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.
Highlights
Fatigue crack initiation, usually modelled by strain-life or stress-life, has traditionally been considered to be a separate physical phenomenon from fatigue crack propagation
Correia et al [9,17,18] proposed a procedure to derive probabilistic S–N–R fields for notched structural details or mechanical components, which is based on the UniGrow model and numerical analysis aiming at computing the elastoplastic stresses and strains at process zone ahead the crack tip
Analytical methods such as the ones proposed by Neuber [19] and Moftakhar et al [20] may be applied to perform the elastoplastic analysis taking into account the elastic stress/strain fields computed around the crack tip, using available Linear Elastic Fracture Mechanics solutions [4,20,21]
Summary
Usually modelled by strain-life or stress-life, has traditionally been considered to be a separate physical phenomenon from fatigue crack propagation. This new fatigue crack propagation model was proposed by Huffman based on Walkerlike strain-life relation. Fatigue Crack Growth; Strain Energy; Unigrow Model; Pressure Vessel Steel.
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