Fatigue analysis of welded joints: state of development

Fricke, Wolfgang

doi:10.1016/s0951-8339(02)00075-8

Cited by 231 publications

(135 citation statements)

References 62 publications

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“…Different fatigue assessment concepts, damage criteria and corresponding resistance curves, have been developed and reviewed over time to account for endurance and mechanism contributions (Cui 2002;Fricke 2003;Maddox 2003;Radaj et al 2006;Hobbacher 2009;Rizzo 2011;Radaj and Vormwald 2013;Radaj 2014Radaj , 2015Fricke 2015;Hobbacher 2016;Lotsberg 2016). The criteria are proposed to be classified as (Figure 4):…”

Section: Fatigue Damage Criteria Classificationmentioning

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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Section: Fatigue Damage Criteria Classificationmentioning

confidence: 99%

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

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2018

Ships and Offshore Structures

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“…Hereby, the Kolmogorov-Smirnov testing method [13] was applied in order to evaluate the fitting effectively.…”

Section: Parameters Estimation and Testing For The Pdf Of Fatigue Stressmentioning

confidence: 99%

“…The increment of the relative fatigue damage can be obtained by statistical analysis of the daily equivalent stress amplitudes and the corresponding cycle times during a time period [13], which is a half year in this research. According to the detailed fatigue residence classifications specified in the ship structural profiles and the relevant welding procedure diagrams, the welds nearby the strain sensor 7 are thus classified as F2.…”

Section: The Statistical Analysis Of the Increment Of The Relative Famentioning

confidence: 99%

Parameters Estimation and Evaluation for the Probability Density Function of Structural Fatigue Stress of a Container Vessel

Feng¹

2017

JSOE

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Fatigue stress measurement has been playing a significant role in the ship structural health monitoring and ship structural safety assessment. The PDF (probability density function) of the measured stress is one of the essentials for the further studyin this domain. This paper, based on the strain-stress data collected from a container ship, focuses on the spectrum feature of the ship structural fatigue stress. A general analysis procedure for ship hull health estimation was firstly demonstrated. With the guidance of this procedure, the estimation and test of the parameters for the PDF of the stress were conducted, which showed that the stress spectrums fit well with the Weibull distribution. To review the fatigue state, the PDF and distribution function of fatigue damage increment were further developed and examined. The structural healthy assessment of this vessel shown the daily relative fatigue damage increment obeys log-normal or Weibull distribution and the increment of the fatigue damage on steel box girders of the ship hull was very low. Finally, the analyzing results yielded that the girder structure of the ship hull had a very low failure probability, matching well with the actual relative low working load of the ship.

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“…The former is caused by alternating stresses, particularly the amplitudes of the alternating stresses, and the breakage is a gradual accumulation process. However, the latter is induced by an amplitude with an extreme value, which causes a sudden destruction (Mao, 2009;Fricke, 2003;Sarkani et al, 2001). …”

Section: Introductionmentioning

confidence: 99%