期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 45, 期 -, 页码 1-7出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2012.06.019
关键词
Short fatigue cracks; Collective evolution; High temperature; Fractal dimension; Plastic strain energy density
资金
- National Natural Science Foundation of China [50771024]
This paper proposes a Paris-type damage model to investigate the collective evolution of short fatigue cracks based on fractal theory. On the basis of experimentally determined images, the fractal dimensions (FDs) of rounded notched specimens' surfaces are numerically calculated by using Otsu threshold segmentation and box-counting dimension method. The results show that FDs' evolution presents HILL curves' characteristics. The transition period between FD rapid growth stage and FD constant stage takes place at about 30% of fatigue life. The good match between experimental results and FEM analyses reveals the model can describe collective damage process caused by all fatigue cracks. (C) 2012 Elsevier Ltd. All rights reserved.
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