Multi-scale modeling of fatigue crack propagation applied to random sequence of clustered loading

Sumi, Yôichi; Inoue, T.

doi:10.1016/j.marstruc.2011.02.003

Cited by 18 publications

(4 citation statements)

References 16 publications

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“…However, the existing research on surface crack growth has mainly focused on a single load condition or combined loading cases with the same frequency simultaneously applied on the pipe structure. The research on fatigue crack growth under random loading has mainly been conducted on compact tension (CT) specimens [73,74], and related research on random loading on surface cracked pipes has not been included in the open documents yet.…”

Section: Configurations Of Surface Cracks and Pipesmentioning

confidence: 99%

Surface Crack Growth in Offshore Metallic Pipes under Cyclic Loads: A Literature Review

Jiang

Hopman

2020

JMSE

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The surface crack, also known as the partly through-thickness crack, is a serious threat to the structural integrity of offshore metallic pipes. In this paper, we review the research progress in regard to surface crack growth in metallic pipes subjected to cyclic loads from the fracture mechanics perspective. The purpose is to provide state-of-the-art investigations, as well as indicate the remaining challenges. First, the available studies on surface cracked metallic pipes are overviewed from experimental, numerical, and analytical perspectives, respectively. Then, we analyse state-of-the-art research and discuss the insufficiencies of the available literature from different perspectives, such as surface cracks and pipe configurations, environmental influential parameters, the girth welding effect, and numerical and analytical evaluation methods. Building on these surveys and discussions, we identify various remaining challenges and possible further research topics that are anticipated to be of significant value both for academics and practitioners.

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Section: Configurations Of Surface Cracks and Pipesmentioning

confidence: 99%

Surface Crack Growth in Offshore Metallic Pipes under Cyclic Loads: A Literature Review

Jiang

Hopman

2020

JMSE

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“…Local crack growth simulations can be embedded in global marine structural loading & response models in order to cover a range of scales (Sumi and Inoue 2011). Alternatively discontinuum and continuum damage mechanics might be used and correlated to model multi-scale fatigue, including two-scale micro-meso continuum formulations (e.g.…”

Section: Multi-scale Criteriamentioning

confidence: 99%

Fatigue damage criteria classification, modelling developments and trends for welded joints in marine structures

Besten

2018

Ships and Offshore Structures

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Fatigue is typically a governing limit state for marine structures. Welded joints are the weakest links in that respect. Physics involve several resistance dimensions, a range of scales and distinct contributions in different stages of the accumulative damage process. Fatigue damage criteria developed over time have been classified with respect to type of information, geometry, parameter and process zone including plane and life region annotations. The criteria are evaluated regarding model (in)capabilities, showing up to what extent (governing) physics are taken into account. Modelling developments and trends towards complete strength, multi-scale and total life criteria have been identified. Incorporating all four (interacting) fatigue resistance dimensions: material, geometry, loading & response and environment translates into a complete strength fatigue damage criterion. Considering macro-, meso-and micro-scale information provides a multi-scale fatigue damage criterion. Correlation of crack initiation and growth requires matching intact and cracked geometry parameters, revealing a total life fatigue damage criterion. HIGHLIGHTS• Classification of fatigue damage criteria with respect to type of information, geometry, parameter and process zone including plane and life region annotations.• Identification of modelling developments and trends towards complete strength, multi-scale and total life fatigue damage criteria for welded joints in marine structures. NomenclatureA notch strain energy density process zone area C crack growth or fatigue resistance curve intercept (endurance coefficient) D fatigue damage E normal strain at macro-scale E Young's modulus J crack tip energy density J 1 hydrostatic stress or strain component J 2 deviatoric stress or strain component K σ crack tip stress intensity factor K ɛ crack tip strain intensity factor K' work hardening coefficient K N notch stress intensity factor K N I mode-I notch stress intensity factor K N III mode-III notch stress intensity factor K I mode-I stress intensity factor K I T total mode-I stress intensity factor K I r residual mode-I stress intensity factor K III mode-III stress intensity factor K * FE dimensionless FE based notch stress intensity factor N (total) number of cycles until failure N i number of cycles corresponding to initiation N g number of cycles corresponding to growth R notch strain energy density process zone radius S stress based fatigue damage criterion S B Battelle structural normal stress range S e effective notch stress range S eq (equivalent) Von Mises stress range S n nominal stress range S s hot spot structural stress range S T total stress range T temperature T B Battelle structural shear stress range T σS strength scatter band index W energy based fatigue damage criterion W N notch strain energy W N A notch strain energy density Y n notch factor Y f far field factor a crack size (i.e. length) a 0 critical defect size a d long-term corrosion pit size (i.e. depth) a i (real) defect or initial crack size a n (root) not...

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“…In this method, which is the simplest model for estimating the fatigue life under random loading, the root mean square values of the maximum and minimum stresses of the specimen are calculated and then, the Forman equation is used to estimate the fatigue life. Sumi and Inoue (2011) and Li et al (2015) analyzed the FCG under random loading in marine structures. In their studies, they used numerical and test methods and examined the effect of loading sequence on the specimen.…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack growth reliability analysis under random loading

Salari

2019

IJSI

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Purpose The purpose of this paper is to investigate the fatigue crack growth (FCG) under random loading using analytical methods. Design/methodology/approach For this purpose, two methods of cycle-by-cycle technique and central limit theorem (CLT) were used. The Walker equation was used to consider the stress ratio effect on the FCG rate. In order to validate the results in three random loading group with different loading levels and bandwidths, the results of the analysis, such as the mean lifetime of the specimen and the average crack length were compared with the test results in terms of the number of loading cycles. Findings The comparison indicated a good agreement between the results of the analysis and the test. Further, the diagrams of reliability and the probability of failure of the specimen were obtained for each loading group and were compared together. Originality/value Applying the cycle-by-cycle and CLT methods for the calculation of fatigue reliability of a CT specimen under random loading by the Walker equation and comparing their results with each other is not observed in other researches. Also in this study, the effect of the loading frequency bandwidth on lifetime was studied.

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Multi-scale modeling of fatigue crack propagation applied to random sequence of clustered loading

Cited by 18 publications

References 16 publications

Surface Crack Growth in Offshore Metallic Pipes under Cyclic Loads: A Literature Review

Surface Crack Growth in Offshore Metallic Pipes under Cyclic Loads: A Literature Review

Fatigue damage criteria classification, modelling developments and trends for welded joints in marine structures

Fatigue crack growth reliability analysis under random loading

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