INVESTIGATION OF SMALL FATIGUE CRACKS .2. A PLASTICITY BASED MODEL OF SMALL FATIGUE-CRACK GROWTH

被引：15
|
作者：
EDWARDS, L
ZHANG, YH
机构：
[1] Fracture Research Group, Materials Discipline, Faculty of Technology, Milton Keynes
来源：
ACTA METALLURGICA ET MATERIALIA | 1994年 / 42卷 / 04期
关键词：
D O I：
10.1016/0956-7151(94)90161-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Based on experimental evidence from periodic plastic zone size, (PZS), measurements on growing small fatigue cracks, PZS ahead of crack tips has been suggested as a correlating parameter for small crack growth. In this paper, the PZS of small cracks are calculated by incorporating an equivalent friction stress into the BCS model. The retardation of small crack growth is considered by comparing the stress concentration ahead of blocked plastic zones to the strength of grain boundary barriers. It is demonstrated that the model can predict the growth behaviour of small cracks well and also provides reasonable predictions of fatigue lives where they are dominated by small crack growth.
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页码：1423 / 1431
页数：9
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