Early cracking orientation under high stress gradients: The fretting case

被引:38
作者
Araujo, J. A. [1 ]
Almeida, G. M. J. [1 ]
Ferreira, J. L. A. [1 ]
da Silva, C. R. M. [1 ]
Castro, F. C. [1 ]
机构
[1] Univ Brasilia, Dept Mech Engn, BR-70910900 Brasilia, DF, Brazil
关键词
Fretting; Stress gradient; Critical plane approach; Cracking orientation; FATIGUE-STRENGTH; WOHLER CURVE; PLANE; PREDICTION; GROWTH; AMPLITUDE;
D O I
10.1016/j.ijfatigue.2016.12.013
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Many fretting contacts experience a rapid variation of the magnitude and relative contribution of the stress components away from the surface. This feature of the fretting problem poses an additional difficulty for the modeling of the early cracking orientation. In this work, critical plane approaches associated with a process zone are evaluated by taking into account the fretting crack behavior observed in two different steels. The results show that the conventional approaches may provide inconsistent cracking directions. A new method for early cracking orientation prediction is developed by employing the average values of the normal and shear stresses along a critical direction. This method is simpler to implement and improves the estimates when compared to the other approaches. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:611 / 618
页数:8
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