The new IIW recommendations for fatigue assessment of welded joints and components – A comprehensive code recently updated

Hobbacher, A. F.

doi:10.1016/j.ijfatigue.2008.04.002

Cited by 204 publications

(132 citation statements)

References 10 publications

Supporting

Mentioning

118

Contrasting

Unclassified

Order By: Relevance

“…This minimum factor of the improvement effect is established for each of the considered techniques and can be used without any complementary experiments. For the TIG dressing, the improvement is given by a factor in terms of stress [23][24][25]. The update of the Recommended Practice for Fatigue Design of Offshore Steel Structures also considers the improvement techniques of grinding, TIG dressing and hammer peening [26].…”

Section: Introductionmentioning

confidence: 99%

Fatigue behaviour of T welded joints rehabilitated by tungsten inert gas and plasma dressing

Ramalho

Ferreira

Branco³

2011

Materials & Design

View full text Add to dashboard Cite

This paper concerns a fatigue study on the effect of tungsten inert gas (TIG) and plasma dressing in non-load-carrying fillet welds of structural steel with medium strength. The fatigue tests were performed in three point bending at the main plate under constant amplitude loading, with a stress ratio of R=0.05 and a frequency of 7 Hz.Fatigue results are presented in the form of nominal stress range versus fatigue life (S-N) curves obtained from the as welded joints and the TIG dressing joints at the welded toe. These results were compared with the ones obtained in repaired joints, where TIG and plasma dressing were applied at the welded toes, containing fatigue cracks with a depth of 3-5 mm in the main plate and through the plate thickness. A deficient repair was obtained by TIG dressing, caused by the excessive depth of the crack. A reasonable fatigue life benefits were obtained with plasma dressing. Good results were obtained with the TIG dressing technique for specimens with shallower initial defects (depth lesser than 2.5 mm).The fatigue life benefits were presented in terms of a gain parameter assessed using both experimental data and life predictions based on the fatigue crack propagation law.

show abstract

Section: Introductionmentioning

confidence: 99%

Fatigue behaviour of T welded joints rehabilitated by tungsten inert gas and plasma dressing

Ramalho

Ferreira

Branco³

2011

Materials & Design

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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...

show abstract

“…For this purpose curves constructed according to normative guidelines [2] or those formulated by classification societies [3,4], for instance, are used. Specimen fatigue curves for different categories of welded joints, taken from [4], are shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Specimen fatigue curves for different categories of welded joints, taken from [4], are shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Comparing Guidelines Concerning Construction of the S-N Curve within Limited Fatigue Life Range

Strzelecki

Sempruch

Nowicki

2015

Polish Maritime Research

View full text Add to dashboard Cite

The article collates guidelines concerning experimental construction of the S-N fatigue curves within a limited fatigue life range. An attempt is made to compare these guidelines, based on experimental data recorded during rotating bending of a notched specimen made of 42CrMo4. The recorded differences in fatigue life values between the constructed curves reach the maximum of 12.2%. According to the above guidelines, the number of tests in particular test series varies from 6 to 28. Based on the performed analysis a conclusion was made that the increase in the number of tests leads to the increase of accuracy but, on the other hand, remarkably increases the time of the experiment and

show abstract

The new IIW recommendations for fatigue assessment of welded joints and components – A comprehensive code recently updated

Cited by 204 publications

References 10 publications

Fatigue behaviour of T welded joints rehabilitated by tungsten inert gas and plasma dressing

Fatigue behaviour of T welded joints rehabilitated by tungsten inert gas and plasma dressing

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

Comparing Guidelines Concerning Construction of the S-N Curve within Limited Fatigue Life Range

Contact Info

Product

Resources

About