An investigation of bending fatigue crack propagation in structural steel by the measurement of indirect parameters

Figueiredo, Ana Maria Gontijo; Ribeiro, Gabriel de Oliveira; Dias, José Felipe; Modenesi, Paulo José; Queiroz, Felipe Leonardo Pereira; Vasconcelos, Juliana de Oliveira; Monteiro, Humberto Alves da Silveira

doi:10.1007/s40430-014-0149-8

Cited by 3 publications

(1 citation statement)

References 4 publications

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“…This issue constitutes a significant knowledge gap in the understanding of the pit-to-fatigue crack transition process. Understanding the mechanism involved in this transition and the initial development of the crack has potential to improve the prediction of fatigue life [25]. In reviewing the literature, it became apparent that no previous work was performed on finite element analysis (FEA) of corrosion pits under the cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

Fatigue behaviour of corrosion pits in X65 steel pipelines

Farhad

Zhang

Smyth-Boyle

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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Corrosion pits are a form of geometrical discontinuity that lead to stress and strain concentration in engineering components, resulting in crack initiation under service loading conditions and ultimately fracture and failure. Initiation and propagation of cracks in offshore pipelines can lead to loss of containment and environmental and commercial impacts. In order to prevent such failures, tools to predict the structural integrity of pipelines need to be improved. This work investigates the fatigue behaviour of corrosion pits in API-5L X65 grade steel pipeline utilising numerical and analytical methods. Firstly, load-controlled fatigue tests were carried out on smooth X65 steel samples to establish S–N data. Secondly, local stress–strain behaviour at corrosion pits and its effect on fatigue crack initiation were investigated using elastic-plastic finite element analysis of samples containing a single corrosion pit under cyclic loading. Analysis of stabilised stress–strain hysteresis loops at corrosion pits showed that the local stress ratio at the pit changes from 0.1 to −0.4 while the applied stress amplitude increases with the same stress ratio of 0.1. Analytical methods were also used to predict the local maximum stress and strain at the pit, which showed a similar local stress ratio to the finite element analysis result but lower stress and strain ranges. Finally, fatigue crack initiation life was predicted using the combination of finite element stress and strain analysis and the Smith–Watson–Topper strain–life approach. An advantage of this method for life estimation is that this approach considers the local stress and strains at corrosion pits rather than applied stress.

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Section: Introductionmentioning

confidence: 99%

Fatigue behaviour of corrosion pits in X65 steel pipelines

Farhad

Zhang

Smyth-Boyle

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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An Entropy Approach for Characterization and Assessment of Fatigue Damage Accumulation in Q235 Steel Based on Acoustic Emission Testing

Jia

2019

Springer Proceedings in Physics

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A New Prediction Approach for the Structural Fatigue Life Based on Multi-Factor Correction

2018

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As the phenomenon of fatigue damage is a common failure mode of equipment, the reliability evaluation and life prediction have become a hot-spot. The precise prediction of fatigue life in the initiation stage has become necessary. The common prediction study for structural fatigue life takes less influence factors into consideration. The common prediction results of fatigue life cannot be quantitatively corrected by the influence factors at the same time. This paper presents a research on the prediction approach for structural fatigue life based on the multi-factor correction. The influence of some factors on the fatigue life was analyzed and the prediction approach for structural fatigue life based on multi-factor correction was raised. Then the fatigue life of axle housing was predicted by using the corrected approach, as the case study. Moreover, the result predicted by the local stress–strain approach and the experimental data were used to verify the accuracy of the corrected approach. It can be clearly demonstrated by the results that the corrected prediction approach can be used to achieve the precision fatigue life for engineering structures. Further, it is also a prediction approach endowed with engineering application prospects.

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An investigation of bending fatigue crack propagation in structural steel by the measurement of indirect parameters

Cited by 3 publications

References 4 publications

Fatigue behaviour of corrosion pits in X65 steel pipelines

Fatigue behaviour of corrosion pits in X65 steel pipelines

An Entropy Approach for Characterization and Assessment of Fatigue Damage Accumulation in Q235 Steel Based on Acoustic Emission Testing

A New Prediction Approach for the Structural Fatigue Life Based on Multi-Factor Correction

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