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Three-Dimensional Characterization of Fatigue Crack Propagation Behavior in an Aluminum Alloy Using High Resolution X-Ray Microtomography

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Abstract:

Synchrotron X-ray microtomography was used to investigate the three-dimensional fatigue crack propagation behavior of an aluminum alloy. Local crack growth rates along specimen thickness were calculated. Crack observation revealed that crack propagation was retarded in three regions where there exist overlapping crack segments. Crack growth retardation was found to occur in these crack overlapping regions due to stress shielding. Observation of crack propagation process indicated that one of the overlapping crack segments initiated from the twisted crack. Crack tip opening displacement was measured and it was found that crack opening was larger in single planar crack region than that in crack overlapping region.

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Periodical:

Materials Science Forum (Volumes 638-642)

Pages:

378-383

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.638-642.378

Citation:

Cite this paper

Online since:

January 2010

Authors:

Hui Zhang, Peng Cheng Qu, Yuuji Sakaguchi, Hiroyuki Toda, Masakazu Kobayashi, Kentaro Uesugi, Yoshio Suzuki

Keywords:

Crack Opening Displacement, Fatigue Crack Propagation, Microtomography

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