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Proceedings Paper

AFM observations of grain boundary step in low-cycle fatigue in copper
Author(s): Junji Ohgi; Kenji Hatanaka
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Paper Abstract

The push-pull low cycle fatigue test were performed under the strain-controlled condition and the step height formed at grain boundary, which is precursors of crack initiation, was measured in annealed copper using AFM. Then the step growth behaviors in cyclic loading process were compared with the one obtained from fatigue test performed under stress-controlled condition. In the early fatigue process, grain boundary step was not formed under strain-controlled condition. In the early fatigue process, grain boundary step was not formed under strain-controlled condition, whereas steps with 20-50nm in height were generated under stress- controlled condition. The critical step height at grain boundary at crack initiation Hc was quite large under strain controlled condition as compared with the one under stress controlled condition.

Paper Details

Date Published: 13 June 2001
PDF: 5 pages
Proc. SPIE 4317, Second International Conference on Experimental Mechanics, (13 June 2001); doi: 10.1117/12.429588
Show Author Affiliations
Junji Ohgi, Yamaguchi Univ. (Japan)
Kenji Hatanaka, Yamaguchi Univ. (Japan)


Published in SPIE Proceedings Vol. 4317:
Second International Conference on Experimental Mechanics
Fook Siong Chau; Chenggen Quan, Editor(s)

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