Mg合金の疲労き裂進展に及ぼす過大荷重の影響

張 学超, 森 敬祐, 真壁 朝敏, 井上 晋一, 安藤 新二

doi:10.2472/jsms.70.473

Mg合金の疲労き裂進展に及ぼす過大荷重の影響

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張学超

琉球大学理工学研究科大学院生
森敬祐

同和鍛造(株)
真壁朝敏

琉球大学工学部
井上晋一

熊本大学先進マグネシウム国際研究センター
安藤新二

熊本大学先進マグネシウム国際研究センター

書誌事項

タイトル別名

Effects of Overload on Fatigue Crack Growth in Mg Alloys
Mg ゴウキンノヒロウキレツシンテンニオヨボスカダイカジュウノエイキョウ

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抄録

<p>Push-pull fatigue tests of rolled magnesium alloys AZ31 and AZX912 were performed with a side-notch plate specimen to examine the effect of a single overload on the crack growth behavior under a stress ratio of -1. The behavior in retardation of crack growth was unclear in the case of AZ31 because the crack growth rate was relatively higher at the overload point. However, this was observed clearly, when the branching of the crack tip happened in the case of AZX912. The geometry of the fracture surface and the changes in crack growth path were related to the crack growth behavior. The crack opening level became higher when the crack growth rate was lower. Therefore, the crack closure is related to the retardation of the crack growth rate. When the branching of a crack tip occurred, not only the residual compression stress at crack front but also the variation of local crack growth direction after overload affected the fatigue crack growth behavior. </p>