K-0734 動的引張りで破断させた予疲労アルミニウム合金の微視的表面観察(S10-2 衝撃材料試験における新展開(2))(S10 衝撃材料試験における新展開)

概要

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When a dynamic tensile load was given to low-cycle pre-fatigued aluminum alloys, A2219-T87 and A6061-T6, at a severe pre-fatigue condition, they showed lower ultimate strength than virgin specimens. In general, though aluminum alloys exhibit less strain rate sensitivity than steels, usually the higher strain rate is given to aluminum alloys, the slightly higher tensile strength appears. This tendency of virgin materials was not realized in the present series of pre-fatigue experiments. After the pre-fatigue, the dynamic tensile strength was almost the same level of the quasi-static one. In order to explore the cause of such deterioration, some microscopic observations on the surface of the fractured specimens were carried out with an electron probe microanalyzer (EPMA) and a scanning electron microscope (SEM). The SEM observation on the side surface of the specimen suggested that the number of very thin linear damages from opened cracks might be a phenomenon-controlling factor.
一般社団法人日本機械学会の論文
2001-08-22