Total Life Approach for Fatigue Life Estimation of Welded Structures

Mikheevskiy, S.; Glinka, G.; Cordes, T. S.

doi:10.1016/j.proeng.2015.02.023

Cited by 15 publications

(12 citation statements)

References 3 publications

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“…Moreover, the fatigue life calculated by Equation (8) is close to the actual fatigue life. In order to further validate the proposed model, the fatigue life calculated by Equation (8) was compared with the results calculated by several similar models, including the model in [23] (Equation (2)), the model in [26] (Equation (5)), and Equation 1 (three-parameter S-N model), respectively. The formula of the model proposed in [23] is as follows:…”

Section: Methods Of Validationmentioning

confidence: 99%

“…Comparisons of actual results and the calculations by Equation (8) (M1), the model in [23] (M2), the model in [26] (M3), and Equation (1) (M4), are shown in Figure 12. Figure 12a shows the fatigue life results of the samples V1 and V2, respectively, and Figure 12b shows the average relative errors between actual fatigue life and calculated fatigue life.…”

Section: Methods Of Validationmentioning

confidence: 99%

“…This is due to the following two reasons: First, the geometrical discontinuity caused by weld pores produces severe stress concentration around them, and results in a priority of crack initiation from weld pores. Second, weld pores are mainly located at the WZ where the crack initiation more likely occurs [23]. On the one hand, it can be seen from Figure 3 that the microhardness of WZ is higher than that of HAZ and BM, which means that there are higher strength and lower plasticity at the WZ.…”

Section: Location Of Crack Initiationmentioning

confidence: 96%

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Quantitative Analysis of Weld-Pore Size and Depth and Effect on Fatigue Life of Ti-6Al-2Zr-1Mo-1V Alloy Weldments

Zhang

Liu

Wang

et al. 2017

Metals

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Titanium-alloy weldments have been extensively used in engineering structures, and accurate estimation of the fatigue life is beneficial for avoiding catastrophic failures in titanium-alloy structures. The weld pore is a common defect in these weldments that significantly influences the fatigue process. In this study, the weld-pore size and depth and its effect on the fatigue life of Ti-6Al-2Zr-1Mo-1V (TA15) alloy weldments are investigated by adopting fatigue tests and fracture observations. The results show that fatigue crack initiations occurred at the weld pores for all specimens. The diameter and depth of all weld pores on fracture surfaces were then measured, and an indicator, P, was proposed, defined as a combination of pore diameter and depth. It was found that all the fatigue cracks initiated from the pore have the smallest P indicator, which suggests that P can be used to judge the location of crack initiation in an individual sample. Moreover, a model was developed based on P to estimate the fatigue life of weldments, considering the effects of weld-pore size and depth. Finally, analogous fatigue tests were carried out for model verification, and results show that the proposed model has a higher accuracy compared with several typical models. The findings of this study can be helpful in estimating the fatigue life and fatigue design of titanium-alloy weldments.

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Section: Methods Of Validationmentioning

confidence: 99%

Section: Methods Of Validationmentioning

confidence: 99%

Section: Location Of Crack Initiationmentioning

confidence: 96%

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Quantitative Analysis of Weld-Pore Size and Depth and Effect on Fatigue Life of Ti-6Al-2Zr-1Mo-1V Alloy Weldments

Zhang

Liu

Wang

et al. 2017

Metals

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“…It required using only one methodology, i.e., the fracture mechanics based fatigue crack growth analysis. It was also demonstrated that, the Total Life fatigue crack growth method can be used to estimate fatigue lives of smooth specimens that are deemed to be free of initial cracks in engineering sense [18].…”

Section: Mikheevskiya Et Al (2015) Proposed a Novel Methods Named Tomentioning

confidence: 99%

Corrosion Fatigue of Welded Joints in Marine and Naval Structures, A Review

Kumar¹

2017

IJMPERD

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“…Alternative to a one-stage one-parameter model (e.g. the cracked geometry parameter SIF K and the Paris relation using a defect size equal to the intact geometry material characteristic micro-and meso-structural length ρ * ; Noroozi et al 2005;Mikheevskiy et al 2015) or a two-stage two-parameter model, a two-stage one-parameter model like the total stress S T can be adopted as well. A natural transition from a growth governing to an initiation dominated life time is for example possible by introducing a loading & response level dependent elastoplasticity coefficient n (Section 2.9), changing the crack growth characteristic from non-monotonic to monotonically increasing.…”

Section: Total Life 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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Total Life Approach for Fatigue Life Estimation of Welded Structures

Cited by 15 publications

References 3 publications

Quantitative Analysis of Weld-Pore Size and Depth and Effect on Fatigue Life of Ti-6Al-2Zr-1Mo-1V Alloy Weldments

Quantitative Analysis of Weld-Pore Size and Depth and Effect on Fatigue Life of Ti-6Al-2Zr-1Mo-1V Alloy Weldments

Corrosion Fatigue of Welded Joints in Marine and Naval Structures, A Review

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

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