Fatigue crack propagation prediction of a pressure vessel mild steel based on a strain energy density model
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http://orcid.org/0000-0002-4148-9426
A.M.P. De Jesus
INEGI, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
http://orcid.org/0000-0002-1059-715X
G. Lesiuk
Faculty of Mechanical Engineering, Department of Mechanics, Material Science and Engineering, Wrocław University of Science and Technology, Smoluchowskiego 25, 50-370 Wrocław, Poland
https://orcid.org/0000-0003-3553-6107
F. Berto
Department of Industrial and Mechanical Design, Norwegian University of Science and Technology, Norway
http://orcid.org/0000-0002-4207-0109
A. Fernandez-Canteli
Department of Construction and Manufacturing Engineering, Univ. of Oviedo, 33203 Gijón, Spain
http://orcid.org/0000-0001-8071-9223
G. Glinka
Department of Mechanical Engineering, University of Waterloo, 200 Univ. Avenue West, Waterloo, ON, 2L 3G1, Canada
http://orcid.org/0000-0001-8452-8803
Abstract
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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