of Mean Stress on Fatigue Strength)

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  • MORISHIGE Kazunori
    Department of Mechanical Engineering Science, Faculty of Engineering, Kyushu University,
  • MAEDA Yuna
    Department of Mechanical Engineering Science, Faculty of Engineering, Kyushu University,
  • HAMADA Shigeru
    九州大学大学院工学研究院
  • NOGUCHI Hiroshi
    Department of Mechanical Engineering Science, Faculty of Engineering, Kyushu University,

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Other Title
  • 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）
  • ナンネンセイ マグネシウム ゴウキン ノ ヒロウ キョウド トクセイ ダイ 2ホウ ヒロウ キョウド ニ オヨボス ヘイキン オウリョク ノ エイキョウ
  • 2nd Report, Effect of Mean Stress on Fatigue Strength
  • 第2報, 疲労強度に及ぼす平均応力の影響

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Abstract

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=107. The ignition point of non-combustible magnesium alloys is about 300 K higher than that of normal magnesium alloys because of calcium addition. It was clarified as follows. (1) In the range of σm=0100MPa, fatigue strength at N=107 of small hole specimens was about 30150% higher than that of small crack specimens. (2) In the range of σm>100MPa, fatigue strength at N=107 of small hole specimens decreased because of static cracks initiating around small hole at the first loading. (3) In the range of σmax<σ0.2, fatigue strength at N=107 of smooth specimens was estimated using modified Goodman diagram.

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