OS2019 多結晶マグネシウム合金の疲労き裂進展挙動に及ぼすミクロ組織の影響(OS20-4 疲労と強度,OS-20 HCP金属の実験力学と計算力学)

概要

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This paper describes the fatigue crack propagation behavior of extruded AZ31B magnesium alloys (average grain size: approximately 15 and 119 μm, respectively). Fatigue crack propagation tests were performed on center cracked tension (CCT) specimens at a stress ratio of R=0.1 and a frequency of 10 Hz at room temperature. Loading axis was parallel to the extrusion direction; crack face was perpendicular to basal plane of each grain. The crack growth rate (da/dN) of the coarse-grained specimen was approximately 5 times higher than that of the fine-grained specimen. Fracture surfaces of the fine-grained and coarse-grained specimens showed various directional steps independent of macroscopic crack growth direction.
一般社団法人日本機械学会の論文
2011-07-16