1315 特異な異方性を有する工業用純アルミニウム薄板の疲労き裂進展経路の機構(S21-1 軽金属の疲労,S21 金属材料の疲労特性と破壊機構)

概要

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Mechanism of fatigue crack path in anisotropic pure aluminum sheets was investigated using as received and annealed CCT-specimens. From fatigue tests, it were found that the crack grew to the rolling direction about 30 degrees towards loading direction in as received specimen, but not for specimen annealed in 290℃, 30 minutes. According to the fracture surface examination and pole figure determination using X-ray diffraction, it was confirmed that slip plane (111) mainly existed in the rolling direction and the fracture surface of the crack that grew on the rolling direction. Fatigue crack that grows to the rolling direction as mixed mode I-II crack is caused by the strong texture of slip plane (111) in the rolling direction that makes simple slip system and the mode II crack easily occurs so that the crack propagates to the rolling direction as continuous crack initiation process.
2005-09-18