Local unified probabilistic model for fatigue crack initiation and propagation: Application to a notched geometry

Correia, José A.F.O.; Jesus, Abílio M.P. De; Fernández‐Canteli, Alfonso

doi:10.1016/j.engstruct.2013.03.009

Cited by 81 publications

(50 citation statements)

References 12 publications

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“…Description of the procedure he procedure proposed by Correia et al [1] to derive probabilistic S-N-R fields for notched structural details or mechanical components is based on the assumption that crack path is discretized into elementary material blocks of length ρ*, placed along the assumed crack path (see Fig. 1).…”

Section: General Procedures To Generate P-s-n-r Fields For Notched Detmentioning

confidence: 99%

“…Their application for design purposes requires additional safety margins defined with supplementary statistical arguments in order to allow the establishment of an appropriate safe design. In this paper, a probabilistic approach is applied to generate probabilistic S-N curves for notched details such as a notched plate (plate with circular hole) made of puddle iron from the Eiffel bridge, based on local strain fatigue approaches [1]. The plate with a circular hole is of interest since it shows similitudes with the riveted plates.…”

Section: Introductionmentioning

confidence: 99%

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Probabilistic fatigue S-N curves derivation for notched components

Raposo

Correia

Jesus

et al. 2017

Frattura Ed Integrità Strutturale

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ABSTRACT. Europe has a number of ancient riveted metallic bridges, constructed during the second half of the 19 th century up to the middle of the 20 th century, which are still in operation. In this paper, a unified approach is presented to generate probabilistic S-N curves to be applied to structural components, accounting for uncertainties in material properties. The approach is particularly demonstrated for a plate with a circular hole, made of puddle iron from the Portuguese Eiffel Bridge. This paper presents an extension of the local strain-based fatigue crack propagation model proposed by Noroozi et al. The latter model is applied to derive the probabilistic fatigue crack propagation field (p-S-Np field). The probabilistic fatigue crack initiation field (p-S-N i field) is determined using a notch elastoplastic approach, to calculate the fatigue failure of the first elementary material block ahead of the notch root.

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Section: General Procedures To Generate P-s-n-r Fields For Notched Detmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Probabilistic fatigue S-N curves derivation for notched components

Raposo

Correia

Jesus

et al. 2017

Frattura Ed Integrità Strutturale

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“…This two-stage approach has been used by de Jesus et al 1 for the fatigue assessment of riveted and bolted joints. A probabilistic version of the two-stage approach has been applied for a notched geometry by Correia et al 2 Promising steps are continually being made in the direction of a unified model for material fatigue, such as the work of Liu et al, 3 utilizing damage mechanics to describe the damage accumulation process. Kim et al 4 developed a fatigue model using a cycledependent cohesive zone law, where the reduction of fracture energy and degradation of stiffness describe the material fatigue.…”

Section: Introductionmentioning

confidence: 99%

“…They have been successfully applied for the assessment of crack initiation, 14,29 propagation, [30][31][32][33] and twostage total life analysis. 2,34 The aim of this study is to model the crack initiation and propagation process in a notched plate specimen from the experiments of Bjo¨rkblad. 35 Crack initiation life is calculated with the Coffin-Manson relationship, whereas nonlinear finite element analysis (FEA) and the unified notch rule (UNR) from Meggiolaro et al 36 are applied for local strain computation.…”

Section: Introductionmentioning

confidence: 99%

Total fatigue life analysis of a nodular cast iron plate specimen with a center notch

Gróza

Váradi

2017

Advances in Mechanical Engineering

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The crack initiation and propagation phases of the fatigue life of a plate specimen with a center hole are analyzed. The local transient stress-strain relationship is investigated by means of finite element simulations with a nonlinear kinematic hardening model. Modifications are proposed for the conventional notch analysis with the strain-life methodology considering the effect of mean stress relaxation and strain ratchetting. With the proposed modifications, the crack initiation life at the notch is less dependent on the load ratio, as it is in classic analysis methods. The initiated cracks are further investigated with fracture mechanics methods to evaluate total fatigue life. The eXtended finite element method and analytical formulas are applied to obtain the crack path and stress intensity factors, the results of which are in excellent agreement. Propagation life is estimated with the NASGRO crack-growth model fitted on the experimental results.

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“…2 However, in the current integrity assessment methods based on the macro-fracture mechanics, standard specimen for the fracture toughness testing has severely size requirement to make sure a high constraint state. [3][4][5][6][7][8] For the flawed structure involves a low constraint state, the transfer of fracture toughness data from standard specimen to actual cracked components will produce a conservative result. Conversely, for some special cases with higher constraint states than standard specimen, the transfer will result in a non-conservative (unsafe) result.…”

Section: Introductionmentioning

confidence: 99%

The matching of crack-tip constraint between standard and non-standard specimen

Yang

2018

Advances in Mechanical Engineering

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The matching of crack-tip constraint is a key issue for the developing of accurately structure integrity assessment method. For more and more non-standard specimens with different constraint states were used in the scientific research, it is especially significant to establish the matching of constraint between standard specimen and non-standard specimen. In this article, the single edge-notched bend specimens with various constraint states were selected, and the unified constraint parameter A p under different J-integrals was calculated by finite element analysis. And then, based on the J-A p curves, the matching of crack-tip constraint between different specimens was studied, and the matching specimens were given. In order to confirm the reliability of results, some experiments focused on the matching specimens were performed. The experiment results showed that the matching is valid. For the fracture properties of matching specimens are matching also, it is significant to the accurate assessment of structural integrity.

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Local unified probabilistic model for fatigue crack initiation and propagation: Application to a notched geometry

Cited by 81 publications

References 12 publications

Probabilistic fatigue S-N curves derivation for notched components

Probabilistic fatigue S-N curves derivation for notched components

Total fatigue life analysis of a nodular cast iron plate specimen with a center notch

The matching of crack-tip constraint between standard and non-standard specimen

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