Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 33, Issue 11, Pages 1426-1434Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2011.05.008
Keywords
Friction stir weld; Residual stress; Fatigue crack growth; Closure model; Prediction
Funding
- European Commission [AST5-CT-2006-030825]
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The use of residual K (K(res)) approaches for prediction of fatigue crack growth rates in residual stress fields was studied. Finite element models of the samples were built and the measured residual stress data put into the model. The virtual crack closure technique (VCCT) was used to calculate K(res) (stress intensity factor from residual stress) together with its changes with crack length using data from the part I paper. Local K(res) values were used to calculate effective R values. K(op) and Delta K(eff) values throughout the crack path in the weld. The master curve approach was used to relate these to corresponding values for crack growth rates. Predicted crack growth rates were compared with experimental results. Changes in crack growth rate found as the crack grows through the weld can successfully be predicted via application of this closure based model. Agreement between predictions and experimental data was best for tensile residual stress fields and was not as exact in compression. Possible reasons for this discrepancy are discussed. (C) 2011 Elsevier Ltd. All rights reserved.
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