Fatigue crack propagation prediction of a pressure vessel mild steel based on a strain energy density model

Fatigue crack growth (FCG) rates have traditionally been formulated from fracture mechanics, whereas fatigue crack initiation has been empirically described using stress-life or strain-life methods. More recently, there has been efforts towards the use of the local stress-strain and similitude conce...

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Bibliographic Details
Published in:Frattura ed integritá strutturale 2017-10, Vol.11 (42), p.74-84
Main Authors: Huffman, P. J., Ferreira, J., Correia, J.A.F.O., De Jesus, A.M.P., Lesiuk, G., Berto, F., Fernandez-Canteli, A., Glinka, G.
Format: Article
Language:English
Subjects:
AMP
Crack initiation
Crack propagation
Energy
Fatigue
Fatigue Crack Growth
Fatigue failure
Flux density
Fracture mechanics
Growth rate
Low carbon steels
Mathematical models
Pressure
Pressure Vessel Steel
Pressure vessels
Propagation
Steel
Strain
Strain Energy
Stress
Stress propagation
Stress ratio
Stress-strain relationships
Unigrow Model
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Summary:Fatigue crack growth (FCG) rates have traditionally been formulated from fracture mechanics, whereas fatigue crack initiation has been empirically described using stress-life or strain-life methods. More recently, there has been efforts towards the use of the local stress-strain and similitude concepts to formulate fatigue crack growth rates. A new model has been developed which derives stress-life, strain-life and fatigue crack growth rates from strain energy density concepts. This new model has the advantage to predict an intrinsic stress ratio effect of the form ?ar=(?amp)?·(?max )(1-?), which is dependent on the cyclic stress-strain behaviour of the material. This new fatigue crack propagation model was proposed by Huffman based on Walkerlike strain-life relation. This model is applied to FCG data available for the P355NL1 pressure vessel steel. A comparison of the experimental results and the Huffman crack propagation model is made.
ISSN:1971-8993
1971-8993
DOI:10.3221/IGF-ESIS.42.09