Retardation of fatigue crack growth in aircraft aluminium alloys via laser heating - Numerical prediction of fatigue crack growth

被引：15

作者：

Schnubel, D. ^{[1
]}

Huber, N. ^{[1
]}

机构：

[1] Helmholtz Zentrum Geesthacht, Inst Mat Res, D-21502 Geesthacht, Germany

来源：

COMPUTATIONAL MATERIALS SCIENCE | 2012年 / 65卷

关键词：

Damage tolerance; Residual stress; Fatigue crack growth; Numerical fracture mechanics; Stress intensity factors; Numerical modelling; Welding simulation; RESIDUAL-STRESSES; DISTORTIONS; BEHAVIOR; SIMULATION; WELDMENTS; JOINTS;

D O I：

10.1016/j.commatsci.2012.07.047

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The presented study discusses a quantitative numerical approach for predicting the fatigue crack growth in AA2198-T8 C(T) 100 specimens containing one line of laser heating. By heating with a defocused laser residual stresses are introduced and the fatigue crack growth is retarded. The developed methodology, which investigates coupling of the structural process simulation, the extraction of the total stress intensity K-tot and the prediction of the resulting fatigue crack growth rates by an empirical crack growth law is stepwise validated on the basis of experimental results. The prediction is found to be highly accurate. Special attention needs to be given to the quality of the process simulation results because the prediction of fatigue crack growth is highly sensitive to the results obtained in this simulation step. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：461 / 469

页数：9

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