Enhancement of the fatigue strength assessment of welded components by consideration of mean and residual stresses in the crack initiation and propagation phases

被引:14
|
作者
Baumgartner, Joerg [1 ]
机构
[1] Fraunhofer Inst Struct Durabil & Syst Reliabil LB, Bartningstr 47, D-64289 Darmstadt, Germany
关键词
Residual stresses; Crack initiation; Crack propagation; Fatigue cracks; Fracture mechanics; Computation; Fatigue life; Prediction; STEEL; JOINTS; LIFE;
D O I
10.1007/s40194-016-0304-1
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
The starting point of the investigations presented in this paper is the simplified consideration of mean and residual stresses as well as the complete disregard of the complex failure mechanisms in the common fatigue standards and guidelines. An improved fatigue life assessment for welded components, which includes the crack initiation and propagation phase is the scope of this paper. The crack initiation phase is considered using the strain-life approach. The crack propagation life, starting from a technical crack of a depth of a = 0.5 mm, is derived by the application of linear-elastic fracture mechanics. In this two-phase approach, the mean and residual stresses are considered by using damage parameters for the initiation phase and effective stress intensity factors for the propagation phase. With this approach, a better understanding can be obtained of the influence of mean- and residual stresses and their influence on the course (slope k and knee point N-k) of the S-N curve. With this information to hand, a more reliable fatigue assessment can be achieved than is possible with the common standards and guidelines. With the proposed two-phase approach, higher permissible stresses can be allowed in the design phase, leading to resource-efficient, lightweight constructions.
引用
收藏
页码:547 / 558
页数:12
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