Open AccessFatigue crack propagation prediction of a pressure vessel mild steel based on a strain energy density model
Author(s) -
Peter Huffman,
A.J.M. Ferreira,
José A.F.O. Correia,
Abílio M.P. De Jesus,
Grzegorz Lesiuk,
F. Berto,
Alfonso FernándezCanteli,
G. Glinka
Publication year - 2017
Publication title -
frattura ed integrità strutturale
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.368
H-Index - 19
ISSN - 1971-8993
DOI - 10.3221/igf-esis.42.09
Subject(s) - fracture mechanics , materials science , strain energy density function , structural engineering , paris' law , crack closure , strain (injury) , strain energy , pressure vessel , stress (linguistics) , crack growth resistance curve , strain energy release rate , mechanics , composite material , finite element method , engineering , physics , medicine , linguistics , philosophy
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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