A new path-dependent fatigue damage model for non-proportional multi-axial loading

Mei, Jifa; Dong, Ping

doi:10.1016/j.ijfatigue.2016.05.010

Cited by 60 publications

(26 citation statements)

References 31 publications

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“…[6], based on the rotation of the principal strain directions, was used to analyse the severity of each nonproportional loading. The second method, developed by Mei and Dong, [13], based on the accumulative Moment of Load Path (MLP) concept was applied for analysing the dimensionless non-proportionality induced damage factor, gNP.…”

Section: Methodsmentioning

confidence: 99%

“…The non-proportional hardening may be related to stacking faults and dislocation structures, which have different forms produced by different loading paths, [12]. A new non-proportionality damage factor based on accumulative path length traversed within half cycle is proposed in [13] and [14]. This factor can vary from zero for proportional load to 1 for a semi-circular load.…”

Section: Introductionmentioning

confidence: 99%

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New research findings on non-proportional low cycle fatigue

Cernescu

Pullin

2019

MATEC Web Conf.

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One of the challenges regarding multiaxial fatigue damage predictions is non-proportional loading. Relevant studies have shown that these multiaxial loadings cause significant additional hardening and reduction in durability due to non-proportionality. Fatigue life predictions due to non-proportional loadings are based on an equivalent nonproportional strain range that considers a material constant related to additional hardening and a non-proportionality factor. In this paper an analysis of the non-proportional factor for three multiaxial loadings forming a square in γ/√3 -ε coordinates is carried out. One of the observations revealed by this analysis is the sensitivity of the non-proportional factor to variable shear strain rate.1

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New research findings on non-proportional low cycle fatigue

Cernescu

Pullin

2019

MATEC Web Conf.

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“…Although local (notch) information is involved, the loading & response conditions are far field (fracture plane) defined meaning multiaxiality is limited to mixed mode-I and mode-III cases and hot spot structural stress criterion developments like multi-axial cycle counting in the Von Mises plane (e.g. Dong et al 2010;Wei and Dong 2011;Mei and Dong 2016) can be applied. However, endurance is incorporated only and counting in the S B −T B rather than σ s −τ s plane has been proposed (Hong and Forte 2014), involving the mechanism (i.e.…”

Section: Battelle Structural Stress Criterionmentioning

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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“…The Path-Dependent-Maximum-Range (PDMR) method accounts for complex load histories (i.e. variable amplitude, nonproportional) in stress space (σ s − √ βτ s ), by consideration of the maximum stress range and the load path corresponding to this range [36,85,135].…”

Section: Path-dependent-maximum Range (Pdmr) Cycle Countingmentioning

confidence: 99%

Multiaxial fatigue assessment of welded joints in marine structures

Lieshout

Besten

Kaminski

2018

ISP

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Structural geometry and stochastic loads such as swell and wind seas can typically induce multiaxial stress states in welded details of marine structures. It is known that such complex time varying stress states determine the fatigue resistance of welded steel joints. Therefore, it is of importance to account for them in fatigue lifetime estimation. Over the past few decades a wide variety of design guidelines and methods have been developed for multiaxial fatigue assessment, but so far there does not exist a general hypothesis applicable to all possible load cases. This study provides an overview of the current state-ofthe-art in academia and engineering practice in terms of multiaxial fatigue assessment, and is focusing on the application to welded joints in marine structures. The progress of different approaches and methods is elaborated and commented upon, taking their hypothesis and (physical) basis into consideration. The insights that are provided in this paper form a valuable foundation for future investigations and emphasize the necessity of experimental proofs and model validation.

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A new path-dependent fatigue damage model for non-proportional multi-axial loading

Cited by 60 publications

References 31 publications

New research findings on non-proportional low cycle fatigue

New research findings on non-proportional low cycle fatigue

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

Multiaxial fatigue assessment of welded joints in marine structures

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