3D observation and image-based finite element analyses of fatigue crack propagation in an Al-Mg-Si alloy

P. Qu, H. Toda, H. Zhang, L. Qian, M. Sakaguchi, M. Kobayashi, K. Uesugi

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

1 被引用数 (Scopus)

抄録

3D fatigue crack opening and propagation behaviors in an Al-Mg-Si alloy have been investigated in this study. A combined methodology of an in-situ 3D crack visualization via the synchrotron X-ray CT and image-based numerical simulation which takes into account real crack morphology has been applied for the study. The details of a crack with non-planar torturous crack morphology have been observed and many essential features of the crack and its opening/propagation inside the material have been identified. Typical example would be the complex deformation behaviors in the region where two crack segments lying on different horizontal planes overlap each other, and the influence of complicated crack front line on local crack driving forces. We recognized that two overlapping crack segments affected significantly the local crack driving force ΔkI each other, and large mode III displacement occurred near the edge of overlapping region. The region next to overlapping was influenced to a relatively large extent through shielding the near-tip stress/strain fields thereby reducing the local crack driving forces. We also found that the sharp extrusion on crack front line had no significant influence on neighboring cracks. The combined methodology of the in-situ 3D crack visualization and the image-based numerical simulation has been demonstrated to be powerful and feasible in revealing and understanding various fracture phenomena inside materials.

本文言語英語
ホスト出版物のタイトルTHERMEC 2009 Supplement
ページ449-454
ページ数6
DOI
出版ステータス出版済み - 2010
外部発表はい
イベント6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009 - Berlin, ドイツ
継続期間: 8 25 20098 29 2009

出版物シリーズ

名前Advanced Materials Research
89-91
ISSN(印刷版)1022-6680

その他

その他6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009
Countryドイツ
CityBerlin
Period8/25/098/29/09

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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