Assessment of welded structures by a structural multiaxial fatigue approach

Van, K. Dang; Bignonnet, A.; Fayard, Jean-Luc

doi:10.1016/s1566-1369(03)80002-x

Cited by 16 publications

(8 citation statements)

References 8 publications

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“…However, their applicability is limited to non-proportional loads, and they rely on cycle-counting algorithms such as rainflow counting [2], with fatigue damage accumulation based on the Palmgren-Miner rule. Another stress-based approach is the critical plane criterion [14,15], which assumes that the most heavily loaded material plane is critical for fatigue development.…”

Section: High-cycle Fatigue (Hcf)mentioning

confidence: 99%

Developments of Topology Optimization Methods for Additive Manufacturing involving High-cycle Fatigue

Suresh

2023

Linköping Studies in Science and Technology. Dissertations

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This Doctoral thesis builds upon the research conducted in my Licentiate thesis [45], and was carried out at the division of Solid Mechanics in Linköping University. The work was performed within the Centre for Additive Manufacturing-Metal (CAM 2 ), which was funded by Sweden's Innovation Agency through grant agreement No 2016-05175.I wish to extend my heartfelt appreciation to my primary supervisor, Professor Anders Klarbring and my co-supervisors, Dr. Stefan Lindström, Dr. Carl-Johan Thore, and Dr. Bo Torstenfelt, for their unwavering support, guidance, and expertise throughout this project. Their invaluable feedback, encouragement, and patience were instrumental in my research and writing process.Additionally, I am grateful to all my colleagues at Linköping University for their support and engaging conversations, both related to work and other topics.Finally, I am deeply grateful to my family, my lovely wife Priya and our daughter Rithu, for all their unconditional support and sacrifices they have made for my life in general.

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Section: High-cycle Fatigue (Hcf)mentioning

confidence: 99%

Developments of Topology Optimization Methods for Additive Manufacturing involving High-cycle Fatigue

Suresh

2023

Linköping Studies in Science and Technology. Dissertations

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“…Dang Van et al 2001) explicitly incorporating the residual stress, although even in the HCF region the fatigue life times are micro-crack growth rather than nucleation dominated. The framework still has to be generalised to incorporate notch effectivity; i.e.…”

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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“…The local residual stresses are a three-dimensional stress state with different principal directions. 33 The negative tensile residual stress is a result of volume shrinkage during phase transformation. 34 The compressive residual stresses increase the fatigue strength, including the prevention of fatigue crack initiation and propagation.…”

Section: Introductionmentioning

confidence: 99%

Nonlocal approach to fatigue analysis of a welded bicycle frame joint

Tomaszewski

2023

Fatigue Fract Eng Mat Struct

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The paper attempts to predict the probabilistic fatigue strength scatter bands of a welded bicycle frame joint. The experimental data of the base material and the weld material were approximated by a nonlinear probabilistic model of the Weibull distribution. The fatigue strength for the material at the fatigue crack location was estimated considering the mean stress, residual stress, fatigue notch factor, and hardness profile. The output finite element numerical data of the real welded joint were compared with a nonlocal multiaxial fatigue criterion. The implementation of the volumetric method takes into account the stress gradient effect in the three‐dimensional geometry of the weld toe. The comparative localization of the minimum stress and the real crack indicates the validity of the numerical model. The predicted fatigue strength determines the possible failure of a welded joint at 5·105 cycles.

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Assessment of welded structures by a structural multiaxial fatigue approach

Cited by 16 publications

References 8 publications

Developments of Topology Optimization Methods for Additive Manufacturing involving High-cycle Fatigue

Developments of Topology Optimization Methods for Additive Manufacturing involving High-cycle Fatigue

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

Nonlocal approach to fatigue analysis of a welded bicycle frame joint

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