1106 超高真空中における疲労破面の特徴(OS11-2 材料の疲労挙動と損傷評価-き裂発生・進展-)

概要

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In order to clarify the formation factors of fine concavo-convexo region on the fracture surface of sub-surface fractures in very high cycle fatigue, crack growth tests of Ti-6Al-4V were conducted in ultra high vacuum and the effects of vacuum environment and repeating number of cycles on fracture surfaces were investigated. As a result, the fine concavo-convexo regions were formed in vacuum and the area ratio of them increased with increasing number of cycles. The fine concavo-convexo regions; however, were not formed in crack growth tests in air. These results coincided with the formation factors of ODA in high strength steel, therefore, it was concluded that long term cyclic loadings in vacuum-like environment around sub-surface crack is the main reason for the formation of fine concavo-convexo fracture surfaces regardless of materials.
2010-10-09