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

Published on Sep 29, 2017in Fracture and Structural Integrity
· DOI :10.3221/IGF-ESIS.42.09
P. J. Huffman5
Estimated H-index: 5
(John Deere),
Joao P. Ferreira10
Estimated H-index: 10
(University of Porto)
+ 5 AuthorsG. Glinka1
Estimated H-index: 1
(UW: University of Waterloo)
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.
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