Proposal for a more accurate physically based S–N curve for welded steel joints

Lassen, Tom; Récho, Naman

doi:10.1016/j.ijfatigue.2008.03.032

Cited by 41 publications

(25 citation statements)

References 9 publications

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“…Several two-stage two-parameter models have been proposed involving an assumed crack transition size a t (e.g. Brandt et al 2001;Lassen et al 2005;Darcis et al 2006;Lassen and Recho 2009;Chattopadhyay et al 2011) based on different arguments: theoretical (e.g. fracture mechanics modelling restrictions), practical (e.g.…”

Section: Total Life Criteriamentioning

confidence: 99%

“…In case of a ρ = 0 assumption the SED rather than K f (K t ) can be adopted as well (Section 2.5; Chattopadhyay et al 2011). The material parameters including the intercept log(C i ) and slope m i are determined using smoot hour-glass shaped weld (root) material specimen in strain controlled tests (Brandt et al 2001) or material dependent empirical relations calibrated using welded joint S − N i fatigue test data covering the number of cycles up to the crack transition size a t (Lassen and Recho 2009;Chattopadhyay et al 2011). The mean stress σ m is obtained using cyclic stress-strain measurement data of the hourglass shaped specimens (Brandt et al 2001), welded joint fatigue resistance data with and without residual stress (Chattopadhyay et al 2011) or is simply assumed to be at yield magnitude because of the welding induced residual stress (Darcis et al 2006).…”

Section: Total Life Criteriamentioning

confidence: 99%

“…Cyclic mechanical loading turns K into a driving force ΔK, introducing the Paris equation (da/ dn) = C g '·(ΔK) mg in order to obtain the Basquin type of relation for the crack growth part: log(N g ) = log(C g ) − m g ·log{∫f (ΔK )da}. Typically standard crack growth specimens are used to acquire the intercept C g ' and the slope m g (Brandt et al 2001;Lassen et al 2005;Darcis et al 2006;Lassen and Recho 2009).…”

Section: Total Life Criteriamentioning

confidence: 99%

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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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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: Total Life Criteriamentioning

confidence: 99%

Section: Total Life Criteriamentioning

confidence: 99%

Section: Total Life Criteriamentioning

confidence: 99%

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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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“…A predicative model for fatigue degradation process is of decisive help for inspection planning (Lassen and Recho, 2009).Two distinctive models are S-N model and Fracture mechanics (FM) model. S-N model calculates fatigue damage based on Palmgren-Miner' rule together with S-N curves, while FM model predicts damage evolution in terms of crack propagation.…”

Section: Instructionsmentioning

confidence: 99%

“…Lassen and Recho (2009) propose a two phrase model to calculate fatigue life for filled steel welds where the crack initiation is treated by a local strain approach. Their model is physically sophisticated, but the transition point between crack initiation and propagation is not uniquely defined.…”

Section: Instructionsmentioning

confidence: 99%